bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Field Irrigation on Tensile Behaviors of Disposable Drip Tapes Made from Virgin PE
Authors: Wu Shou Jun , Zhang Zhi Hua , Zhu De Lan
Published: August 2013

In the present work, effect of field irrigation on tensile behaviors of disposable drip tape made from virgin PE is studied. Results show that after 5 months (from Novomber, 2012 to next April, 2013) field irrigation tests, there are no intrinsically changes in tensile stress-strain behaviors for the disposable drip tape made from virgin PE along the longitudinal direction. Tensile stress-strain behaviors for the disposable drip tape made from virgin PE along transverse direction is different. After field irrigation tests, the tapes are prone to sudden rupture at the seams accompanied with a relative smaller elongation and acute stress drops while those as-received show large elongation with gradual stress decrease under transverse tensile. However, rebound of the stretched tapes after field irrigation tests is distinctly smaller than those of as-received samples.
Research on the Ecosystem of Architecture Design
Authors: Cui Hai Hong
Published: August 2013

Analyzed the present condition of ecosystem development in the life. Explain the development of ecosystem building of the ecosystem phenomenon in the life and the building. And give the analysis on the ecosystem law of the architecture design.
Discussions on the Ecological Designing of the Preschool Constructions
Authors: Lan Cheng , Liu Zhen , Gao Wei
Published: August 2013

The preschool construction space and environment poses major impacts on childrens growth and development. Looking from the current development situation of the country, the preschool construction maintains no independent posture while existing as the ancillary construction for the residential places. This text carries out discussions from the aspects as its general planning, the planar design and the environment, aiming to promote the ecological designing concept development for it construction. Children are the future for the country, the preschool construction, therefore, should not only meet childrens physiological and psychological development, but should also take its ecological and comfortable properties into consideration.
Construction Strategy for Ecological Residential Building in Marine Environment: Zhejiang as Example
Authors: Sun Jiao Jiao , Fu Jia Yan
Published: August 2013

This paper intends to elaborate the construction motivation of ecological residential building in view of the marine environment with deficient resources and sufficient sunlight; the characteristics of fisherman dwellings will be analyzed and traditional building energy conservation technology will be reviewed and studied. Combined with the low-carbon principle, the eco-technology approach will be analyzed in terms of shape, structure and details, and combined with passive solar technology, the eco-house mechanism that stems from the traditional technology and has geographical features will be put forward. And then the comprehensive strategy of mixed mass function, variable space and due consideration to aesthetics will be put forward, thus strengthening the implementation of island ecosystem residential construction.
The Design of Green Building and Sustainable Development - Take Weifang Art and Cultural Center Project as an Example
Authors: Hua Xiao
Published: August 2013

This paper introduces the concept of green building and sustainable development as well as the relationship between them,combine with Weifang art and cultural center project,explains the design idea of green building and the concept of sustainable development,Finally,it proposes that only to coordinate the relationship among the construction,natural,human and society,can really achieve the green building which is sustainable development.
Green Industrial Building Design for Hot Summer and Cold Winter Zone
Authors: Xiong Lin , Mao Dan Fei
Published: August 2013

This document explains and demonstrates how to design green industrial building . The article analyzes how to implement green industrial building focus on research of green industrial building project design according to evaluation guidelines and explanations of green industrial building. Provide passive design methods proposal for green building. In order to design to create comfortable and productive work environment for the users the construction details shoud be focused on flat and shape ,control,section flat and lighting external space in hot summer and cold winter zone.
Research on Natrual Regeneration Measures of Urban Low-Carbon Ecological Architecture
Authors: Li Dong , Chuan Sun
Published: August 2013

This paper, based on the relationships of Architecture Environment ,conducted systematic research on the means of climate environment design, probed into the tactics of feasibility of climate environment in the architecture design and architecture technologies ,and low-carbon building is not only the demand of the protection of source and energy with ecological environment but also the one that can meet peoples requirements for easy and comfortable ,economic and energy conservation inhabitation environment. When respecting nature, the process of optimizing architectural environment should be promoted actively with creation so as to obtain comprehensive benefits of natural, economy and ecology
Keywords-Nature; Low Carbon; Ecological Architecture; Environment
Experimental Study on Cement Clinker Particles under Impact Force
Authors: Xu Lei , Wang Yong Wei , Gao Gui Bo , Chu Ze Peng , Wang Kai Yu
Published: August 2013

In order to further study the impact crushing mechanism of cement clinker, the impact experiment has been carried out at different impact angles. Impact crushing curves, acoustic emission signal and peak impact force and impact fracture morphology have been systematically studied. It is shown that each impact crushing curve includes an inertia peak and an actual impact peak. AE signal directly reflects the crack initiation and propagation during the process of impact experiment. With the increase of impact angle, the average value of peak impact force decreases. The peak impact force value reaches the minimum at 75 °. The experiment results will offer a successful alternative to the low – energy grinding of cement clinker.
Assessment Model of Concrete Durability in Complicated Environment
Authors: Yi Cheng , Lin Meng Lan , Sun Fu Yan , Liu Hui Xin , Guo Jing , Hu Yu Kun , Man Shou Yuan
Published: August 2013

