bluuebunny/crossref_metadata_2025 huggingface dataset:
Evaluation on Aerodynamic Across-Wind Response for a Tall Building Using Tuned Liquid Column Damper
Authors: You Jang Youl , You Ki Pyo , Kim Young Moon
Published: April 2014

Tuned liquid column damper (TLCD) is more advantageous in terms of space than TLD so that it is far more advantageous when it comes to installation on the actual building. To investigate the effectiveness of a tuned liquid column damper (TLCD) in mitigation wind-induced excitation motion of a tall building, aeroelastic experiments were conducted. A 1: 200 scaled model of an aeroelastic tall building was built, and TLCD models of mass ratio of 1.5% and 3%, respectively, were designed and tested with the aeroelastic model. As such, this study has installed TLCD with different lengths of horizontal pipes at the top most floor of realistic model. This is similar to the actual structure, centred on the interval where the vortex-induced vibration of low wind speed occurs, by conducting aeroelastic model tests in suburban areas and the vibration response in across-wind direction shall be found in order to figure out the wind vibration control effect according to various types (horizontal length, mass ratio) changes.
Finite Element Software for Optimization of Triangular Light Roof Truss Structure of Gymnasium
Authors: Li Tian , Wang Hong
Published: April 2014

As the landmark building of whole city,the gymnasium represents the image of the city.The gymnasium must be clean,concise and grand in extrinsic feature.The gymnasium must also be stable,safety and deal with accidents.Building gymnasium no only is according to the appearance and safety,but also considers efficiency and cost in this era in which technology is developing very rapdily.Excess resources and large volume will lead to wasting material and time.For saving labor and resources, ANSYS is applied to optimize the size of I beams which are used to build the triangular light roof of gymnasium in this paper. According to the optimization results,the weight of structure is optimal when size of I beams are 150×150,stress of structure is in the safety margin at the same time.
Cost/Schedule Monitoring and Forecasting for Project Based on Earned Value Management (EVM)
Authors: Huang Jian Wen , Pan Hui Min , Li Yan , Zhu Yi Ting , Liao Zai Yi
Published: April 2014

Earned value management (EVM) is one of the most widely used control tools in project management. It is a well-known management system that integrates cost, schedule and performance. Based on the traditional concept of EVM, the cost/schedule monitoring and forecasting model is proposed in this paper. It gives us the analysis steps and provides the methods for monitoring the actual situation and forecasting the final cost and duration. By using this model, the managers are able to know timely the status of a project in terms of budget and schedule and forecast the developing trend and ultimate outcome of the project. So it is a reliable method to improve the capability of project managers for making reasonable decisions.
Geometric Nonlinear Shallow Shells for Variable Thickness Investigation
Authors: Stupishin Leonid , Kolesnikov Alexander G.
Published: April 2014

Shallow shells with variable thickness based on rectangular plan are considered. Middle surface of shells has variable form and depends on the high of supporting arches, the boundary conditions, and the thickness. Critical force coefficient and stresses of variable form shells are investigated by Bubnov-Galerkin method. The calculation method has done by the Maple program complex.
Economic Life Prediction of Concrete Structure
Authors: Manganelli Benedetto
Published: April 2014

The decision to perform an extraordinary maintenance or a seismic retrofit of existing RC buildings should be based on rational criteria, which lead into account a number of factors that are able to define the cost-effectiveness of the investment. Among them the age of the concrete structure and its normal depreciation are key. The paper proposes value-time functions for the two main depreciation factors: age, and income decay. Empirical formulas have been developed to estimate the economic life of concrete structure on the basis of analysis of these depreciation functions.
Evaluation on the Development of Shanghai Suburban Infrastructure Based on AHP-Entropy Method
Authors: Xu Qi Sheng , Shi Jian Gang , Zhang Yong Gang
Published: April 2014

Infrastructure construction plays an important role in socio-economic development and urbanization level promotion. For the development of suburban infrastructure in Shanghai, the paper establishes the system of evaluation index and introduces the fuzzy comprehensive evaluation method. To make up for the insufficient of identification ability for determining the index weight by the AHP, the article uses the entropy method to make the results objective, scientific and reasonable.
Matrix Method Application on the Civil Engineering Project Management
Authors: Chang Hong
Published: April 2014

This document introduces and demonstrates the application of the risk matrix method on the engineering project risk management. The engineering project life cycle, risk categories, each risk management and the influence of the risk are considered in the project risk management, risk matrix suitable for the engineering project is established. A case is given to explain the application of the matrix method.
New Ideas to Resolve Construction GFA Specification
Authors: Yang Hai Ping
Published: April 2014

The calculation of Construction area is the basic work of engineering measurement, and has great significance in engineering construction. According to the definition of construction area, Through in-depth analysis the standards of building construction area, and find out the characteristics and relations, Summarizes the main features. Made summary on the building envelope and no-envelope, Design using and no-using etc, it speed up the memory of building construction area calculation rules, Simplify the calculation of construction area and Cost Professional Exams.
Research on Construction Safety Management of High-Rise Buildings Based on the Grey Hierarchy Evaluation Model
Authors: Tian Hong Wei
Published: April 2014

