bluuebunny/crossref_metadata_2025 huggingface dataset:
Apply Analytic Hierarchy Process in Green Building Evaluation
Authors: Sun Zhi Juan
Published: June 2012

This paper introduces a kind of comprehensive evaluating method combined qualitative with quantitative analysis - analytic hierarchy process which is based on the provision of China Evaluation Standard for Green Building on comprehensive evaluation index system on Green building. Through examples, we will provide specific algorithm of this method for the purpose of more scientific and reasonable evaluation results.
Study on Construction Claim for International Project Based on Contract Status Analysis
Authors: Zhou Yi Hong , Tan Wei
Published: June 2012

Claim management is the most important content in international contract management. Contract status is a significant way to identify claim opportunity and calculate claim value. In this paper, firstly, the nature of construction claim was disclosed by contract status analysis under FIDIC Conditions. Secondly, how to calculate claim value by contract status analysis was studied and finally it was proved by an engineering practice. It is indicated that contract analysis is a feasible way to identify claim opportunity and calculate claim value. It can provide references for the further engineering practices.
Division and Countermeasures Research of the Interim Constructors Group
Authors: Yang Bo , Li Hui Min , Li Qiang , Cheng Wen Tao
Published: June 2012

This paper studied the current status of the interim Constructors and also made comparison with the status of Constructors. The research results will help the future policy formulation and development of the whole construction industry.
Analysis of the Responsibility of Engineering Accidents from the Ethical Context of Engineers
Authors: Guo Tao , Guo Qiang , Dong Jun Feng , Zhang Jun Tao
Published: June 2012

When project accidents happened, engineers will always become to the scapegoat, because the professional ethics of engineers require they to take the construction quality and public safety in the first place. However, a game analysis of every parties involved in the construction found that the business ethics and supervision system are equally important. So, it is unreasonably to attribute engineering accidents to the professional ethics of engineers unilateral and isolated. In order to solve the engineering accidents fundamentally, institutional building and ethics construction must be combined to a whole.
The Research of Engineering Laboratory Management
Authors: Shen Xiong Wei
Published: June 2012

In the knowledge economy era, the engineering laboratories play an important role for personal training. Based on the understanding of university laboratory management and construction necessity, we first analysis the current situation of engineering laboratory management, then, explores the tube to improve engineering laboratory Richard and the construction of countermeasure, to further improve our country of engineering laboratory experiment teaching quality
Research and Practice on Interface Management in Large-Scale Industrial Construction Project
Authors: Shan Meidi , Zhang Sirong
Published: June 2012

Based on the project management practice in the relocation and technological transformation project of China Tobacco Zhejiang Industrial Co., Ltd, tools and methods are proposed for management of project interface in terms of organizational interface, entity interface, contract interface, which may serve as reference for future large scale industrial project construction.
The Change of Real Estate Enterprises' Strategic Plan under New Situation
Authors: Zhang Jing , Hu Ming Yue , Peng Ying
Published: June 2012

Government strictly regulates real estate industry by a series of policy recently. Because of the great change of polices, the real estate industry was taken a big knock. In order to find out the solution of real estate enterprises keep developing under new situation. By analyzing the external environment factors of real estate enterprises, the study deduces that the change of real estate enterprises’ strategy plane is inevitable. Elaborate the current situation of real estate enterprises from five aspects of strategy plane, and make a conclusion that how to change it. Therefore, ensure that real estate enterprises could avoid policies risk, and keep developing.
Research on Shanghai Districts’ Construction Industry Competitiveness
Authors: Li Xiu Ming , Chen Jian Guo
Published: June 2012

Shanghai districts’ construction industry competitiveness is evaluated and ranked, based on factor analysis, cluster analysis, neural network and the construction industry statistics of Shanghai statistics yearbook in 2007-2011. The evaluation shows that, there is imbalance in the 18 Shanghai districts’ industry scale and output efficiency competitiveness. And the industry in Pudong New Area is far more competitive than the rest of the various districts and counties, which just fits Chinese macroeconomic policies. New countermeasures and suggestions would be established in terms of the characteristics of each district which had been found.
Strategies and Frameworks for Adopting Building Information Modelling (BIM) for Quantity Surveyors
Authors: Quek Jin Keat
Published: June 2012

This paper looks at current BIM adoption overseas vis-à-vis the Malaysian BIM scenario. Issues in BIM usage to be addressed by the industry are discussed. The benefits of adopting BIM for Quantity Surveyors (QS) are numerous and the strategies to pave the way for its adoption are made known. The broad frameworks for reviewing the foreign BIM codes and standards; assessment of priority research areas and their impact; re-engineering systems and processes in the project chain for BIM are explained. The caveats for implementation are visited to provide a balanced view of IT initiatives. New roles for the QS as cost modellers or value modellers from project inception are envisaged.
Preliminary Study on X-Ray Computed Tomography to Evaluate Voids in Porous Asphalt Concrete
Authors: Lin J. D. , Yeh Ming Chin , Sung Po Hsun , Shiu R. H.
Published: June 2012