In this paper, the rule of index weight is determined by analyzing the existing rules of life assessment for concrete. Based on fuzzy decision making of binary comparison, the weight of different factor taking effect in complicated environment can be analyzed. With known effects of each factor, the classification and score of concrete durability can be made. Thus the assessment of concrete durability in complicated environment can be modeled. The model is used to predict the service life of concrete and provide optimize mix proportion design.
Develop High-Strength Concrete of C60 with Local Raw Material
Authors: Hao Run Xia , Guo Xiao Yan , Hang Mei Yan
Published: August 2013

High-effect concrete of C60 was made up by local cement of po42.5 and polycarboxy late super plasticizer through activity of the slag powder and the fly ash. Orthogonal test researches show that C60 adding higher activity index can be made, and it was characteristics of low cost, materials convenience and fine durableness.
Experimental Research on Chloride Ingress into Concrete Exposed to Freeze-Thaw Cycles
Authors: Chen Si Jia , Song Xiao Bing , Liu Xi La
Published: August 2013

The most important mechanism of deterioration occurring in concrete in the cold regions are chloride ingress and freeze-thaw cycles. In this paper, the process of chloride ingress into concrete exposed to freeze-thaw cycles is experimentally researched. From the experimental results, it appears that freeze-thaw cycles make the effective diffusion coefficient become bigger. As w/c ratio increasing and fly ash content decreasing, the effective diffusion coefficient increases. The concentration of salt solution has little influence on the effective diffusion coefficient of concrete.
The Status, Causes, Problems and Prospects of Application of Stainless Steel Materials in Chinese Urban Sculptures
Authors: Wang He
Published: August 2013

From 1980s, stainless steel has been widely used as a kind of sculpture material in China, because there is a large need of quickly constructed, huge-sized modern sculptures during rapid urbanization. But the problems of excessive popularization of art crafts and disappreciation of art emerged. Only through the comprehensive function of improving supervision, promoting art and technique level as well as popularizing social art education, will stainless steel development be ensured in future Chinese urban sculptures.
The Time-Dependence of Chloride Penetration Resistance of Concrete by the Rapid Chloride Permeability Test
Authors: Hu Yan Jun , Du Yan Liang
Published: August 2013

In this paper, the Rapid Chloride Permeability Test (RCPT)-ASTM C1202-91 and Conductance test were employed to measure the effect of curing time on the chloride penetration resistance of concrete. The results indicate that the concrete specimens with longer curing time have higher chloride penetration resistance no matter the concrete with or without mineral admixtures, the concrete conductance has the similar variation trend and similar mathematical descriptions as the chloride diffusion coefficient D with the passage of curing time, and it is a very useful method to measure concrete conductance to estimate the chloride permeability variation at different curing or exposure time.
Renewal Patterns of the Administrative Office Buildings
Authors: Li Fan , Wang Xiao Min
Published: August 2013

With the commencement of the integration construction of urban and rural areas, Chinese rural structural adjustment is occurring. The government behaviors about merging townships bring a large number of vacant administrative office buildings. This paper aims to study the possibility and rationality about the administrative office building reuse in this context. How to renovate depends on the original building space characteristics and the new space requirements. The construction method includes the repair, replacement and increase. Finally, the example that the administrative office building transformed into the disabled care center in the Luonan County proves the possibility and rationality about the renewal patterns. This kind of renewal patterns will save construction costs, bring economic benefits and a good social effect.
Estimating on Creep Strain for Ready-Mixed Concrete during Shrinkage
Authors: Xiao Liang Li , Pan Ming Yang , Chen Meng
Published: August 2013

This paper presents the development of formulas to estimate the creep strain of the reinforced concrete specimens. The experimental part of the work focused on the dispersion of shrinkage strain between reinforced concrete and plain concrete specimens, as well as the equilibrium condition between concrete tension and reinforcement compression. Based upon the experimental data and development formula, the creep strain and concrete age curves of the reinforced concrete specimens are drawn. Moreover, the characteristics of the creep strain are analyzed in detail. The creep strain formula can provide the important data and theoretic basis to “the code for design of concrete structures”（GB50010－2010）.
Preliminary Experimental Study on Self-Leveling Ground Mortar
Authors: Zhang Dong Mei , Lu Ming Shi
Published: August 2013

The effects of the different content of cement-sand ratio,fineness modulus of sand, heavy calcium carbonate and high alumina cement on the self-leveling mortar was studied according to orthogonal experiment.The results show that when cement-sand ratio is 1.33,fineness modulus of sand is 2.2,heavy alumina is 20%,alumina cement is 10%,the mix amount of mortar is optimum.It can get a good performance of self-leveling mortar.
Analysis on Building Sculpture Art from the Perspective of Deconstructivism
Authors: Guo Yi Zhang
Published: August 2013