Based on the principle of “4M1E” in management, the article first built a reasonable evaluation index system of construction safety management of high-rise buildings, and then put forward a grey hierarchy evaluation model using the combination of the AHP method and the grey appraisal theory. The results of case verification show that this method can assign the importance priority sequence of safety management measures, and reduce the subjectivity of evaluation, which is significant for the improvement of safety level in the future.
Analysis of Sports Architecture Technical Philosophy Characteristics
Authors: Chen Xiao Jie
Published: April 2014

The tide of information era, a great impact and new opportunities is the development of sports buildings. This is mainly reflected in the high technology into the sports architecture field, the application of this information technology makes the development of sports buildings pointing in the direction of intelligent. Twenty-first Centuries is the digital age, the further application of digital technology will make the physical space, construction equipment, construction methods produce tremendous change, and the formation of a new design concept. We can foresee information technology revolution for the influence of sports buildings will influence than any one wave of more rapid and far-reaching. A variety of technical means to industrial society brought about by the leap, making people from the conquest of nature, the consumption of natural environment view. It also brought a series of significant environmental and development issues, forcing the view of environment is re evaluating and understanding. The introduction of a harmony with nature, symbiosis, sustainable development of philosophy of technology, should become the important characteristics of sports architectural design.
Application of Jiangxi Ancient Buildings Carved Window Shape in the Contemporary Design
Authors: Yao Jin Gui , Wu Lang
Published: April 2014

with the continuous innovation of contemporary art, more and more inspiration from the traditional meaning, while the Jiangxi ancient buildings carved window forms, modeling language is unique. This paper studied the application of contemporary design modeling language features in advertising, packaging, logo, fonts and other aspects of the premise, in the profound interpretation of these traditional modeling language, to the traditional modeling language combined with contemporary art and design perfect, realize the extraction from the art of carving shows the traditional window in Jiangxi ancient buildings and sublimation of evolution, the innovation of contemporary design in order to achieve the purpose.
Study of Structural Morphological Design during the Stage of Architecture Composition
Authors: Xu Wei Qi , Guo Qiu Run , Tong Hai Jin
Published: April 2014

Structural morphological design makes a breakthrough at traditional concept that structural is regarded only as the technological means in architecture composition.Starting from the concrete and abstract cognition on the structural morphological design,this paper analyses the influence of structure technology on architectural forms,discusses its application principle and the main distinction of the traditional structure design.By exploring the mechanics laws with typical cases,the paper summarizes the structural expression method and propounds new ideas for architectural form with structural morphology, in order to enlighten the thoughts of innovative application on structural morphological design in architectural creation.
The Humane Care Implied in Chinese Architectural Aesthetics
Authors: Liu Xiang
Published: April 2014

Development of Chinese architecture has gone through thousands of years of history, all ethnic groups according to their own cultural environment, religion, aesthetic sense, formed different styles of building systems and spatial pattern during the long years. We can feel the humane care and life rhythm implied of the building through these different shapes, like spatial distribution, environmental design and the use of material. This article main to analysis and study the beauty of humanity which embodied and used in buildings from the aspect of building space, the environment, materials, etc. By analyzing this, we can defined the humane care of architectural concept.
Sports Architecture Structure Stress Characteristics Analysis
Authors: Chen Xiao Jie
Published: April 2014

In the sports architectural form creation, structure technology plays an important role, it is the ideal form of guarantee, elements and form, structure and technology as a method of design, is the factor most architects consider first in sports in architectural creation. Technology of building structure technology as the field of material production, the aesthetic features of its shape becomes the main expression of sports architecture aesthetics, aesthetic psychological effects caused by the people. Especially in large span structure system because of its giant scale and exaggerated shapes, people will lose their normal in the presence of mental judgment scale, often by its magnificent momentum of admiration, moved by the building architectural image and space atmosphere. In the sports building design, construction technical support on architectural forms and form depends on the structure technology is beyond doubt, shaping the spatial image mainly depends on the correct expression of shape.
The Land Utilization Countermeasures on the Old Town of South Jiangsu in the Context of New-Type Urbanization – Take the Old Town, JinJiaba, Wujiang, Suzhou as an Example
Authors: Fan Wen Qun , Chen Zong Yu , Huang Yao Zhi
Published: April 2014

The original townships which are remained by merger of villages and will not be the locations of town governments any more universally have the problems like population outflow, limited land utilization, environmental degradation, etc., but they leave the space for the development of new-type urbanization. Through researching the current situation of the land of the old town Jinjiaba, analyze its problems and combining the development requirement of new-type urbanization, specifically put forward the strategies of revitalizing land to promote the sustainable development of old townships from five aspects: organizing road system, revitalizing stock land, space integration and renewal, integrating layout of urban and rural settlements, and governance of waterfront space.
The Use of the Investment Potential for Planning Sustainable Cities
Authors: Stupishin Leonid , Maria Moshkevich
Published: April 2014