The study applies Computed Tomography technology to probe into the porous asphalt concrete and air voids content, and at the same time, try to qualify accessible voids and closed voids and to use the result to evaluate the performance of porous asphalt concrete. The nominal maximum aggregate of this study is 19.0mm. In order to adjust the image of the gray threshold, the void of PAC specimen was obtained by cut-and-try method with the mix design. After scanning through the PAC specimen, the self-innovated software is used to calculate the Va(%), accessible voids and closed voids. After careful calculation, it showed that the accessible voids are about 20.3%, and the closed voids are about 1.15%. Base on the study, it could analyze the effect of pore clogging in PAC with improved the durability and lifetime.
The Design of Coal Mine Construction Safety Monitoring System
Authors: Shao Xiao Qiang , Ma Xian Min
Published: June 2012

Incentive vibrating wire sensor monitoring of coal mine construction safety production targets for the specific environment of the mine buildings, according to the release of the coal and gas will produce the phenomenon of electromagnetic radiation, frequency measurement system based on the TMS320C5402 DSP coal mine construction safety the system has a large amount of collected information, excitation, and storage convenience, it can improve coal mine safety in construction reliability.
Adjustment and Self-Help Approach for Improving Housing Unit Quality in Multi-Storey Housing
Authors: Nurdiani Nina
Published: June 2012

Multi-storey housing is one of many living space types which has been provided for low-income society in Indonesia. Occupants in multi-storey housing do adjustment process to increase housing unit quality and their dwelling space. The objectives of this study are to explore and to understand how the occupants do adjustment and improving housing unit quality with self-help approach. This study is needed to get the success providing of vertical housing for low-income society in urban areas of Indonesia. The method of this study use descriptive approach with field research at multi-storey housing in Jakarta. Result of this study gives knowledge about adjustment process in multi-storey housing with self-help approach.
Analysis of the Effect of Atmospheric Environment on Life of Buildings
Authors: Sun Li , Sun Jing , Liu Hongbo
Published: June 2012

Based on the prediction principle of the surplus service life of building’s durability and through prediction of atmospheric climate change, the data demonstrate the atmospheric environment effect will shorten the life of the building.
Common Quality Defects of Construction Projects and their Prevention
Authors: Wang Wen Jing
Published: June 2012

In light of many complaints with regard to common quality defects of construction projects arising in recent years, this paper introduces the common quality defects, analyzes their characteristics, conducts cause analysis from such five aspects as design, construction, environment, raw materials and management and finally summarizes the control measures of quality defects of construction projects before, during and after the construction.
The New Considerate Ways Should Be Found for Reducing Rural Poverty through Development and Exploiting in the New Era - The Development of Depressed Areas and the New Countryside Construction
Authors: Chen Hai Feng
Published: June 2012

The problem of poverty in rural area in Guizhou province is always under observation of the national government, and in order to settle the problem of poverty in rural area, we should eman-cipate thoughts and change view to reduce rural poverty in the new era. The reducing rural poverty work in the new era in Guizhou province was analyzed from the aspects of guidelines、key points、effective way, Main Attack and the Work Points, and resolvent. The research production was tested and verified in objective practice, and the results were remarkable.
Circulation Economic Model is the Necessary Selection Sustainable Development of Chinese Paper Industry
Authors: Zhu Xiu Lian , Chen Feng , Yue Bing , Wang Jie , Cheng Yan Jun , Tong Ming Heng
Published: June 2012

Constructing papermaking industry eco-industrial park is a importance way which can solve the dilemma of resource, environment, and economic development from enterprise group hierarchy. By ecological theories of “key specises” and eco-industrial chain, this paper analyses the feasibility of china’s papermaking industry constructing eco-industrial park. By way of case analysis, prove that constructing papermaking industry eco-industrial park is a feasible way of realizing sustainable development of china’s papermaking industry.
Experimental Study on Slag-Based Composite Admixture
Authors: Zhang Ri Hua , Guo Xian Jun
Published: June 2012

Admixture is a new material used for high-performance concrete. It is mainly used to improve the construction property and service performance and the durability of the concrete. At present, admixture is mainly made of a single component such as the slag, fly ash, silica fume, or mixed with a small amount of plaster. Different admixtures have different effects on the concrete and they have both advantages and disadvantages separately. Based on the principle of “Strength Synergistic Effect” of the composite materials, if the different kinds of admixtures are mixed into the concrete with suitable proportion, the advantages can be developed and the disadvantages will be avoided. In this study, the wide sources of admixtures such as slag, fly ash and limestone are used in the composite tests to develop a new kind of composite admixture which uses the slag as main raw material and has better performance.
The Changing of Taiwan Housing Energy Intensity and Emission Intensity
Authors: Hsu Kun Jung
Published: June 2012

Combining the informations of Taiwan energy balance sheet and National Housing Survey, the paper explores the changing of the housing energy use intensity and emissions intensity. Results of the analysis showed that electricity is the dominant energy type used in Taiwan housing from 1986 to 2005; the accumulated logarithmic growth of electricity use intensity from 1986 to 2005 was 60.1%. The accumulated logarithmic growth rate of electricity emissions intensity from 1986 to 2005 was 96.9%. The major effect of Taiwan housing emissions intensity was electricity use intensity during the study period.
Promoting Green Building Development Strategies in Inner Mongolia
Authors: Wu Jian Min , Liu Zhao
Published: June 2012