In order to make sculpture art into the architecture, based on the development of sculpture and architecture, the inner relations of sculpture and architecture was analyzed and compared. Combining with the practical construction scheme design, sculpture art was entered in the process of the interior space and elevation design, so that the architecture absorbed aesthetic elements of sculpture representation, and building forms breakthrough constraints of various kinds of building ontology factors. The results show that the sculpture language is used in architecture, building is more expressive and inclusive, so as to realize the perfect combination of art and practical function. The deconstructive architecture provides plenty of theory and practical basis for the sculpture of building.
Research of Near-Infrared Spectroscopy Method for Wood Density Determination
Authors: Yi Li Li , Li Xue Chun , Wang Lu , Yu Shi Xing , Yang Jin Yong , Wang Xue Shun
Published: August 2013

Wood is a remarkably versatile building material. Density is an important indicator of woods properties, which directly impact on the physical, mechanical and processing and using performance. Therefore, it is very significant to research wood density. To predict China fir density, this paper use near-infrared spectroscopy and wavelet transform threshold, wavelet transform modulus maxima and moving variance method to de-noise near-infrared spectroscopy of the first derivative of the wood. We also build wood density partial least squares analysis model and compare them with the model built by the traditional near infrared spectral preprocessing methods. The results show that wavelet transform and moving variance can effectively remove noise in the derivative spectra and improve the accuracy of the spectral analysis model, which means the introduction of Near Infrared Spectroscopy has a great prospect of application in the analysis of building materials.
Experimental Study of the Mechanical Properties of the Low Elastic Modulus Concrete
Authors: Zheng Min Sheng , Ma Xiao Hua , Liang Guo Qiang
Published: August 2013

By using the 2000kN static and dynamic triaxial test instrument the mechanical properties of the low elastic modulus concrete is studied. The results of the experiment show that the failure modes of the unconfined compression test is crushing-type and the failure modes of the triaxial compression test is shearing-type. Utilizing the Mohr - Coulomb strength theory to design the low elastic modulus concrete cut-off wall is more in line with the actual engineering, but utilizing the first strength theory to design the dam cut-off wall is safer.
Research into the Concrete Freeze-Thaw Damage Mechanism Based on the Principle of Thermodynamics
Authors: Fan Liang , Li Fu Hai , Zhang Yong Wang , Cui Sheng Ai , Li Jian Li
Published: August 2013

Based on thermodynamic principles,this paper uses ANSYS to simulate thermal stress of the concrete piers and analyzes the main factors, namely, structure size, concrete strength, boundary conditions and freeze-thaw cycle system which affect thermal stress. We then draw the conclusion that the existence of thermal stress will make the concrete structure undertake cracking risk. Thermal stress difference in massive concrete structures is large and the influence of thermal stress on concrete structures is only limited to a certain size range; thermal stress inside the concrete increases with the increment of concrete strength grade; thermal stress inside the concrete decreases with the increment of boundary constraint conditions; the rate of change of thermal stress increases with the acceleration of freeze-thaw cycles. Meanwhile, we propose that through increasing the thickness of the protective layer and boundary constraint conditions properly, cracking risk of concrete structures can be reduced.
Analytic Solution of Inverse Regression Equation for Evaluating Concrete Strength of Building Materials: Experimental and Application
Authors: Chen Jian Wei , Su You Po , Chen Hai Bin
Published: August 2013

The basic theory of the rebound method is introduced, and analytic solution of inverse regression equation for evaluating concrete strength of building materials is presented herein based on the inverse regression model. Furthermore, two engineering examples are given, satisfactory results are obtained using the analysis method. The analysis method can be also used to gain the presumption of strength for others building materials and solutions of other inverse regression models.
Mechanical Strength and Microstructure Analysis of Cementitious Wheat Straw Composite
Authors: Zhang Lin , Liu Fu Sheng , Song Ji Yong , Zhang Yan Bin , Dong Gang Gang
Published: August 2013

Wheat straw alkali treatment has impacts on the strength of cement mortar and glazed hollow beads insulation mortar. The results show that the bending strength and bending strength of cement mortar specimen with 4% wheat straw are respectively 58.3% and 40.9% of the benchmark specimen, but bending-press ratio of the latter is 1.42 times of the former. The SEM images reflect the straws influences on the cement hydrate morphology, status and the influence of the number on cement mortar and glazed hollow beads insulation mortar. Compared with the latter, the former C-S-H gel is loose fibrous, failure to form a good network. In the thermal insulation mortar consistency and stratification of the same circumstances, with straw dosage increased, strength first increases, then declining. And folding pressure than in straw dosage is less than 24% more ideal. The SEM pictures show that network C-S-H gel decrease and loose fibrous C-S-H gel increased. At the same time, AFt gradually become attenuate and curly.
The Research on Using Ordinary Portland Cement to Prepare Anti-Corrosive Concrete under Frigid Saline-Alkaline Geological Condition
Authors: Xiao Hua , Fan Sheng Li , Ouyang Ming
Published: August 2013

The saline-alkaline geological environment is highly corrosive to the concrete. Aimed at the saline-alkaline geological environment, the article ascertains how to prepare frost resisting and anti-corrosive concrete with strong endurance.
Research on Properties of Fired Brick and Tile Waste in Road Greening and Establishment of Optimization Model
Authors: Guo Tao , Li Peng Fei , Li Xue Fei
Published: August 2013