The transition to sustainable development today is the most important goal for most countries. According to the currently existing concept, sustainable development cannot be achieved without consideration of the mutual development priorities in such areas as: social, economic and ecological development of the territory. Methodic of urban planning strategies for sustainable development are presented.
Study on the Selection Pipelines into the Comprehensive Pipeline Trench in Urban Rail Transit Construction
Authors: Bai Yang , Cui Peng Bo , Zhang Qi , Wu Lei
Published: April 2014

It is the main problem that how to select pipelines into the urban underground comprehensive pipeline trench. There are numerous pipelines can be brought into comprehensive trench nowadays, determined the solution which pipelines are brought into comprehensive trench needs to take many factors such as economy, technology, safety, and daily maintenance management. Established the model of selection schemes , firstly sorted and enumerated, then used DHGF (Delphi-Hierarchy-Grey-Fuzzy) method to evaluate pipeline trench schemes quantitatively and analysed the problem effectively and feasibly.
Public Art and Contemporary Urban Culture – Research of Embodiment of Core Value of Urban Public Art in the Construction of Urban Culture
Authors: Li Zhi Guo , Sun Jing
Published: April 2014

As the cultural interpretation and the most intuitionist expression vector, urban public art explain the urban space morphology, aesthetic function by the visual art, construct contemporary aesthetic culture and the public service system of the masses, manifest characteristics of urban culture value and the trend in period of social transition increasingly. It explained the relationship between public art and urban culture core value and construction of Public art in city culture construction in detail. In the end, it presented the realization of culture value taken from public art and the creation of city image by public art.
Landscape Design of Residential Environment in City
Authors: Cui Hui Min
Published: April 2014

With the improvement of living standards, people living concept has changed, from the previous focus on practical, price and other factors, to put forward higher requirements on the natural ecological residential area landscape, environment greening. This paper first analyzes the residential district environmental landscape elements and design concepts, gives some principles of environmental landscape design in residential area, and finally puts forward the residential landscape design starting point.
On the Change of Expression Concept of Chinese Characters in Landscape Design
Authors: Dong Zheng Lei
Published: April 2014

The element of Chinese characters should be applied, inherited and developed in the landscape design, demonstrating its superiority, reflecting the cultural differences of nations and highlighting the national characteristics. The Chinese character applied in the landscape not only shows the visual image but more importantly, it is also the accumulation of traditional historical culture and the expression carrier of it. Landscape design conducts in-depth inquiries and studies of various aspects of regional culture, landscape environment and material element, explores representative elements of the local area, takes the relationship between "form" and "posture" of Chinese character as an important part of the artistic thinking with " implication " as a core, which reveals the inner beauty of Chinese characters to a larger extent.
Numerical Study of Thermal Comfort with the Effects of Canopy Transparency
Authors: Kwon Choul Woong , Shin Sung Woo
Published: April 2014

Several complex thermal indices (e.g. PMV and PET) were developed in the last decades to describe the quantify the thermal environment of humans and the energy fluxes between body and environment. Compared to open spaces the complex surface structure of urban areas creates an environment with special microclimatic characteristics, which have a dominant effect on the energy balance of the human body. In this study, outdoor thermal comfort conditions are examined through numerical model with different transparency ratios in canopy. The intensity of radiation fluxes is dependent on several factors, such as orientation, size and transparency of canopy. Special emphasis is given to the human-biometeorological assessment of the microclimate of building element (canopy) through the application of the thermal index PET (Physiological Equivalent Temperature). The analysis is carried out by the utilization of Ecotect and RayMan software.
A Research on the Design Strategy Suitable for Local Green Building Design in China – A Comparative and Empirical Study on GBES and LEED-NC2009
Authors: Zhang Hao
Published: April 2014

Green building evaluation standards provide references for green building design. This paper did comparative and empirical research on evaluation points and design strategies of Chinese Green Building Evaluation Standard and American LEED-NC 2009, and analyzed the differences between their orientation and applicability. The conclusion shows that the strategy of GBES is more suitable for local green buildings in China.
Ecological Housing Design Strategies for Hot-Humid Climate in Sichuan Basin
Authors: Nie Kang Cai
Published: April 2014

Architecture should adapt to the climate where they are located. Sichuan climate is very special. In most places of Sichuan, it is very hot and humid in summer and mild in winter. Special climate ask for special architecture. Sichuan house have better outdoors environments and better shelter solar, which emphasis the effect of shelter solar with plants. As a kind of ecological architecture, Sichuan buildings are valuable for us to study and develop in China, meanwhile, it is essential to improve their function and design .In the thesis, author explores the methodology and strategies for the Sichuan climate.
A Study on the Energy Consumption of Zhejiang New Rural Residential Buildings Based on LCA Theory
Authors: Wang Guo Xin , Xu Ke Yin , Zhang Ju Hui , Yao Jian Hao , Shen Hui Fang
Published: April 2014

Based on Life Cycle Assessment Theory (LCA Theory), the problems of Zhejiang new rural residential buildings at different stages of life cycle were analyzed. LCCM method of engineering project were adopted to highlight the influence of economic factors on energy-saving process and analyze the energy consumption of Zhejiang new rural residential buildings,so as to put forward reasonable energy-saving measures.
Measurements of the Initial Ground Temperature in GSHP System
Authors: Zhou Ya Su , Ju Wan Lan , Liu Zheng
Published: April 2014