With the development of Inner Mongolia urban construction, green building is becoming an increasingly hot word in architectural circle. This paper is based on the reality of Inner Mongolia and refers to experience both domestic and international, analyzing the strategies for promotion and construction of green buildings in Inner Mongolia.
Rational Distribution and Adjusting Strategies of the Industrial Structure in the Ili River Basin Based on Sustainable Development
Authors: Huang Ying , Li Hui Min
Published: June 2012

The industrial structure of the Ili River basin represents obviously the dual economic structure. It has been clearly demonstrated as follows: low degree, virtual ophistication and isomorph co-exist in industrial structures. To change the isomorphic industrial structure and realize the rationalization of watershed industrial structure, we should do as follows: selecting and training the leading industries in Ili River basin; giving more attention to market mechanism and the basic function of it in resource allocation during the dynamic adjustment of industrial structure.
Realization of Sustainable Development of Tour Engineering Land: Guided by the Government and Participated by the Public
Authors: He Qian , Wang Xiu Xiu
Published: June 2012

Tour engineering land is a special type of land utilization. However, at present academic circles don’t put plenty attention to tour engineering land and each related government department and plan unit also don’t emphasis on the problems arising from tour engineering land use. It causes that using and management of tour engineering land is in the chaotic condition. The spread of tour engineering land is increased and will lead to severe waste and damange of land resources. This is mutually contradictory with the tourism vigorous development. The paper creatively combines land utilization plan, land market management with traveling plan to construct the operation pattern of tour engineering land for its sustainable development.
Study on Basic Experiment of Coal Waste Paste Filling Material
Authors: Zhang Xin Guo , Jiang Ning , Wang Heng , Li Yang Yang
Published: June 2012

Based on present situation that coal mining under buildings, water bodies and railways, and solid wastes mainly including coal waste, fly ash in coal mine of our country, optimization proportioning of paste filling material and hydration reaction mechanism is systematicaly researched combining with project practice of paste filling in Daizhuang Coal Mine, Zibo Mining Group. The result shows that: Proportioning design P10 can be used as the optimal proportion results, the rate of cementing material is that the proportion: fly ash: coal waste is 1:4:6, quantity concentration is 74%; Coal waste paste XRD diffraction patterns of different instar shows that its hydration products at different instar stage are mainly gelation of CH, Aft and C-S-H; Relative content of each material in hydration products is different at different instar stage; With scanning electron microscope a certin ettringite is producted after coal waste paste hydrated 8h, and content of C-S-H gelation and CH gelation is increased gradually; Hydration process of portland cement is speed up and the strength of paste is enhanced.
Synthesis of CdWO4 Nanoflakes and Nanorods by a Sonochemical Process
Authors: Liu Jin , Yang Lin Lin , Wang Yu Jiang , Wang Xiao Feng
Published: June 2012

CdWO4 nanoflakes and nanorods have been successfully prepared through a mild template-free sonochemical method without any surfactants. The as-prepared samples were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). It was found that the ultrasound irradiation played an important role in the formation of CdWO4 crystals. The results showed that CdWO4 nanoflakes were first formed at the early stage, and CdWO4 nanoflakes were transformed into nanorods as the ultrasonic time was prolonged from 0.5h to 1.5h.
Kinetics Study on Burning Performance of Polyurethane Foam
Authors: Zheng Yan Min , Zhang Jun Hui , Su Zhao Gui
Published: June 2012

This article uses the thermal analysis to study the kinetics characteristics of Polyurethane foam. The partially oxidized and non oxidized materials were used to study the variation of reaction of the smoldering, and the mechanism of function and activation energy of two substances was obtained. The result show that the oxygenolysis of the non oxidized Polyurethane foam belongs to the second-level chemical reaction, while the oxygenolysis of partially oxidized belongs to the first-level chemical reaction; the oxidization reaction of Polyurethane foam is a process which have lots of reaction steps to mutual promote as well as connection with each steps ; Through the smoldering experiment verify that the response characteristics of the two substances under the same heat flux to a certain extent, and the results agree well with the calculated activation energy.
Common Quality Problems in Bamboo Flooring
Authors: Zhang Qiu Mei , Zhang Wei Mei
Published: June 2012

As a new type of building material, bamboo flooring has been recognized in the market and becomes an ideal material in indoor decoration and refurbishing. The common quality problems of bamboo flooring mainly include the three problems of floor material quality, floor processing quality and decoration and refurbishing quality.
Study on Microcrack Control of Concrete
Authors: Zhou Jie , Zhang Sheng Li
Published: June 2012

Microcrack is the main factor that determines extension of cracks under chemical corrosion and stress in concrete. The microcrack was studied throw rapid chloride permeability method. The chloride permeability factor of six different concrete was tested to characterize total microcracks of the concrete. In order to make the conclusion of the test more reliable, microscope was used to measure the chord length of the microcracks in the concrete, and the microcraks were classified according to the length. After that, all the chord length of different classes was summed up and calculated the correlation of microcrack length and chloride permeability factor. Results showed that microcracks longer than 500µm influenced the chloride permeability factor mostly. Water reducing agent, air entraining agent, polypropylene fiber, silicon ash and fly ash added in could control the expansion of microcracks, and polypropylene fiber had the most remarkable effect.
Calculation Method of Super-Long Pile Group Efficiency in Clay
Authors: Zhou Shu Fen , Kuang Hong Qiao
Published: June 2012

