bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of EFQM-Based Excellence Model in PPP Projects
Authors: Yao De Li , Du Ze Chao , Hu Yang
Published: June 2012

Public Private Partnerships (PPP) is widely applied in worldwide infrastructure development. The performance of the PPP project company should be under monitoring of the public sector to ensure that the reasonable interests of the public users are not sacrificed. In this regard, a key issue is the qualitative and quantitative measurement of the services provided by the project company. This paper introduces the European Foundation for Quality Management (EFQM) based excellence model, which has been popularly used in enterprise management, into the PPP projects. Firstly, a comprehensive literature review is conducted, that, an EFQM Model is introduced and its advantages for PPP projects are analyzed. Then, the performance evaluation criteria are established and the performance indicators are identified for PPP projects based on literature review. Finally, a performance evaluation model for PPP projects in general is formulated based on the EFQM model.
Design of Safty Network and Power Distribution of Underground Shops of Suqian Powerlong City Plaza
Authors: Li Shou Jun , Ma Xiao Ping , Yu Hong
Published: June 2012

This paper focuses on two main aspects including building safty and energy saving of power distribution system. First of all, BACnet protocol based network characteristics of safty system of underground shops of the Suqian powerlong City Plaza is introduced. And then the fieldbus control network which centers around world well-known PLC such as AB ControlLogix, Siemens S7-300 and Siemens S7-400 is mainly adopted in the design of fire linkage system. ControNet network connects to PROFIBUS network by PD-100S protocol convertor which can convert one protocol to another between DeviceNet and PROFIBUS-DP network. In the design of power supply network, power loss caculation of dry-type transformer is considered firstly, and then empirical design mistaken cognition of power supply network is analyzed and solution for improvement is presented.
Numerical Simulation Analysis of the Groundwater’ Temperature Field in the Concentration Area of the Water Source Heat Pump Engineering
Authors: Wei Wei , Wang Ming Zhong , Pan Jun
Published: June 2012

In order to avoid the heat transfixion among users in the concentration area of the water source heat pump, a suitable layout of pumps for drawing and recharging wells is required. Finite element method is adopted to establish the numerical model of groundwater temperature to predict the change trend of water temperature. The results of the simulation indicate that the groundwater temperature change from 6.3 to 14.2 °C in winter, and from 11.5 to 21.2 °C in summer. These results meet the requirements of the drawing and recharging water in the water source heat pump engineering and are able to avoid the heat transfixion among users. The effect of drawing and recharging water in the water source heat pump engineering to the changes of the groundwater’s temperature field can be analyzed quantitatively through establishing the proper numerical simulation which provides a reference to scientifically design the layout of pumps for drawing and recharging water.
Numerical Analysis of Wind Load on Large-Scale Storage Tank under Inverse Installation
Authors: Lv Dong Li , Zhang Tao
Published: June 2012

Inverse installation method of large-scale storage tank has such advantages as less investment, high efficiency, no aloft work, et al, but instability problem may occur during the promotion process in the case of a gale. To evaluate the wind load encountering a gale during the stage of construction, flow field around tank was studied by CFD. Based on simplification and model building of flip tank, the flow fields were simulated for different inlet wind velocity. Combined with the contract of the velocity field inside and outside of tank, the characteristics of the pressure distribution on the tank wall were discussed. The horizontal and vertical wind load on tank wall was calculated and the law of wind load affected by inlet wind velocity was analyzed. The result of the wind load for different inlet wind velocity provided the basis of construction stress analysis of hydraulic lifting equipment for flip-tank.
Reflections on the Construction of Affordable Housing Communities
Authors: Gong Xiao Fang , Wang Yan Shu , Li Wen Ting
Published: June 2012

From foreign experience and lessons, the urban living space differentiation has brought about serious social problems. At present, during the large-scale urban residential development and construction process in China, there is a trend of differentiation, but it is not yet fully formed. In this regard, the author is trying to find out the ways to build affordable housing communities through such measures as the government policy guidance, the building of a harmonious community, the employment of mixed living pattern, and the heritage of humanistic ideas.
On Eco-Village Planning in the Under-Developed Area in Middle China
Authors: Zheng Yun Yang
Published: June 2012