It is analysed on planting adaptability and structural adaptation of fired brick and tile waste in the road greening. Multi-level index system on impact of road green layer fill options is proposed.Fuzzy optimization model of multi-objective multi-level index system is built. It is evaluated that fired brick waste and soil, ecological concrete as filling material of planting layer to show the advantages of the application of the fired brick waste.
Research and Application of the Load-Bearing Aerated Concrete Masonry Structural System
Authors: Cheng Jun
Published: August 2013

Load-bearing aerated concrete block A7.5 B07 is applied to the construction , multi-storey masonry residential and cast-in-place structure over ± 0.00 of the residential is made of ceramsite concrete. The results of energy-saving test comply with the requirements of the existing building energy-saving design, exploring a new residential energy-saving system.
Experiment on the Mechanical Behavior of Integrated Concrete-Foam Glass Sandwich Blocks
Authors: Ruan Cheng Jian , Wang Jian Min , Wang Neng Jun
Published: August 2013

The mechanical behavior of integrated concrete/lightweight aggregate concrete-foam glass Sandwich blocks was tested in this paper. Foam glass plate was inserted and poured together into the Sandwich block. The compressive strength and the tensile strength normal to the interface were tested and analyzed. The results indicate that, the compressive strength of Sandwich blocks is mainly depended on concrete/lightweight concrete parts. The damage of Sandwich blocks in tensile test is due to the tensile strength insufficiency of foam glass plates. The bonding between the foam glass plates and concrete/lightweight concrete performs well whether in the compressive or in tensile experiment. It provides a tentative guideline to manufacture jointly poured concrete-foam glass Sandwich blocks.
A Study on Window Design Optimization for Residences in Severe Cold Zones
Authors: Chen Bing Li
Published: August 2013

The aim of this thesis is carrying out a study on the residential architectural design in the central and western parts of Inner Mongolia, with an analysis on existing problems on the window design, based on the theory of residential building design and the energy-saving policy, in order to come up with an optimization of residential window design in severe cold zones.
Significance of Blast Furnace Slag as Coarse Aggregate in Self-Compacting Concrete
Authors: Krishnasami R. , Malathy R.
Published: August 2013

Self-compacting concrete (SCC) is a flowing concrete mixture that is able to consolidate under its own weight. The highly workable nature of SCC makes it suitable for placing in complex structural elements and in sections with congested reinforcement. Utilization of industrial waste products in the construction industry draws serious attention of many researchers and investigators. In this study an experimental investigation has been carried out to study the significance of blast furnace slag as partial replacement for coarse aggregate in fly ash blended self-compacting concrete. The coarse aggregate was replaced by blast furnace slag at 10% to 100% and various tests were conducted to determine the optimum level of replacement of blast furnace slag in self-compacting concrete. The specimens were subjected to compressive strength, split tensile strength and flexural strength tests in addition to fresh concrete properties. Slump flow, J-ring test, L-box, U-box and V-funnel tests were carried out for evaluating fluidity, filling ability and segregation properties of the fresh concrete. Based on the overall observations it could be concluded that an increase in slag proportion increases the strength properties and among the various percentages of replacement 30% is found to be optimum for maximum strength properties.
Effect of Plastic Stage Curing on Long-Term Properties of High Performance Concrete
Authors: Wang Yu Jiang , Tian Qian , Liu Jia Ping
Published: August 2013

Effect of plastic stage curing on long-term properties of high performance concrete (HPC) was studied, thereafter, the mechanism is also analyzed. Results showed that compared to compressive strength, the permeability of surface concrete (especially for silica fume concrete) was more sensitive to plastic stage curing, and deteriorations due to insufficient plastic stage curing cant be eliminated by later longer time of wet curing. Furthermore, the deterioration of pore structure and formation of microcracks were main reasons for insufficient plastic stage curing that affected properties of concrete.
Mechanical Property of Coal Ash Mixed with Clay
Authors: Chen Rong , Hao Dong Xue , Li Dong Zhe
Published: August 2013

A series of tests were conducted with laboratory normal devices to investigate the engineering property of coal ash mixed with various clay contents. By analyzing experimental data, some conclusions were made: It is helpful to improve the compaction effect and significantly reduce the consumption of the water needed in engineering by mixing the clay into coal ash. The shear strength of coal ash decreased slightly with increase of clay content. The shear strength of coal ash mixed with the 30% clay content is nearly equal to that of pure coal ash. With the increase of clay content, the coefficients of compressibility a1-2 have a little irregularly growth. It always belongs to medium compressibility soils.
Ductility and Deformation Performance of Hybrid Fiber Reinforced High Performance Concrete Shear Deep Beams
Authors: Liu Sheng Bing , Xu Li Hua
Published: August 2013