By comparison of existing formula of super-long pile group efficiency, combine the geometric feature of super-long pile group with large length-diameter ratio, simplify the original formula, then a suitable method which calculate the super-long pile group efficiency in clay has been proposed. Taking use of test data to verify the formula and results show that: the pile group efficiency from the method accords with the test value very well.
Numerical Analysis on Roller Compacted Concrete under the Action of Pure Water Pressure
Authors: Huang Zhi Qiang , Zhou Xiao Yu , Hou Jie
Published: June 2012

Based on the RCC（roller compacted concrete） gravity dam, considering the multiphase, heterogeneity and microscopic structure characteristics of RCC, we use the RFPA analysis system to analyze the whole destruction process of the RCC weak level under the action of the pure water pressure in this paper. By simulation, we obtained the distribution of the stress, elastic modulus, water pressure on the whole failure process of RCC weak level and several parameters, such as the up crack load, instability load and critical crack propagation length. By calculation, we got the double K fracture toughness of RCC under the different of water pressure, and the results show that the up crack toughness and instability toughness change regularly with the increasing of water pressure initial value in the mass.
Hollow Crystals of BiFeO3 Prepared via a Al3+-Assisted Hydrothermal Method
Authors: Wang Yong Gang , Yang Lin Lin , Wang Yu Jiang , Wang Xiao Feng
Published: June 2012

The BiFeO3 hollow crystals were successfully prepared at 200oC by a Al3+assisted hydrothermal method. The structures and morphologies of the as-obtained products were characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (SEM). A morphology evolution from irregular shape to square, hollow, and sphere-like was observed as the Al ions concentration varied from 0% to 1.5%. The possible growth mechanism of the BiFeO3hollow crystals was also discussed.
Water-Based Coatings for Building Part I: Preparation and Physical Properties of Polyacrylate-Siloxane Emulsion
Authors: Wang Pei , Zhang Xia Zhen , Heng Li Na , Yu Teng , Chen Xie Wei , Liu Lian
Published: June 2012

This study is to report the synthesis of polyacrylate-siloxane latex with vinyl triethoxysilane(DB-151), methyl methacrylate(MMA) acrylic acid(AA), butyl acrylate(BA) by emulsion copolymerization and characterized by FTIR. The physical properties are also analysized by water absorption, pencil hardness, circle adhesion method, etc.. The polymerization factors for emulsion had been discussed in several aspects. The results showed that the optimal conditions for synthesizing silicone-acrylate emulsion were of DB -151content of 6%~8%, emulsifier OP-10/SDS/ DNS-458 ratio:2/1/1, in stirring rate 450 r/min in the period of disperse and emulsification, stirring rate 200 r/min in the period of synthesis, with reaction temperature 75°C.
Long-Term Performance of Concrete Suffered Infant Age Freezing
Authors: Guo Bao Lin , Yu Chang He , Han Yu , Zhu Ju Peng
Published: June 2012

Interior water migrated towards the surface area when concrete suffered minus temperature during infant ages. Cover concrete became the worst part after the complicated process of water freezing – thawing, intermittent hydration of cementious materials and volatilization. Presentation quality, carbonization depth and rebound value in 120 d ages were observed and tested in situation. There were some calcium carbonate stains spread over the web, many swelling points and radial ice lens spread over the surface of box girder. The carbonization depth was over 10mm, and the rebound value of web concrete lower than 50, some areas’ lower than 35, variance larger than 30. Compared with other parts, the rebound value of web bottom concrete was the lowest and the variance biggest. For the same cross section, there were obviously difference of concrete quality between sunny face and shady ones, which enhanced the un-uniformity of element and made the stress distribution more complicated and uncertainty. Some effective measures must be taken to avoid the infant age frozen in order to assure the concrete quality constructed during the winter.
An Experimental Research on Reactivity of Fe-Based Oxygen Carrier Using Coal Ash as Support
Authors: Shi Si Mo , Qin Wu , Dong Chang Qing , Li Wen Yan
Published: June 2012

This paper is focused on the experimental research of Fe-based oxygen carriers using coal ash as support material. Influence of coal ash size, foamer content, temperature on reactivity of Fe-based oxygen carrier for CO oxidation were conducted in thermogravimetry analyzer (TGA). Experimental results show that conversion of the oxygen carrier could attain 100% under 750 °C, and samples that made from mean coal ash grain size of 0.06 mm are more active than that of 0.09 mm, which prove tiny coal ash grain size can enhance reactivity of oxygen carriers. Besides, reactivity of oxygen carriers under 850 °C are lower than 750 °C for that relative high temperature would cause sintering of the Fe-based oxygen carriers.
Study on Drying Shrinkage Properties of Concrete Using Blast Furnace Slag as Fine Aggregate
Authors: Shi Dong Sheng , Ma Zheng , Wu An Li , Wang Jing Bo
Published: June 2012