Jiangxi province, located in middle China, boastful of its unparalleled natural environment, is under-developed and industrially backward. Given its local conditions and environmental advantages, it is feasible to adopt the eco-village planning in the new rural construction. The paper analyzes the current situation and existing problems in Jiangxi villages and puts forward the concept of eco-village by combining the author’s personal investigation and engagement in some recent cases in that area, and finally concludes the appropriate standard and requirements for the local eco-village planning.
The Orthogonal Test Design and Analysis for High Additive Fly Ash Firebrick
Authors: Gao Shao Xia , Yu Bao Chu , Gao Chao , Wu Li Zhi
Published: June 2012

In order to arrange the limited test for considering the influence of high additive fly ash firebrick to different element comprehensively and effectively, the authors arrange the orthogonal test and put forward the best proportion scheme and propose industrial production properly through the systematic analysis of the test results.
How to Lead Low-Carbon City Construction Development by Low Carbon Ideology
Authors: Fan Xiao Li
Published: June 2012

Climate crisis has become the main concern of International community. China is undergoing the quick growing period of urbanization. The fast urbanization inevitably encountered a lot of problems and defects. Our carbon emission occupy more and more percentage of the whole world. To change the traditional way of constructing activity and work towards low-carbon city development mode is the most important task of China city development. From the causes of low carbon cities construction and its significance, this essay focuses on the space structure, traffic mode, land use and landscape architecture framework of constructing a low-carbon city. Low carbon urban construction planning is also presented.
Review of Agent Construction Management for Government Investment Projects
Authors: Yi Hong Lei , Wang You Song , Pang Yong Shi
Published: June 2012

Current situation and tendency of Agent Construction Management for Government Investment Projects (ACMGIP) are summarized in order to lay a sound foundation for normalizing the ACMGIP in China. Large amount of literatures are investigated, and related analysis, comparison, classification and summarization are carried out. Regarding to ACMGIP, the origin, evolution and definition are classified and summarized, as well as the problems encountered in practice are analyzed. Based on the mentioned works, five tendencies of ACMGIP are forecasted: (1) build whole range dynamic audit oversee mechanism; (2) form and complete management system of professionals; (3) change the agent into professionalized management complex; (4) reinforce contract management; (5) integrate ACMGIP with proper other project management mode.
Critical Success Factors for Construction and Demolition Waste Management in Pearl River Delta of China
Authors: Liu Jing Kuang , Wang You Song , Lin Yi Yong
Published: June 2012

Numerous new construction and demolition and relocation projects in China associated with the rapid economic development have produced a large amount of construction and demolition (C&D) waste, which urgently calls for better and more efficient management. The generation of C&D waste is associated with the waste management on construction sites. Since many factors influence C&D waste management, it is necessary to make in-depth study of them in order to realize efficient C&D waste management. The purpose of this paper is to investigate the Critical Success Factors (CSFs) of C&D waste management in China. To address the issue of C&D waste management, the authors chose the building construction projects in the Pearl River Delta of China as the survey object. We conducted a questionnaire survey and semi-structured interviews with practitioners (e. g. , supervision engineers and structural engineers), researchers, and government officials for tackling C&D waste management. Based on the survey and the interviews, we identified Six CSFs for managing C&D waste: (1) C&D Waste Management Regulations; (2) Awareness of C&D Waste Management; (3) Low-waste Construction Technology; (4) Fewer Design Changes; (5) Research and Development in C&D Waste Management; and (6) Vocational Training in C&D Waste Management. These CSFs can serve as valuable references for building project actors to develop effective C&D waste management strategies. This research also provides information to reduce environmental pollution coming from C&D waste.
A New Buffer Setting Method Based on Activity Attributes in Construction Engineering
Authors: Liu De Yin , Chen Jian Guo , Peng Wei
Published: June 2012

The direct application of the Theory of Constraints (TOC) to construction engineering, known as Critical Chain Management and Buffer Management (CCM/BM), has recently emerged as one of the most popular approaches to schedule management. However, the existing buffer setting techniques have less aken the activity attributes into account. In this paper, we introduce the concept of structure entropy to reflect the complexity of schedule network of construction project and propose a novel method for buffer sizing based on an in-depth analysis of activity attributes. After simulation test and comparison with classical methods, the proposed method is proved to have better accuracy and effectiveness.
Influence of Particle Sizes of Asphalt Emulsion on the Properties of Cement and Asphalt Mortar
Authors: Tian Yi , Yu Yang , Zhang Yu Zhen
Published: June 2012