The shear tests were made on 18 different groups of deep beams with steel fiber and polypropylene fiber according to the orthogonal experimental design. For comparison, 2 groups of high performance concrete deep beams without fiber were conducted. Shear ductility and deformation performance of deep beams were analyzed quantitatively. Results illuminate that failure mode of high performance concrete shear deep beam is splitting failure, while hybrid fiber reinforced HPC shear deep beam has two failure modes (splitting failure and diagonal compression failure). The mixing of hybrid fiber makes rigidity of HPC deep beam increase obviously, the strain of web horizontal reinforcement and web vertical reinforcement decrease significantly. The catastrophe of strain of cracked concrete is also obviously smaller and the descending step of loaddeflection curve is flatter when adding hybrid fiber. Hybrid fiber can greatly increase shear ductility of deep beams and shear ductility is at the most increased by 40.7% whereas it can not change the brittleness of shear damage radically. The volume fraction of steel fiber plays the most important role in shear ductility whereas the shape of steel fiber has minimum effect among analyzed six factors.
Verification of the Efficiency of Anti-Corrosion Systems for Reinforced Concrete Constructions in a Laboratory Environment
Authors: Taranza Luboš , Drochytka Rostislav
Published: August 2013

Corrosion of steel constructions due to the affection of aggressive agents is one of the principal problems affecting reinforced concrete constructions. In critical cases, this phenomenon may cause static destabilisation of the construction and as a result, it is necessary to protect constructions using primary and secondary protection which significantly decreases this risk. This paper addresses the options for evaluating various types of protective anti-corrosion systems which use progressive corrosion inhibitor technology in a laboratory environment. Corrosion inhibitors efficiently slow down the course of corrosive processes on steel reinforcement and prolong the service life of building constructions. The rate of efficiency can be verified with high information capability in the laboratory by a series of testing methods.
Temperature Control Measures' Intelligent Optimization for Quasi-Mass Concrete Structure
Authors: Huang Yao Ying , Ding Yue Mei , Lv Xiao Man , Tang Teng Fei
Published: August 2013

Related to temperature control measures and material parameters, crack prevention by temperature control in quasi-mass concrete is an optimization problem including multiple complicated factors. This study tries to do some optimization of temperature control measures in the given concrete thermodynamics parameters circumstance. The quasi-mass concrete structure’s minimum value of the relationship between principal tensile stress duration curves of internal and surface and the tensile strength growth curve are taken as the input, and the gate pier surface heat preservation effect, pouring temperature, water cooling temperature, water cooling time are taken as the output, we establish the optimal temperature control measures by the neural network model. Applying the uniform design principle to combine the temperature control parameters, and using the finite element method to analyze the temperature field and creep stress field in the quasi-mass concrete structure containing cooling water pipes, we obtain the samples, for training the network, to describe the nonlinear relationship between the principal tension stress duration curve and the tension strength growth curve and the different temperature control measures. After inputting the fitting minimum value of relationship between the principal tension stress duration curve and the tension strength growth curve to the trained network, the system is able to automatically select the optimal temperature control measures for crack prevention. The example shows that the proposed optimal neural network model for temperature control measures is feasible.
Effect on Mechanical Properties of Rubberized Concrete due to Pretreatment of Waste Tire Rubber with NaOH
Authors: Ma Qing Wen , Yue Jin Chao
Published: August 2013

Rubber particles were dipped into NaOH solution in order to wipe the zinc stearate generated in the process of preparation of rubber power. Rubber with different particle diameters and mixing amount (sand replaced in equal volume percentage) was adopted to produce rubberized concrete specimens. A series of tests including compressive strength tests, flexural strength tests, elastic modulus tests and ultimate strain ratio tests were done respectively. The results of tests showed that the value of the compressive strength, flexural strength and elastic modulus decreased with the increase of the mixing amount of rubber, while the decrease amplitude was different from each other. The value of ultimate strain increased a little and the ability of toughness and deformation of rubberized concrete were enhanced obviously through dipping rubber particles into NaOH solution.
Prediction of Long-Term Strength of Concrete Based on Artificial Neural Network
Authors: Yang Xiao Ming , Shi Dan
Published: August 2013

Recently, the safety of existing civil engineering structures attracts more and more attention. The long-term strength of concrete plays a key role during the assessment of safety and durability for civil engineering structures. The strength of concrete will gradually decrease during the service of civil engineering structures. It is significant to accurately predict the strength deterioration of concrete for correctly evaluating the safety of structures. The factors affecting the long-term strength of concrete include environment type, age, climate, water cement ratio, amount of cementing material and so on. In this paper, artificial neural network with powerful mapping ability has been selected to predict the long-term strength of concrete. First, there-layer BP neural network with age, water cement ratio, amount of cementing material as input and long-term strength as output was built. Then, the neural network was trained by the samples measured in real structures and the well-trained neural network was test. From the test results, the trained neural network can accurately predict the long-term strength of concrete with the error less then 9%.
Study on Electrochemical Behavior of Prestressed Reinforcement in Simulated Concrete Solution
Authors: Sun Qi Lei , Zhang Li , Dong Jie , He Lu Hua
Published: August 2013