In this paper, the experiment about drying shrinkage of concrete using blast furnace slag as fine aggregate was introduced. In this experiment, blast furnace slag fine aggregates that were produced by two different steel factory and natural river sands that came from two different producing area were been used, and compressive strength of concrete for testing were four levels from ordinary strength level to high strength level. As results, the drying shrinkage of concrete that used blast furnace slag as fine aggregate is less than concrete that used natural river sand as fine aggregate when the mix proportion condition of concrete was identical. The relationship between drying shrinkage and age of drying of concrete that used blast furnace slag as fine aggregate could be described by same approximated curve equation that was used for the concrete using natural river sand as fine aggregate. As same as concrete using natural river sand, the drying shrinkage of concrete that used blast furnace slag as fine aggregate would decrease with decreasing of water cement ratio.
Analysis of Temperature Sensitivity of the Synchronous Pavement Sealing
Authors: Xue Peng Tao , Wang Xiu Shan
Published: June 2012

Through the pull-out tests of the following three pavement sealing techniques: rubber asphalt, SBS modified asphalt and SBR modified emulsified asphalt, a contrast was made to analyze the influence of temperature on the pull-out strength and the displacement value of damaged sealing coats, so as to analyze the temperature sensitivity of the three sealing coats of synchronous pavements. The results show that: the rubber asphalt sealing coat, modified by the rubber power, has good temperature sensitivity and the temperature susceptibility of asphalt has been improved, with a greater ductility in low temperature and a better resistance to flow deformation in high temperature.
Preparation of Lacquer Putty Using Polystyrene Foamed Plastics
Authors: Li Guo De , Li Na , Wu Shi Wei
Published: June 2012

Choosing abandoned polystyrene foamed plastics and actived carclazyte as the main raw materials, mixed with emulsifier, defoaming agent and many kinds of additives made into the excellent performance oily lacquer putty. The technological process of the lacquer putty was simple, using abandoned FPS and carclazyte as the main raw material can save energy and reduce the white pollution, which has the good social and economic benefits. The properties of the product were similar to the same kind of the others. The materials were easily gained and its production cost is lower. The lacquer putty was applied to inlay glass or level up holes and slots.
Research on Generating Mechanism and Treatment Measures of Concrete Bubbles
Authors: Meng Hai , Li Zhi Feng , Chen Bi Zhen
Published: June 2012

Concrete bubble is a common phenomenon in the concrete construction process. Generation and existence of concrete air bubble not only influence the concrete appearance, but also affects concrete service life. Especially for concrete surface with high requirements just as water diversion tunnel, concrete bubble gradually raises concern of engineering construction parties. Engineering technical personnel take a number of measures to eliminate concrete surface bubble in project practice. Based on analysis of many bubble elimination methods, generating mechanism and treatment measures of concrete bubble are discussed, providing reference for eliminating concrete bubbles.
Modified Duncan-Chang E-B Model of Unsaturated Clay
Authors: Shen Xi Zhong , Zhang Min , Lan Yan
Published: June 2012

Accurate in apparatus, complex in operation, expensive in fund and plentiful in time, test of unsaturated soil is difficult. Influence of status of dry and wet and degree of compacting was not considered generally when Duncan-Chang model was be used to unsaturated soil. With parameters of model served as constants, it was not consistent with the practice that parameters would be changed with saturation and water content and its application would be limited. General triaxial tests of drainage and consolidation about dry density and water content combined are carried out, influence of relation between stress and strain about clay is discussed, mathematical equations of parameters of Duncan-Chang model are established, thus modified Duncan-Chang E-B model of unsaturated clay is carried out that influence of dry density and saturation can be considered. From study we can see, on the one hand, characteristics of stress and strain about unsaturated clay are influenced obviously by saturation and dry density, the main parameters of E-B model keep close correction with dry density and saturation, and the both mutual effect can be expressed by multiplication. On the other hand, status of compacting and process of gradual change from dry to wet can be described with modified E-B model. Thus it will be more complete in factors considered, inosculate in practice, and convenient for use.
Research on the Mechanical Performance of the Road Base Materials with Steel Slag Sand
Authors: Xu Fang , Zhou Ming Kai , Chen Jian Ping
Published: June 2012

The unconfined compressive strength is used to be the valuation index, the mechanical performance of three kinds of new road base material, which are fly ash stabilized steel slag sand (FA-SS for short), lime and fly ash stabilized steel slag sand (L-FA-SS for short), cement and fly ash stabilized steel slag sand(C-FA-SS for short), are studied in this paper. The results show that the unconfined compressive strength performance of FA-SS is similar to L-FA-SS, and it can meet the highest strength when the ratio of steel slag to fly ash is 1:1~2:1. When the ratio of fly ash to the steel slag is 10:90, it is good to use cement stabilizing. Comparing the new road base materials with the traditional road base material, the former has better strength performance and economy function advantage.
Research of Steel Fiber Self-Compacting Concrete Frost Resistance
Authors: Gao Ming Bao , Zhao Yan Ru , He Xiao Yan
Published: June 2012