The initial ground temperature (IGT) is one of the most important parameters in designing a ground source heat pump (GSHP) system and evaluating its performance. In this paper, three initial ground temperature test methods are introduced. Except the shallow zone, the ground temperature distribution measured from direct and indirect testing method has very small difference. In direct test, the temperature sensor must be embedded when burying the tube in the borehole which is hard to operate in engineering applications. Thus the direct testing method is suggested to be applied in the scientific research. The indirect testing method could be used in engineering applications. The mean ground temperature could be calculated from temperature distribution except the shallow zone temperature. The results from three calculating methods have a quite small difference. Therefore, the arithmetic average method is suggested for scientific and engineering application to calculate the mean ground temperature. The mean ground temperature is also gotten in TRT conveniently. In the condition of velocity 0.7m/s, water was circulated in the tube system with no heat source for 30 minutes. The average water temperature could be regard as the mean ground temperature with sufficient accuracy.
The Numerical Simulation and Research and Application of Energy-Saving Effect of Hot Air Curtain Jet Velocity of the Dining Room
Authors: Ma Kun Ru , Wang Xin
Published: April 2014

There are often people and goods in and out of the dinning room door, so the door is often open. Heating and air conditioning construction to save energy and to prevent the outdoor air form influencing on indoor environment, set up the air curtain at the entrance of the dinning room to stop outdoor air, the frequently-used air curtain is beam type of air curtain.The project in view of the dinning room of the new campus of hebei university of science and technology, sets up air curtain physical model of the ground floor dining room door at the first area, and carry on reasonable simplification, make sure the numerical simulation calculation area and the sealing condition of air curtain. Then set up physical model for wind pressure, multiply of hot pressure and the local hot pressure at the dinning room door of the air curtain air flow in CFD method. Through the numerical simulation for different jet velocity of the hot air curtain, analysis the temperature field, velocity field, heat loss,heat load parameter, etc. and demonstrate the energy saving effect, and provide reference basis for the selection of air curtain.
Effect of Mineral Admixture on Mechanical Property of PHC Pile Concrete
Authors: Xue Li Li , Shen Yan
Published: April 2014

The mechanical properties of PHC pile concrete with different mineral admixture (fly ashground slagground silica sand) were tested and interface microstructure of the concrete were analyzed by ESEM.The result show that,the compressive strength of PHC pile concrete with 20% ground silica sand or with 30% ground slag can reach more than 80MPa after autoclaved curing;The PHC pile concrete with 20% ground silica sand show the best mechanical properties.The tobermorite C5S6H5 can be observed in ESEM photograph of interface of autoclaved curing concrete.
Experimental Investigation of Stiffened Square CFST Columns under Axial Load
Authors: Zheng Xin Zhi , Zheng Xin Hua
Published: April 2014

Abstract: 7 square steel tubular columns were tested to discuss the ultimate axial bearing capacity, ductility performance and the steel consumption under stiffened by steel belts and binding bars of different cross-sections. Test results indicate that only by increasing fewer amounts of steel usage, stiffened square CFST columns with binding bars can not only improve the overall effects of restraint and alleviate regional local buckling between the binding bars, but also improve the bearing capacity of concrete filled square steel tubular columns. The utility benefits and the economical benefit is considerable, deserving extensive use.
Experimental Study on Performance of Steel and Composite Plate Combined Column
Authors: Wu Fan , Zheng Xiao Yan , Ding Jian Wei
Published: April 2014

Four I-section specimens have been produced, and epoxy resin structural adhesive and bolts have been used to combine the cold-formed thin-walled C steel with bamboo-wood composite plate, through which the cooperative work performance of the combined column was detected, and the failure mode and mechanism were explored. The feature of load vs. deflection and load vs. strain was also analyzed. Then stiffness and calculation formula of bearing capacity were proposed. The results show that the unitary mechanical behavior and plastic properties are very good, and the combined column is divided into three stages from loading to failure, including adhesive cracking, local area degumming and failure. And the stiffness accords with double slash model in serviceability
Experimental Study on Seismic Behavior of Double-Wall Precast Concrete Shear Wall
Authors: Xiao Quan Dong , Guo Zheng Xing
Published: April 2014

To study the seismic behavior of Double-Wall Precast Concrete (DWPC) shear wall, three full scale specimens are tested and compared under low-cyclic reversed loading, including two DWPC shear walls and one normal Cast-In-Situ (CIS) shear wall. By observing their experimental phenomena and failure modes, contrasting their displacement ductility coefficients, hysteretic curves, skeleton curves and energy dissipation capacity, the seismic behavior were synthetically evaluated on aspects of strength, stiffness, ductility and energy dissipation. Compared with CIS specimen, DWPC specimens have higher initial stiffness, increased cracking loads by 43% to 47%, and the ultimate loads increased by 22% to 23%. The displacement ductility ratios also meet the ductility requirements with value of 5. The hysteretic curves of three specimens are plump, and the trend of skeleton curves is basically the same. The DWPC specimens demonstrated a good energy dissipation capacity. All the specimens had shown favorable seismic performance.
Preparation of C80~C100 High Performance Concrete and the Ultrahigh Pumping Technology
Authors: Xu Li Bin , Feng Nai Qian , Zakaria Ideris , Wu Bin Xing
Published: April 2014