Using electrochemical impedance spectroscop (EIS) and polarization curve technique, the electrochemical behavior of prestressed reinforcement under different stress levels was studied in simulated concrete solution. The results show that: As the stress increasing, the impedance spectroscopy changes significantly, the entire impedance spectroscopy shows an elongated semi-circular deformation, high-frequency capacitance arc radius corrosion decreases with the corrosion progress, in other words, the reaction resistance decreases, the corrosion rate of the sample increases. And when the galvanized steel is in 1064MPa stresss condition, corrosion current density reaches the maximum, is 9 times larger than that of none stress corrosions condition. Under the combined effects of the external stress and corrosive media, dislocation can be emitted, value-added and moves. When it reached a critical state, it would lead to the crack nucleation of Stress corrosion cracking (SCC).
A Preliminary Study of the Recycled Aggregate Concrete Used in U-Shaped Lining Channel
Authors: Zhang Xiao Hua , Meng Yun Fang , Li Rui
Published: August 2013

Under the premise of sustainable development, construction waste is taken as recycled aggregates used in U-shaped lining channel project. In this paper, illustrated by an actual case, we applied the method of orthogonal experiments to research the influence on the compressive strength of the Recycled Aggregate Concrete caused by different aggregate and various amount of additional materials used. Variance analysis and range analysis adopted to conclude the main influence factor and optimal combination, to provide theoretical support for further study.
Properties of Waste-Based Geopolymer Building Blocks
Authors: Huang Feng Hui , Zhou Zong Hui , Cheng Xin
Published: August 2013

The geopolymer building blocks were prepared with fly ash, steel slag, pulverized blast furnace slag, sand and activator by the pressure molding process. Effects of activator on the microstructure and properties of the samples were analyzed by SEM-EDS and other methods. The results showed that the samples activated by sodium hydroxide with the best comprehensive performance: the compressive strength and flexural strength at 28days are 89.9MPa and7.9MPa, the water absorption and softening coefficient are 6.99% and 0.93, and its volume density is 2124Kg/m3. The compressive strength loss and weight loss are 9.20% and 2.44% after 25 freeze-thaw cycles, which meet the requirement JCT/422-2007 Non-fired rubbish gangue brick.
Characteristics of Behavior Setting in Day Service Center for Children with Developmental Disorders
Authors: Choi Hee Won
Published: August 2013

This paper aims to provide data for planning of childcare facilities for the disabled, by examining the current situation of childcare activities in two childcare centers for children with disabilities called Day Service for Children, and clarifying the requirements of planning the physical environment of childcare facilities for the disabled, based on the results of observation studies. The behavioral settings gathered from observation studies were classified as 5 categories: arrival of children and preparation, morning and end day assembly, lunchtime, planned activities, and free playtime. Through analysis of each category, we were able to understand the behaviors of children with developmental disorder and matters that require attention in the planning of space.
Study on the Preparation Process of Corn Straw-Pumice Composite Concrete
Authors: Ma Jian Suo , Sun Jing , Cai Huan Qin , Bai Run Shan
Published: August 2013

In order to prepare energy saving and environmental protection building materials, a new kind of concrete was made by the combination of corn stalks which is the main crop in northern China, natural pumice resources and cement. Corn stalks and pumice are all lightweight material with open pores and large water absorption; therefore they must be pretreated before preparing concrete by blocking holes to reduce the amount of grout. The raw materials used in the experiments are lightweight materials; it is advisable to adopt the pressure vibration molding process to reduce aggregate stratification.
Effect of Fly Ash and Nano-CaCO3 on the Viscosity of Cement Paste
Authors: Sun Ren Juan , Zhao Zhi Qin , Huang Da Wei , Xin Gong Feng , Wei Shan Shan , Zhi Ge
Published: August 2013

The effect of fly ash and nanoCaCO3 on the viscosity of pastes was studied. The rheological value of cement paste was determined by the rotation rheometer NXS-11B. In the study, five different dosages (0%, 20%, 30%, 40%, and 50%) of fly ash and three levels of nanoCaCO3, 0.5%, 1%, and 2.5%, were considered. Viscosity of the pastes, made with fly ash and nanoCaCO3 at a constant water-to-binder ratio of 0.35, were measured and analyzed. The results indicate that the pastes with fly ash or/and nanoCaCO3 still fit the Bingham model. The addition of fly ash reduced viscosity, however, the addition of nanoCaCO3 increased viscosity. The effect of nanoCaCO3 is more significantly than fly ash on viscosity.
Research on the Applicability and Property of Iron Tailing to Produce Autoclaved Concrete
Authors: Sun Ren Juan , Huang Da Wei , Li Mao Zheng , Wei Shan Shan , Zhao Zhi Qin , Ge Zhi
Published: August 2013

Tailings use is an important environment program and also society subject. Iron tailing is an environmental pollution resources, but it can be used to produce autoclaved aerated concrete (AAC). The chemical composition of iron tailing and the mineral compositions were analyzed by XRD test. The content of radioactive substance in iron tailing was also tested. The testing results show that the iron tailing meet the requirment for AAC production. Iron tailing was sieved to analyze the gradation and was milled by the ball grinding mill machine to proper fineness. Based on the given material mixing ratio, sample test showed that the density of AAC varies from 438 to 629 kg m-3 with different finenesses of iron tailing, and the height ratio of final height to casting height of AAC changes with the finenesses of iron tailing. The research findings have important lessons for the production of aerated concrete with tailing.
Dispersion of Mutiwall Carbon Nanotubes
Authors: Sun Ren Juan , Wei Shan Shan , Zhao Zhi Qin , Huang Da Wei , Ge Zhi
Published: August 2013