With the fast freeze-thaw test method, the c50 steel fiber self-compacting concrete was carried out 300 tests of freeze-thaw cycle. In the process of freeze-thaw cycles, it determined by the quality of the concrete specimen, dynamic elastic modulus and strength, and analyzed the steel fibers and their different contents on frost resistance of self-compacting concrete impact. The results showed that: steel fiber self-compacting concrete in freeze-thaw cycle can play constrained role in the quality loss, dynamic elastic modulus and intensity, and can significantly improve the self-compacting concrete frost resistance. Within a certain range, the more steel fiber, the stronger of frost resistance.
Numerical Study on Reinforced Concrete Core Walls Based on Fiber Model
Authors: Hou Wei
Published: June 2012

Reinforced concrete core walls have become major lateral force structure units in high-rise building. Base on fiber model, the process simulation of a seismic behavior testing on reinforced concrete core walls is presented. The Perform-3D software is adopted to perform static pushover analysis for reinforced concrete core walls, and results from the simulation match well with those from the tests. It is shown that the fiber model is valid for numerical simulation analysis of core walls. Damage development sequence of core wall specimen and yielding condition of each member are analyzed which coincide well with the experimental results. On this basis, effects of more design parameters on bearing capacity and deformation performance are systematically analyzed, and conclusions which is valuable for theoretical research and engineering design are obtained. The influence of axial compression ratio, height-width ratio, reinforcement ratio of coupling beam and span-depth ratio of coupling beam on the seismic performance of core walls are analyzed systemically.
Effect of Admixed Recycled Aggregate on Properties of Recycled Concrete
Authors: Zhao Ya Jun , Gao Ying , He Li Li
Published: June 2012

The mixture proportion of recycled concrete was discussed by orthogonal design method. The influence of water-cement ratio, recycled aggregate quantity on workability, cube compressive strength of recycled concrete was analyzed. The experimental results indicated that，Recycled concrete mix proportion design should consider the impact of the water absorption of recycled aggregate. Unit water amount of recycled concrete should be plain concrete unit water consumption and recycled aggregate additional amount of water. Sand ratio should increase in the corresponding ordinary aggregate concrete sand ratio on the basis of 1 to 3 percent. When the water-cement ratio is 0.36 and construction waste content of 40% slag content of 20%, 28d compressive strength of concrete is 48.1MPa, slightly higher than the reference concrete (48.0MPa).
Study on Properties of Expandable Graphite in Waterborne Fire Retardant Coating
Authors: Lin Hong Yan , Wang Chun Cai
Published: June 2012

Influence of addition amount and granularity of expandable graphite on the facing waterborne silicone-acrylic emulsion fire retardant coating was investigated. The results show that the waterborne silicone-acrylic emulsion fire retardant coating adding expandable graphite can improve its flame retardant time. The coating gets the best flame retardant effect when the addition amount of expandable graphite is 4%(by mass). The smaller granularity of expandable graphite can be more effective for improving the fire retardant performance.
Selectivity Heating Effect of Microwave on Purifying of Natural Graphite
Authors: Li Yu Feng , Zhu Shi Fu , An Yun
Published: June 2012

The effect of non-thermal microwave on purifying natural graphite was studied. It was found that with existence of microwave field, the carbon content of the product was improved from 95.840% to 99.125% and the result of the purifying was affected by the power of the microwave，the reaction pressure and the reaction time. Add 5% (volume fraction) of hydrofluoric acid in the mixed acid system can improve the carbon content of greater than 99.9% of the natural flake graphite. The use of mixed acid of microwave-assisted purification of natural flake graphite is a better way of producing high-purity graphite.
Evaluations of Nano-Sized Hydrated Lime on the Moisture Susceptibility of Hot Mix Asphalt Mixtures
Authors: Shen Ju Nan , Xie Zhao Xing , Xiao Fei Peng , Fan Wen Zhong
Published: June 2012

The objective of this study was to evaluate the effect of nano-sized hydrated lime on the moisture susceptibility of the hot mix asphalt (HMA) mixtures in terms of three methodologies to introduce into the mixtures. The experimental design for this study included the utilizations of one binder source (PG 64-22), three aggregate sources and three different methods introducing the lime. A total of 12 types of HMA mixtures and 72 specimens were fabricated and tested in this study. The performed properties include indirect tensile strength (ITS), tensile strength ratio (TSR), flow, and toughness. The results indicated that the nano-sized lime exhibits better moisture resistance. Introducing process of the nano-sized lime will produce difference in moisture susceptibility.
Flame Retardant Polyurethane Microporous Membrane Preparation and the Performance Testing
Authors: Qu Jia Le , Wang Quan Jie
Published: June 2012

Take liquid phase separation method to prepare polyurethane microporous membrane. In the preparation of microporous membrane process phosphorus add modification flame retardant agent in order to improve the polyurethane flame retardant properties. Experiments prove that the add of flame retardant can increase the flame retardant performance of polyurethane greatly. when phosphorus add quantity of flame retardant agent for 8 % polyurethane microporous membrane flame retardant was the best effect. And microporous membrane other performance also have no obvious effect. Because of flame retardant performance was good, this kind of polyurethane can be widely used in floor synthetic leather, wall paper, decoration, etc.
Significance of Fire Resistance Performance on the Recycled Concrete-Filled Steel Tube
Authors: Liu Xiao , Zhao Lei
Published: June 2012