The high strength and high performance concrete C80~C100 is popularly used nowadays, especially in the West-Tower Project of Gungzhou. In order to provide reference for the use of high strength concrete and the development of ultrahigh pumping technology, the following six aspects were studied, namely the preparation of high strength concrete, the variation of the concrete mixture under high pressure, the index of the ultrahigh pumping concrete, the change after the pumping, the loss of the pumping pressure and the measurement of the pumping viscous resistance.
Process Technology Silica Sand into Microsilica and Nanosilica for Construction Material
Authors: Tjahjani A.R. Indra , Jonbi Jonbi , Mastra Riadika , Mulyani Endang
Published: April 2014

Nanotechnology has experienced rapid growth, it can be seen the emergence of products and high interest researchers associated with nanotechnology.
The implication process natural resources management is no longer limited to generating value addition, but were able to perform value creation. One potential source is the natural silica sand. Silica sand reserves in Indonesia, among others are, South Kalimantan, West Java, East Java and Papua. Utilization of silica sand has been used as a filler only on the construction materials at a price of 20 - 50 IDR/kg, while microsilica: 12,000 – 15,000 IDR/kg and nanosilica: 100,000-150,000 IDR/kg.
This study develops the potential of silica sand in Indonesia through testing, XRF, XRD, SEM and PSA. Then further process by nanosilica’s equipment in Indonesia, resulting microsilica and nanosilica Indonesia. The end result made ​​comparisons with microsilica and commercial nanosilica.
The results showed that the Planetary Ball Mill (PBM), High Energy Milling (HEM) can be used to generate microsilica. Polishing Liquid Milling Technology (PLMT) can be used to make nanosilica of Indonesia's natural resources, which is equivalent to nanosilica have traded commercial.
Study on Chloride Ion Permeability Resistance Variation of C40 Concrete
Authors: Huang Zhi De
Published: April 2014

The influence of construction seasons and curing condition on chloride ion permeability of entity structure concrete was analyzed, which was based on the monitoring of pier concrete quality constructed seasonal of Qingdao bay bridge. At the same time, durability of entity concrete structure was analyzed combining site construction technology.
Study on the Durability of Normal Strength Concrete under the Action of Salt Corrosion and Dry-Wet Cycles
Authors: Su Xiao Ping , Guo Jin Hui
Published: April 2014

The degree of soil salinization in the west region of Jilin province is very serious, where the composition of salts in the soil and surface water is complex and mainly contains Na+, HCO3- or CO32-, Cl-, SO42-, etc. The concrete engineering projects in such environments are often corroded by a variety of salt corrosion damage under the condition of dry-wet alternation. Based on the previous experimental study on the durability of concrete affected by the factors of both multiple salts and dry-wet cycles, different salts (bicarbonate, sulfate, and chloride salt) soak and dry-wet cycle tests to normal strength concrete (NSC) are conducted in this article. The test results show that all of the bicarbonate, sulfate, and chlorine salt can cause certain corrosion on NSC under the condition of dry-wet cycle. The influence degree of different harmful salts on the mass loss of concrete is as NaHCO3 > Na2SO4 > NaCl > water; the influence degree of different salts on the dynamic elastic modulus of concrete is as NaHCO3 > Na2SO4 > NaCl > water. Under the condition of dry-wet cycle, a variety of salts can make the erosion damage of concrete produce superposition effect, and make the concrete corrosion damage sharpened.
The Analysis of Punching Shear Strength for Concrete Slabs Based on the Unified Strength Theory
Authors: Han Ju Hong , Wang Dun Bin
Published: April 2014

Based on the mechanism of punching shear and patterns of failure of Specimen,using the unified strength theory and rigid-plastic models,the punching strength of reinforced concrete slabs supported on four sides is obtained.The theoretical formula of punching shear strength for concrete slab is given.The calculated results are in good agreement with the experimental results.
The Influence of GGBS on the Shrinkage Performance of Concrete
Authors: Liu Yan , Ma Dao Xun
Published: April 2014

This paper studies the impact of different dosage of GGBS on the early age and later shrinkage deformation of concrete. Through the testing method of early age shrinkage of concrete the volume stability of shrinkage of concrete under different dosage of GGBS is evaluated, and the causes and effect mechanisms of that are analyzed.
Intensity Errors and Origins of Catalyzed Concrete
Authors: Yang Hua Shu , Wang Xue Peng , Yang Yu Lu , Pu Ying Ju , Peng Xin Long , Fan Hua , Wang Bang Yang
Published: April 2014