This paper studied the ratio of dispersion of multiwall carbon nanotubes (MWNTs) in different surfactant solutions. Effects of surfactant type and concentration and MWNTs to surfactant ratio were investigated. Test results indicate that sodium dodecyl sulfate (SDS) and TNWDIS were better surfactants. Samples with SDS to MWNTs ratio of 6 or TNWDIS to MWNTs ratio of 0.6 had higher ratio of dispersion.
Electrical Resistivity and Piezoresistivity of the Carbon-Nanotube Cement-Based Composite
Authors: Sun Ren Juan , Wei Shan Shan , Zhao Zhi Qin , Huang Da Wei , Ge Zhi
Published: August 2013

This paper studied the electrical resistivity and piezoresistivity of specimen of cement paste made with multiwall carbon nanotubes (MWNTs). The twelve sodium dodecyl benzene sulfonate (SDBS) was used as surfactant. Specimen had a MWNTs to SDBS ratio of 1/4 and contained 0.2% NWNTs by weight. Different dispersal durations, 15min, 30min, 45min, were adopted. The test results show that under the same period of curing, when the dispersal time of MWNTs was 45min, the electrical resistivity of the composite was the biggest and the curve was the varied；with the age growth, the electrical resistivity increased obviously；with the increase of moisture content, the resistivity decreased significantly.
Performance and Preparation of Porous Materials Using FGD Gypsum as Aggregate
Authors: Qian Chao , Gao Wen Yuan , Luo Chun Yuan , Liu Gui Shan , Hao Hong Shun , Hu Zhi Qiang
Published: August 2013

Porous material with raised flexural strength 34.43 MPa and porosity 33.069% obtained at 1070 °C for 0.5 h, shows that its bulk density of the materials decreases down to 1.450 g/cm3 using FGD gypsum as aggregate. The closed porosity and dense structure of sample has been observed by SEM and the main crystalline phases of the sample using XRD techniques are quartz, mullite and anorthite. The calcium oxide from FGD gypsum decomposition helps to form the crystalline phase of anorthite and to improve the flexural strength of sample.
Review of Research on Sustainable Community
Authors: Qin Xiao Dong , Zhang Yong Hong , Lei Jie
Published: August 2013

This paper adapts to carrying on studies to document sustainable community and practice of sustainable community in recent years, defines the sustainable communities, and reveals origin and evolution of the concept of sustainable community, and has summarized the research progress of sustainable community and practice of sustainable community.
Study on Correlation between Vegetation Restoration and Physics and Chemistry Characters of Soil in Embankment Slope
Authors: Liu Yang , Qiu Zhong Ping , Shen Jun Ru , Hu Yue , Liu Yin Yin , Shen Chun Rong
Published: August 2013

By study features of recovering vegetation and physics and chemistry characters of soil in embankment slopes of 3 years and10 years respectively, the correlation among those factors were investigated . The results show: the physics and chemistry characters of soil vary observably with recovering process; Soil bulk density decreases while soil moisture, TP, TN and organic matter content increase evidently; Although the coverage of vegetation changes little, the structure of vegetation community becomes more complex and spatial distribution is more even; The correlation between spatial distribution of vegetation and characters of soil is most remarkable. With process of restoration, the vegetation is affected more effectively by water and nutrients in site.
Shape Design and Flow Simulation of Mixing Impeller for Industrial Waste Oil Purification
Authors: Wang Xu Dong , Zhang Xian Ming
Published: August 2013

High efficiency of mixing impeller is an important target of the reactor for industrial waste oil purification. The structural and geometric characteristics of mixing impeller is ploted and presented. The shape design and performance analysis of airfoil section in impeller blade is introduced. Then using solidworks software, the design mixing impeller model under the industrial waste oil field is obtained. Finally, the flow characteristics are simulated to learn the performance of design mixing impeller.
Mathematical Derivation of Concentration Addition, Independent Action and Effect Summation Models
Authors: Ge Hui Lin , Liu Shu Shen , Su Bing Xia , Xu Zhi
Published: August 2013

The assessment of the combined effects of substances is usually based on concentration addition (CA), independent action (IA) or effect summation (ES) models. Both concepts are founded on different modes of actions of substances, but the knowledge about their relationship is rare. In this paper, we derived a series of inequalities for CA, IA and ES models, and proposed two novel models i.e., ES with the exponent e (ESE) model and ES with the power of the number of components n (ESN) model to evaluate the mixture effect. Our results may have certain significance in mixture risk assessment practices.
Tests on the Dissolve Settlement Characteristics of Sulphate Saline Soil
Authors: Dong Chun Hui , Dong Xiao Ming
Published: August 2013