Recycled concrete was waste concrete re-processing to restore the original performance, so that the waste of resources to re-use. It’s important to study the recycled concrete fire resistance, by analyzing the frequency of the existing building fire, the extent of waste concrete increasing year by year. Through the analysis of recycled concrete as structural components in the deficiencies of strength, seismic and fire resistance, indicates the importance of anti - fire properties of recycled concrete - filled steel tube.
Fabrication and Properties of Green Cellulose Nanofibers/Polylactic Acid Composites
Authors: Li Ming Zhu , Li Da Gang , Deng Qiao Yun , Lin Dong Liang , Wang Yu Mei
Published: June 2012

This paper reports the preparation for cellulose nanofibers (CNFs) and fabricates CNFs reinforced polylactic acid (PLA) composites with the goal of making sustainable ’green-composites’. CNFs were isolated from wood powder by acid and alkali processing combined with mechanical treatment，containing grinding treatment and high-pressure homogenizing. The nanocomposites were prepared by incorporating 1wt% of the CNFs into the PLA matrix by a dichloromethane solution casting method. Fourier transform infrared spectroscopy（FT-IR）and scanning electron microscopy (SEM) were studied to see the structure of CNFs. The FT-IR indicates that the original molecular structure of cellulose is maintained even after matrix components removal and different mechanical treatments and the SEM images show that the aspect ratio of CNFs is over 1,200. The mechanical properties and the coefficient of thermal expansion (CTE) of the neat PLA and CNFs/PLA composite films were investigated. The results indicate that tensile strength and modulus of PLA are improved and the CTE of PLA is decreased with the addition of CNFs. From the results, CNFs show considerable potential as an effective reinforcement for high quality specialty applications of PLA.
Design and Production of Pre-Stressed Carbon Fabric Used in Fabric Reinforced Concrete Board
Authors: Lv Li Bin , Du Mei , Xun Yong
Published: June 2012

Pre-stressed fabric reinforced concrete sheet is used to make permanent model or to reinforce the existing buildings, it will make the surface of reinforced concrete with steel bar tightness and better cracking resistance, it is beneficial to fully manifest the effect of high strength and high modulus before the sheet cracking; the pre-stressed method improves sheet rigidity, it is beneficial for the sheet to cooperate with structure of reinforced concrete. The paper introduced the designing process of carbon/glass braided fabric composite material, and illuminated selecting raw material, means of making fabric, specification and selecting impregnating agent, meanwhile it made simple measurement to the fabric.
Application of Phase Change Materials for Building Energy Efficiency
Authors: Yan Quan Ying , Jin Li Li
Published: June 2012

This paper reviews the application and development of phase change materials in wall, floor, concrete, points out its advantages and disadvantages, provides reference for phase change materials applied in practice.
Analysis for Composite Material in Plate-Cone Reticulated Shell
Authors: Wang Xing
Published: June 2012

Plate-cone reticulated shell is a new type of space structures with good mechanical behavior and technical economy. Composite material plate is light and strength is high, its ratio intensity is higher a lot than steel material, and elasticity property can be designed, so composite material plate specially applies to prefabricated cone unit of plate-cone reticulated shell. In this paper, GRP plate is regarded as linear elastic material from a view to the engineering application, the multi-layer plate element stiffness matrix is derived with the classic theory of plate and shell, and the GRP plate is designed with equivalent method. Furthermore, the static characteristics for plate-cone reticulated shell with composite material plates are also analyzed in the paper. It is proved by the study that plate-cone reticulated shell with composite material plates is more advantageous and has wide application foreground.
Laboratory Experimental Research on Fatigue Performance of Cold Recycled Mixture
Authors: Zhu Hong Wei , Pan Jian Ping
Published: June 2012

The article carries out laboratory experimental research about fatigue performance of two gradation of foamed bitumen and emulsified asphalt cold recycled mixture, and analyzes experiment results by using fatigue statistics theory, on this basis the paper has been obtained a reliable fatigue equation, and makes a comparative analysis of the fatigue performance of cold recycled mixture and hot-mix asphalt mixture.
Effect of Calcined Coal Gangue on the Mechanical Property and Microstructure of Magnesium Phosphate Cement
Authors: Hou Lei , Li Jin Hong , Tong Ling Xin , Zhang Qi
Published: June 2012

Calcined coal gangue was used as active addition of magnesium phosphate cement (MPC). Influence of calcined coal gangue addition on the setting time, mechanical property, mineral phase, and microstructure of MPC had been studied. The prescription was designed as following: the ratio of mono ammonium phosphate to magnesia was 0.25 in mass, additive amount of calcined coal gangue was 0%, 10%, 20%, 30%, 40% to the total mass of magnesia and mono ammonium phosphate respectively, borax additive amount was 0.06 to other raw materials. The result show that calcined coal gangue could extend the final setting time and improve the early strength of MPC. The MPC obtained its maximum compressive strength of 94.9 MPa and 95 MPa with the calcined coal guage content is 0% and 10% respectively. The particles of calcined coal gangue powder filled in the voids of cement matrix as framework and had effect on microstructure. Furthermore, calcined coal guage might participate the hydration reaction in a long age and form a cementing product which result in improvement of MPC’s long time strength.
Research Progress on Ways of Secondary Metabolism in Plants
Authors: Liu Xiu Bo , Jia Yan Shu , Li Na , Gong He , Zhang Yan He , Ma Wei
Published: June 2012