Orthogonal experiments at concrete materials proved: notable errors will occur when using chemical catalyzing to predict the concrete strength. Errors are unavoidable since such methods have neglected much factors. Ground on test data, effects on concrete intensity were analyzed with changes of sand ratio, bigger aggregate, and environment humidity, cement components. Error origins of concrete intensity were found, and the fact of avoidless errors from chemical catalyzing was notarized. Materials testing combining with fieldwork, new technique was proposed for monitoring quality of fresh concrete in building site. So hidden trouble would be known betimes before elementary solidification in concrete. Practices indicated that this technique is simple and speedy, it can avoid the loss of doing over again in concrete structures and can effectively improve quality of concrete engineering.
Destructive and Nondestructive Testing on Silica Fume Concrete
Authors: Ibrahim Yasser E. , Al-Akhras Nabil , Al-Kutti Walid
Published: April 2014

Factors such as poor design, bad workmanship and a harsh environment can combine to cause deterioration within a concrete structure leading to visually unacceptable surface cracking or spalling of concrete cover [. In aggressive environments, corrosion of steel reinforcing bars is responsible for major deteriorations in concrete structures. Reduction in bar diameter leads to a lower resistance, which can result in brittle failure of the bar. Initiation and progression of reinforcing steel corrosion can lead to progressive weakening of the structure due to damage accumulation over a period of time, or in sudden catastrophic failures, such as the Berlin Congress Hall, a parking garage in Minnesota [. Antonaci et al. [ conducted an experimental study on different concrete cylinders damaged in compression followed by means of linear and nonlinear ultrasonic methods. Arndt et al. [ tested a concrete slab representing typical bridge decks in order to evaluate the ability of NDT methods to detect different phases of corrosion progression in concrete. Reinforced concrete beam-shaped samples were tested by Aveldano and Ortega [ in order to characterize concrete cracking due to reinforcing corrosion under different environments. Shah and Ribakov [ performed nonlinear ultrasonic testing of cubic concrete specimens with different frequency transducers. Al-Amoudi et al. [ investgated the relatioship between compressive strength of ordinary concrete and blended cement concrete with durability propeties of concrete samples and conculded that the addition of blended cement will improve the performance of concrete in ressiting corrosion of reinforcement. The main objective of this study is to investigate the effectiveness of using nondestructive testing to assess the performance of different types of concrete such as OPC and SFC. Also, to correlate different types of nondestructive testing and to investigate the possibility of capturing the occurrence of corrosion in reinforcing bars in concrete.
Experimental Study on Proportion of Tensile Strength and Compressive Strength of the Crumb Rubber Concrete Modified by Latex
Authors: Li Wei , Huang Zhen , Wang Xiao Chu , Zang Zi Sheng
Published: April 2014

The cementitiousness between rubber particles and cement-based material could be raised because of the surface modification of rubber,thus enhance the mechanical property of crumb rubber concrete and improve the interface effect of rubber particles.We had researched the change regulation of the ratio between tensile strength and compressive strength of the Crumb Rubber Concrete Modified by latex,the concrete with various quantity of rubber,under the condition Dosage of latex is 0.5% of cement quality.The result of Experimental prove that,compressive strength, splitting tensile and flexural strength could be enhanced because of latex injecting,and the ratio between tensile strength and compressive strength could be enhanced at the same time.
Nuclear Magnetic Resonance Analysis of Air Entraining Natural Pumice Concrete Freeze-Thaw Damage
Authors: Wang Xiao Xiao , Shen Xiang Dong , Wang Hai Long , Zhao Hong Xia
Published: April 2014

Based on the existed research and analysis methods of air entraining natural pumice concrete freeze-thaw damage, nuclear magnetic resonance (NMR) detection technique was introduced in the present study. From the research of essence of freeze-thaw coupling-induced concrete damage in saline solution, natural pumice concrete porosity and transversal relaxation time T2 spectral parameters were used as criteria, and nuclear magnetic resonance imaging (NMRI) technology, an intuitive method was used to determine freeze-thaw damage quantitatively.
Research on Reinforcing Methods of Continuous Steel-Concrete Composite Beams with Web Openings
Authors: Li Long Qi , Zhou Dong Hua , Liao Wen Yuan
Published: April 2014

By considering the four secondary moment functions ,which are developed according to virtual plastic stress distribution at the perforated section of continuous composite beam. reinforced opening proved to be necessary and reliable .Several reinforcing methods are reserched. mechanical properties are compared with FE results in different reinforced continuous composite beam.The result indicates that the bending and vertical shear capacity of continuous composite beam with web opening can be effectively enhanced to a certain extent. In addition,stiffness and local stability at web opening area are also increase. Effective reinforcing method is presented and can be used in engineering practice.
The Impact of Steel Fiber on the Performance of Lytag Lightweight Aggregate Concrete
Authors: Hang Mei Yan , Sun Cheng Xiao , Zhang Pei Yu
Published: April 2014

The article studies the impact of steel fiber on the performance of lightweight aggregate concrete,including compressive strength, flexural strength, modulus of elasticity and impact toughness. The experimental studies show that steel fiber has little effect on the compressive strength of lightweight aggregate concrete, however, it can improve the pattern obviously. With the increasing of steel fiber content, the flexural strength and impact toughness of concrete increases. With the increasing of steel fiber content ,the elastic modulus of concrete also increases. The studies of this paper provide a certain technical references with the future research of steel fiber reinforced lightweight aggregate concrete.
Feasibility of Biomass Ash (Cattle Manure Ash) Replacing Some Cement in Concrete to Reduce Carbon Dioxide Emission
Authors: Tian Xi Zhu , Zhou Shu Guang
Published: April 2014