The dissolve settlement characteristics of sulphate saline soil were analyzed by centrifugal simulation test. The results show that the coefficients of dissolve settlement increase with the increase of centrifugal acceleration and are not relevant to salt content. The coefficients of dissolve settlement are very sensitive when the centrifugal force is less than 300 kPa. Its dissolve settlement deformation is the greatest when the content of SO42- is 2.14%.
Kinetic Spectrophotometric Determination of Tin by its Catalytic Effect on the Oxidation of Arsenazo M by Potassium Bromate
Authors: Cai Cheng Jie , Zhou Zhi Rong , Chen Su Ping , Fang Yan Ling
Published: August 2013

Based on the catalytic effect of trace tin on discoloring reaction of arsenazo M (AsA M) with potassium bromate in 0.08 mol/L sulphuric acid solution, a method for the determination of trace tin by kinetic spectrophotometry was studied. The results show that the maximum absorption of AsA M is at 540 nm and the detection limit of the method for tin is 0.22 μg/L. Beers law is obeyed for tin in the range of determination is 0.7210.0 μg/L. Combined with tributyl phosphate (TPB) chromatographic separation, the method has been applied to the determination of trace tin in rock samples with satisfactory results.
Analysis to Evolution of Numerical Simulation to the Whole Process of Destroy for Main Arch of Stone Arch Bridge
Authors: Mao Liang Yan , Wang Chang Qing , Zhang Li Yong
Published: August 2013

6m arch board used as test object, this paper introduces the arch in different level of load board cracks, development and production of plastic hinge until the whole process for all the damage simulation numerical simulation analysis then compared with experimental results and analysis of increased with load crack distribution, which can be used to understand the similar in service work condition of the stone bridge.
The Technology of Determining Strengthening Economic Index in Integrated Condition Assessment for In-Service Bridges
Authors: Wang Zong Ren , Wang Bing , Li Guo Ming , Rui Jie
Published: August 2013

In this paper, it is on the basis of gaining the main influence factors of strengthening economy for in-service bridge, using recursive hierarchical structure of analytic hierarchy process, constructing the assessment models about strengthening economy for in-service bridge in bottom, middle and top levels, combining with weight modify technology and fuzzy mathematics theory, the assessment results strengthening economic state is gained finally. By practical test, it can discriminant bridge using actuality effectively, and it has been a good guide to maintain in-service bridges safely, effectively and reasonably for maintenance administrative departments, and save a great deal fund for bridge construction cause.
Numerical Simulation of Ultimate of Slings for Three-Tower and Four-Span Suspension Bridge under Tanker Fire
Authors: Liu Mu Yu , Tian Wei , Wang Ying , Jing Wu
Published: August 2013

Three-dimensional finite element model of Yingwuzhou Yangtze river bridge was established by using the finite element software ANSYS. Since the characteristics of bridge fire differed much from that of buildings, Heating curve HCinc was selected as heating curve caused by tanker fire. Heat loading was imposed on the middle of main span where the tanker fire had taken place of three-tower and four-span suspension bridge . The temperature field and stress, modulus of elasticity, strength of sling changing with time caused by tanker burning in midspan were systematically investigated to obtain the failure time of the sling. The calculation also compared the above results of HCinc curve with that of ISO834 curve. This research can provide some references to fire risk prevention measures of bridge during its service life.
Urban Bridges Temperature Measurement System Based on Fiber Bragg Grating Sensing Technology
Authors: Wen Xiao Lan , Li Yi , Wei Hua
Published: August 2013

In recent years, with the rapid urbanization process and increased accidents of bridge damage and collapse, the research of bridge health monitoring and early-warning technology for the public safety has been promoted. Temperature load is one of the main loads to incur the deformation and the variation of stress of bridges. So temperature measurement is an important component of health monitoring for urban bridges. In this paper, a smart temperature measurement system is described which takes advantage of FBG sensor performance characteristics to improve the bridge temperature measurement. At present, the system has been integrated and applied in the project of main roads bridge Online Safety Monitoring Management System in Hangzhou (Phase II), a web-based urban bridge cluster monitoring system have been established since 2007. According to a tied arch bridge case studies, the one-year measurement data shows that the system not only can accurately collect the bridge temperature information and variety, but also successfully improve the performance benefits such as reduced measurement uncertainty, increased robustness, and failure prediction and detection.
Loading Tests Research on Mianyang Anchang River Landscape Footbridge
Authors: Yan Meng , Wu Nan
Published: August 2013

Crossing Anchang River in Mianyang City，Anchang Landscape Footbridge connects Yuyingba and Baisheng Plaza. It bears large amount of pedestrian loads. The approximately anti-symmetric structure of this prestressed concrete bridge is girder-arch combined with unique and elegant appearance. However, without much design and construction reference, loading test is necessary for this footbridge to ensure its security in the future. Tanks are adopted in static test as the equivalent pedestrian loads to imitate the actual working conditions of the bridge and to assess its working capacity and construction quality, providing basis for the completion and the design exploration. Test methods and analysis results of this footbridge can be used as reference in loading test and dynamic performance analysis of similar bridges in the future.