The influences of particle sizes of asphalt emulsion on the storage stability of emulsion and properties of cement and asphalt mortar were studied. Results indicated that, the storage stability was improved with the decrease of particle size, while the emulsion stability was not improved significantly when the particle size was less than 3μm; the fluidity was improved while the separation rate was increased with the decrease of particle size; the early strength of CA mortar was increased when prepared with the emulsion with larger particle size; while the emulsion with smaller particle size was benefit to the late strength development of CA mortar.
The Teaching Study of Different Steps in Flow Process Construction
Authors: Wei Dao Sheng
Published: June 2012

Flow process construction is the basic theoretical course and key knowledge of construction organization, and also is not easily understood by students in teaching. When n activities and m construction sections in differ-step flow process construction is chosen, if among randomly three continuous steps, the middle step is the minimum step, then the non-interval project flow duration (T’) is less than the non-idleness project flow duration (T) , and the time variation can be calculated, the deviation of the non-interval project flow duration (T’) with the non-idleness project flow duration (T) is the sum of the product of any many (m-1)×(the maximum flow step from another side minus the minimum flow steps among three continuous flow steps), otherwise, T’=T.
The Review of Project Management Based on the Theory of Constraints and Critical Chain
Authors: Zhang Zhao , Guo Bing , Chen Gui Xiang , Song Jiu Le
Published: June 2012

Abstract. The relationship between precedence and successor activities is the only factor that determined the project scheduling in the traditional project scheduling management. The critical chain-an elegant solution, on the other hand, takes resource limitations into account and is composed of sections that are dependent on successor relationships and other sections that are dependent on resource constraint. By integrating the existing research findings, it is the objective of this paper to highlight the merits and pitfalls of the CCPM scheduling method, such as the principle for project delays, the critical chain identification; the time buffer setting and project scheduling with limited capacity of a resource. Furthermore, it also presidents the difficulties when implementing the critical chain approach and conclude with a description of our ongoing research direction.
An Analysis on Performance Evaluation and Supervision System of Public Investment Projects in China
Authors: Yang Fei Hu , Huang Su Juan , Wu Qin
Published: June 2012

This paper discusses the establishment and improvement of the performance evaluation and supervision system of public investment projects in China, aiming at promoting the standardization, scientific and rationality of China’s public investment. We constructed a benign long-term mechanism which is deterrent to corrupt behavior in the field of public investment and also promotes economic growth, in order to improve the operational efficiency of public investment projects in China.
Study on the Quality Management of Security Housing
Authors: Liu Lihong
Published: June 2012

This paper discusses about the quality management of security housing. The paper analyzes quality problems which happened in the process of security housing construction, and analyzes the factors of impaction about the quality of security housing. There are some uncoordinated points and problems between the public goods characteristics of security housing and the policies about these characteristics and security housing construction quality. In the end it proposes specific countermeasures to solve the quality problems. Construction security housing is a systemic engineering and it needs multi-joint efforts and coordinated function of all participants.
Experimental Behaviour of Concrete Filled Steel Tubes (CFST) with Initial Concrete Imperfection Subjected to Eccentric Compression
Authors: Liao Fei Yu , Li Yong Jin
Published: June 2012

Gap between steel tube and concrete core could be recognized as a type of initial concrete imperfection in concrete-filled steel tubular (CFST) members. This paper is an attempt to study the effect of gap on the behaviour of concrete-filled steel tubular (CFST) columns subjected to eccentric compression. A total 14 specimens were tested and the main parameters were the gap type (circumferential gap and spherical-cap) and gap ratio. The influence of gap on the failure mode and ultimate strength of CFST columns were experimentally examined.
Planning Explorations of Livable Community
Authors: Qian Feng
Published: June 2012