Biomass ash (cattle manure ash, CMA) is a waste which comes from combustion cattle manure to gain heat and electric energy. Aim reducing the emission of carbon dioxide that comes from cement production in the period of realizing the Twelfth Five-Year Plan for National Economic and Social Development of China. emission of carbon dioxide of biomass (cattle manure) combustion, the chemical propriety of the biomass (cattle manure) ash and the CMAs present situation of application in concrete are studied in the paper. the result indicate that the biomass ash (CMA) replacing some cement in concrete is feasibility, the analysis will provide basic data for generalizing biomass ash (CMA) application in the concrete.
Antioxidant Activity and Chemical Constituents of Microalgae Oil of Schizochytrium aggregatum
Authors: Lv Jun Wei , Yang Xian Qing , Li Lai Hao
Published: April 2014

Abtrast: This research aimed to explore the antioxidant activity of microalgae oil through in vitro experiment and investigate the constituents of microalgae oil. The antioxidant activity was determined using the 1,1-diphenyl-2-picrylhydrazyl(DPPH)radical scavenging assay,2,2-Azinobis (3-ehtylbenzothiazolin-6-sulfnicAcid)(ABTS)radical scavenging assay, the reducing power,β-Carotene bleaching assay and Oxygen Radical Absorption Capacity(ORAC)assay. BHT、α-tocopherol or Vc were compared as the reference. It can be confirmed that microalgae oil has moderate antioxidant ability. According to GC-MS analysis, the most abundant compounds in microalgae oil were palmitic acid, docosahexaenoic acid and tetradecanoic,constituting 38.1%, 34.24% and 3.39%, respectively.
Collection of Submicron Particles by Polyethylene Composite Materials Collector
Authors: Chang Jing Cai , Tao Ai Ping , Gao Ming Feng , Xu Chun Yan , Ma Chun Yuan
Published: April 2014

Wet electrostatic precipitators (wet ESPs) are good options for effective control of PM2.5 emission. However, the common problems of uniform water film formed on rigid collector limited the applicability of typical wet ESPs, thus could be tend to cause "spark-over" and "back-corona". This research was designed to test the performance of the polypropylene fibrous as collection electrodes for PM2.5 control in wet ESP. Meanwhile, drop spreading feature and volume resistivity measurements of polypropylene fibrous collector were investigated. The results show that drop spreading existed in imbibitions experiments between hydrophobic fabrics contacted with water. The difference of spreading characteristics was accordance to the physical woven properties of fabrics. The relationship between the volume resistivity of polypropylene fibrous and the water addition rate has been investigated. The secondary current by polypropylene collection electrode was 5~20 percent higher than that by FRP. The average number collection efficiencies by polypropylene collector amounted to 89.21% for PM2.5 when the gas residence time was 1.33s at 60kV. The relationship between water addition rate and average number collection efficiency was not more regular than other factors such as gas treatment time or applied voltage.
Cracking in Brittle Material at Presence of a Dislocation
Authors: Hamli Benzahar Hamid , Chabaat Mohamed
Published: April 2014

The present study evaluate the stress field during the cracking caused by applying pressure loading to this ends of material. Our problem formulated by using the brittle material (concrete, ceramic, glass,...) having; elasticity modulus E and Poissons ratio (υ).The fundamental idea of this work rests on the determination of the influence of the dislocation presented near of the main crack on this cracking. This problem can be treated by finite element method while using Software (ABAQUS). One uses a square plate from element fissured at his end (semi-infinite) and a dislocation in the vicinity of the main crack, with various distances between the two cracks (main crack-dislocation), for each distance we have stresses can be found at the end of the main crack. After the determination of these latter, we deduced that the presence of dislocation influences largely on the propagation of cracking by amplification or reduction of this propagation.
Current Research and Development of Silica Aerogel Drying Method
Authors: Xu Meng Yao , Tan Dan Jun , Wang Ying , Wang Peng Qi , He Liang , Yang Jing
Published: April 2014

Silica aerogel is a lightweight nanomaterial,which was originally applied to aerospace and military fields. With the optimization and improvement of silica aerogel production process, it has more applications in the field of energy saving, environmental protection, building material etc. This paper introduces some kinds of drying processes, some methods had been used in the production, while the others are under the consideration.
Preparation of Eu(BA)3phen/PVP Fluorescent Nanofibers by Electrospinning
Authors: Wang Li Yan , Gai Guang Qing , Dong Xiang Ting
Published: April 2014