The function of secondary metabolites has been a subject of debate since the first isolation and characterization of these often times structurally complex chemical compounds. By definition, secondary metabolites are naturally produced compounds that are not essential for the survival of the producing organism, as opposed to primary metabolites. Bioassays have revealed a wide range of biological activities, such as cytotoxicity, ichthyotoxicity, antimicrobial and antifeedant activity, antifoulant and anti-cancer activities. However, some of these activities are manifested against organisms that do not represent logical targets, since they would never be encountered by the producing organism in their natural habitat.
Response of Three Wetland Plants Growth and Nutrient Distribution to Earthworms in Constructed Wetland System
Authors: Xu De Fu , Li Ying Xue , Fang Hua , Zhao Xiao Li , Guan Yi Dong
Published: June 2012

The response of growth characteristics (tillering number, plant height, stem diameter, leaf length, and leaf width), and nitrogen (N) and phosphorus (P) concentration of three wetland plants to the introduction of earthworms in a constructed wetland (CW) was investigated under greenhouse conditions. The growth characteristics, and N and P concentration of wetland plants were influenced by earthworms. The addition of earthworms enhanced three wetland plants growth, especially benefiting to the flower formation of the C. indica. The addition of earthworms to CW, the increased rate of plant height, stem diameter, leaf length, and leaf width could be summarized as follows: C. indica > P. australis > T.augustifolia. N and P concentration of Stems, leaves and flowers of wetland plants was increased by addition of earthworms into constructed wetland, and N and P concentration distributed in wetland plants followed the order of flowers> leaves > stems. The N and P removal rate could be enhanced by addition of earthworms into constructed wetland.
Research of the Model Boundary Problem of Xinxue River Constructed Wetland
Authors: Miao Qun , Sun Jing Jing , Xue Song , Bian Lei , Wang Xi Peng
Published: June 2012

This paper taked Xinxue River constructed wetland of Nansi Lake as the study object , researched the boundary problem in the process of modeling and prediction of water quality and quantity. Furthermore, all data collected were expanded, and virtual data points were increased to broaden the range of the model value. Therefore boundary problem was solved effectively, and mode accuracy was also improved.
Electrochemical Corrosion Behaviors of CuZrHfTi Bulk Metallic Glasses in NaOH Solution
Authors: Sun Bin , Zhang Wen Yong , Lu Jin Bin
Published: June 2012

The electrochemical corrosion behaviors of Cu60Zr30-xHfxTi10(x=10,15,20) bulk metallic glasses (BMGs) were investigated in 3 mol/L NaOH solution by potentiodynamic polarization experiments and electrochemical impedance spectroscopy (EIS). The results showed that the BMGs had sufficient corrosion resistance in NaOH solution. The anodic showed grading passivation character, and the passivation current density were very low. The corrosion resistance changed with Hf content changing. The passivation current density of Cu60Zr15Hf15Ti10 alloy was lowest and the charge transfer resistance was largest, which means the best corrosion resistance for CuZrHfTi BMGs. Corrosion mechanisms were not changed, while the corrosion resistance decrease after crystallized for the BMGs.
Study on Improving the Safety Training Effect of Safety Control Staff in Highway and Waterway Construction
Authors: Sun Zhong Qiang , Du Yong Xin , Liu Ya Chang
Published: June 2012

At present, our country is in large-scale capital period, the construction scale of is increasing year by year, and the high rate of accident is becoming one of the hot issues in the society. The safety training is the fundamental means and effective way to improve the safety management level, only through scientific and effective training can improve the workers’ safety awareness and skill, and to ensure safe production and the implementation of all the work. Based on analysis of the main defects and reasons of training in Hebei province, the safety training content combined with the characteristics of highway and waterway construction, and used PDCA cycle model in total quality management for reference, the training system of three categories of staff for safety production perfected. Proposed and used a new training method that combined kinds of advanced devices, make the training an continuous improvement system, obtained a good reputation and result. The most important guidance provided in the study is to enhance the training effect and ensure safety training to develop sustained and healthily.
Research on the Moisture Damage Occurred on the Asphalt Pavement
Authors: Pang Chuan Qin
Published: June 2012

Water is an important reason lead to the moisture damage on the asphalt pavements. In the paper, investigations and tests indicate that the poor permeability of the asphalt layer when the road opening to the traffic is a very common defect nowadays. The permeability would decrease under the hydraulic and air pressure resulted by moving vehicles, the water would directly penetrate the asphalt layer and accumulate at the interface betweens different layers. The precipitation water could also enter the pavement through the cracks and central separation belt, and accumulate as well, which lead to the development of moisture damage occurred at the bottom and upward subsequently. The intrude water also causes moisture failures in the base as well as the asphalt layer.