Because of the differences of natural geography, economy development, historical culture and traditional folk, the planning and design of livable community needs comprehensive consideration. This paper hopes to do some useful explorations to the planning and design of livable community by analyzing the planning and design of modern community.
Rational Development of Chinese Coastal City of Thinking
Authors: Wang Li Jun , Wang Hong Hai , Yu Ying
Published: June 2012

This paper based on the investigation of the Chinese coastal city. Problems for developers, such as the construction of excessive, unreasonable layout, lack of infrastructure, lack of expert guidance for analysis. Study from the planning and management, environmental features, architectural and cultural characteristics, sustainable development, the rational development of the Chinese coastal city, to seek the ideas of coastal urban development.
Potential Problems and Possible Solutions for Electronic Information Industry Development in Chongqing
Authors: Zhang Mei Hua , Xiang Xin Yi , Wu Qiang
Published: June 2012

Under the context of improving the world's ecological standards, the developed countries are making higher standards, which may lead to the traditional "high end" industry transferring to China and other developing countries, especially the industry which takes more subtle pollution or longer incubation period. In China, reflection after three decades of development in Guangdong and other pre-open areas may lead to these "high end" industries transfer to the developing area, such as Chongqing. From the example of four confrontations between Greenpeace and Hewlett-Packard, it can be found that the electronic information industry development may bring long-term worries. In this context, in order to avoid the "high end" industries development’s pitfalls, the electronic information industry in Chongqing must be conducted with a comprehensive system of research about its concealed or latent ecological and environmental worries of electronics industry.
Sea Sand Concrete Chloride Ion Diffusion and Combination of Curing
Authors: Chen Jian Bin , Zhang Guo Liang , Mo Li Wei , Liu Jun Zhe , He Zhi Min
Published: June 2012

The concentration of chloride ion in concrete has been an important part of the study of reinforcement corrosion, while the microstructure of concrete on the concentration of chloride ions play an important role, in order to evaluate the sea sand for ordinary concrete and fly ash concrete microstructure andmineral composition, we use the 28 days of age in sea sand Mohr method for the determination of the different types of water-soluble chloride ion concentration to the chloride ion binding characteristics in the study of sea sand in concrete
Technical Analysis on Business Model of Wenzhou
Authors: Jun Yan
Published: June 2012

Most Wenzhou firms are family owned or small stock holdings whose investors are relatives and friends. Business model in Wenzhou work to manage their industries as the second hand of the government. The business model in Wenzhou was organized by industries under the lead of local government. This paper gave us technical analysis on business model of Chinese Wenzhou.
Research on the Evaluation Elements of Post-Disaster Reconstruction
Authors: Xiang Ming Ming , Li Xiao Ning , Fu Juan Lin
Published: June 2012

Through case studies of Japan's post-disaster reconstruction, the author thought that Wenchuan earthquake reconstruction needed to evaluate. After researched and analyzed the situation and characteristics of the city's reconstruction in three represents which are the new county seat of Beichuan, Weizhou in Wenchuan and Dujiangyan City, the author proposed 10 selected evaluation elements, in order to supply a technical reference for building evaluation system and carrying out the evaluation.
Marginal Analysis of the HFCVs Industrialization: Commercialization Scale and the CO2 Emission Reduction
Authors: Ma Tao , Wang Jian , Chen Ming Qi , Song Yan , Ma Ping , Jiang Ming Hui
Published: June 2012

Focus on the hydrogen fuel cell vehicle industrialization barriers, the paper applies the marginal analysis into the CO2emission reduction of the HFCV. Based on the outputs of the GREET model, the CO2emission reduction amount of the HFCVs, the CO2emissions amount of HFCVs and the scale of the HFCV are calculated separately. Then we build the formulas of the above variables so that the marginal curve of the CO2emission reduction and the commercialization scale of HFCVs are mapped. The conclusion shows the marginal analyze could play a useful role in the CO2emission reduction estimation of the HFCV industrialization.
Research on the Intensity Formula of Recycled Concrete Based on Crushed Index
Authors: Jiang Yu Dan , Gai Guo Hui , Meng Wen Yan
Published: June 2012