Eu (BA)3phen/PVP fluorescent nanofibers has been successfully fabricated based on PVP and europium complexes Eu (BA)3phen (BA = benzoic acid, phen = phenanthroline) via electrospinning technology. The as-prepared samples were characterized by field-emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS) and fluorescence spectroscopy (FS). The as-prepared Eu (BA)3phen/PVP nanofibers possess good fibrous morphology, smooth surface and narrow size distribution. The average diameter of nanofibers was about 250 nm. Under the excitation of 274-nm ultraviolet light, Eu (BA)3phen/PVP nanofibers exhibit red emissions of predominant peaks at 592 and 616nm, which are respectively attributed to the 5D0 →7F1 and 5D0→7F2 energy levels transitions of Eu3+ ions. The optimum mass percentage of Eu (BA)3phen to PVP is 15%. The fluorescent nanofibers are expected to apply in the fields of lasers, displays, amplifiers for optical communication, and medical imaging, etc.
Research on Polycarboxylic Superplasticizer with Slump Retaining
Authors: Liao Guo Sheng , Ai Tao , Xiao Yu
Published: April 2014

Adopting methyl allyl polyoxyethylene ether (TPEG) and unsaturated carboxylic acid throught REDOX system synthetize the polycarboxylic slump retaining admixture. Researching the impact factors of temperature,reaction time, acid alcohol ratio, dosage of initiator and molecular regulator to the polycarboxylic superplasticizer with slump retaining.In the circumstance of reaction temperature is 45°C, reaction time is 4 hours, acid alcohol ratio is 1:3.25,dosages of initiator and molecular regulator are 0.27% and 4% by weight.. Using infrared spectroscopy(IR) to characterize the molecular structure of polycarboxylic superplasticizer with slump retaining.
Research on Compressible Flow around Cylinder and Truncated Cone with LES Method
Authors: Zhao Meng , Mao Jun , Yang Guo Wei
Published: April 2014

Numerical simulation with the large eddy simulation, filter function, and Smagorinsky sub-grid scale model is adopted to simulate the compressible flow around a bluff body finite length circular cylinder and truncated cone in high Reynolds number. The law of the drag coefficient, lift coefficient and pressure coefficient obtained from models with various cross-wind speeds was discussed. Process of the vortex generated, shed and dissipated was analyzed and the relationship between the press filed, velocity filed and vortex filed was also analyzed. Average value of the drag coefficient, lift coefficient and pressure coefficient of the circle cylinder in subcritical region are greater than truncated cone. Values of pressure coefficient on the windward side of all the models are consistent. However, it various widely on the leeward side, even on the end face of the cone and cylinder.
Synthesize Biodiesel through SO42-/ZrO2 for Use as Solid Super Acid Catalyst in Biodiesel Production
Authors: Gao Yan Hua
Published: April 2014

This experiment synthesize ​​a rare-SO42-/ZrO2 solid acid catalyst, and investigate the optimal reaction conditions for the catalytic reaction of the catering waste oil and methanol reaction which is preparation for biodiesel. Under a condition of alcohol oil molar ratio of 9:1, a catalyst amount of 4 %, reaction time of 8 h, and reaction temperature of 240°C, more than65% of biodiesel yield was obtained. Each performance index of the Biodiesel can reach the standard of similar foreign products, and the prepared catalyst has good reusability.
Design of Micro Inertial Navigation Computer and Data Real-Time Displaying System Based on FPGA
Authors: Chen Nan
Published: April 2014

To meet the demands of high precision and real-time navigation calculating of some tiny volume projectiles in engineering, a kind of FPGA + DSP architecture hardware calculating system is designed. It transmits motion and attitude information through the wireless transmission and displays the messages on upper computer. In the system, FPGA is the kernel controller, which is used to control all timing logic, start the DSP calculating and transmit the wireless data of navigation information and data acquisition of micro inertial measurement unit (MIMU). DSP as a processor for navigation algorithm, calculates the navigation parameters and transmits the result to FPGA. This design system has the characteristics of low power consumption, small volume and high flexibility. It can collect MIMU data, transmit wireless data and display navigation information on upper computer. The experiment proved that the method is feasible
Intensifying the Processes of Wastewater Purification from Phosphates and Organic Impurities
Authors: Ruzhitskaya Olga A. , Gogina Elena S.
Published: April 2014

The paper presents the results of research aimed at understanding the deep removal of phosphates from household wastewater. Provides a method for deep cleaning of waste water using reinforced material. The most complete removal of phosphate is achieved when using the technology without a return activated sludge. Displaying activating effect of reinforced material to the biological treatment process of organic pollution. Were obtained coefficients of the activation of the biological process with reinforced material.
The Influence Factors of Phenol Wastewater by Complex Three-Dimensional Electrode Polarity Treatment
Authors: Li Ya Feng , Gao Ying , Liu Ji Jia
Published: April 2014

In order to study the influence factors of complex three-dimensional electrode polarity to treat phenol wastewater .Set the mixed phenol wastewater as the research object, by the test of static, adopt complex three-ensional electrode polarity to phenol wastewater. When the wastewater is 10 L,quality concentration is 300 mg/L, the pH value is 3.0, the reaction time is 90 min, electrolytic voltage is 15V, plate spacing is 10 cm, Na2SO4 electrolyte additive concentration is 1 g/L, Fe2+ additive concentration is 0.6 mmol/L, aeration intensity is 0.2 m3/h, removal rate of phenol and COD reached 80.99% and 80.99% respectively . The experiments results show that the pH value, reaction time, electrolytic voltage, plate spacing and aeration intensity has a significant effects on phenol wastewater through complex three-dimensional electrode polarity treatment.