In order to obtain the intensity formula of recycled concrete, effects of crushed index of recycled aggregate, crushed index of natural aggregate and replacement rate of recycled aggregate on compressive strength of recycled concrete are discussed in this paper. Based on the results of recycled concrete with different replacement rate of recycled aggregate, the intensity formula of recycled concrete is proposed. It can provide references for engineering applications.
A New Method of Mix Proportion Design of Ordinary Concrete - Data Analysis Method
Authors: Zhou Wan Liang
Published: June 2012

In the paper, through analyzing large quantity of concrete mix proportions, a law existing in all concrete with different mix proportions and good workability is found, i.e., the volume ratios of sands to binder linearly increase with the increase of the volume ratios of water to binder. Meantime a table of the mass ratios of sands to sands and gravels is given based on numerous concrete mix proportions. According to the table and the linear equation between the volume ratios of sands to binder and the volume ratios of water to binder, a new method of mix proportion design of ordinary concrete - data analysis method is proposed.
Experimental Research about Shrinkage of Cement Stabilized Gravel Base
Authors: Cheng Pei Feng , Zhou Xi Peng , Hou En Chuang
Published: June 2012

The semi-rigid base asphalt pavement has become the main form of high grade Highway pavement structure in China. But with changes in temperature, humidity and amount of traffic, serious cracking problems also exist in this pavement, affecting pavement performance. Analyses crack type of asphalt pavement and its causes, for serious reflection crack problem of semi-rigid base asphalt pavement, by on different structure type and different cement dose cement stabilized gravel mixture for indoor dry shrink and temperature shrink test research analyse variation law of its dry shrink strain, and dry shrink coefficient, and temperature shrink strain, and temperature shrink coefficient, ect. and provides basis to improve semi-rigid base asphalt pavement anti-crack performance.
Chloride Erosion on Calcium Silicate Hydrate Gel in Concrete
Authors: Zhang Jian
Published: June 2012

Fire does great harm to concrete structure's safety and applicability. And it should not be neglected that fire also does great harm to concrete's durability. Due to fire's high temperature and harmful product, concrete in the fire scene undergoes severe chloride erosion. The mechanism that affect fire's erosion on concrete is different from usual conditions, and it deserves further study on both erosion mechanism, influence factors, chloride erosion prevention measures, and the Calcium Silicate Hydrate decomposition under high temperature, which can be of significant meaning in concrete structure damage evaluation and effective structure maintenance and reinforcement after fire.
Research on Influence of Chloride Ion in Sea Sand on the Performance of Concrete
Authors: Zhang Guo Liang , Mo Li Wei , Chen Jian Bin , Liu Jun Zhe , He Zhi Min
Published: June 2012

Sea sand concrete is a kind of concrete in which mixed sea sand as fine aggregate, which is large-scale application in the coastal areas in recent years, especially in Ningbo area. The sea sand solves the problem of river sand shortage, coupled with cheaper price, most of the ready-mixed concrete companies are willing to use desalted sea sand instead of river sand. Many companies even are using sea sand without any treatments.In Ningbo sea sand concrete using wide range of usage is not optimistic. This survey and analysis in Ningbo area physical characteristics of concrete using sea sand and sea-sand. On this basis, chloride simulating sea sand, mixed with desalted sea sand, not desalted sea sand mortar strength measurement, the concrete strength rule were analyzed, and discovered the early strength for the sea sand concrete by the presence of chloride.
Preparation and Evaluation of Controlled Expansion of the Sealing Agent KP
Authors: Wang Ping Quan , Qian Zhi Wei , Miao Juan , Bai Yang
Published: June 2012

The water absorbent resin is a new type of polymer plugging materials developed in recent years, the water swelling with certain viscoelastic gel, with a certain intensity, strong water retention, salt resistance and stability. Polymerization aqueous solution of acrylic acid (AA), acrylamide (AM) as the experimental materials, the choice of a controllable expansion sealing agent the KP to determine the formula developed by the sealing agent, and has good suction rate, anti-performance of salt and water retention.
Hydrothermal Synthesis and Characterization of BiFeO3 Polyhedral Crystallites
Authors: Yang Lin Lin , Wang Yong Gang , Wang Yu Jiang , Wang Xiao Feng
Published: June 2012

BiFeO3 polyhedrons had been successfully synthesized via a hydrothermal method. The as-prepared products were characterized by power X-ray diffraction (XRD) pattern, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The possible mechanisms for the formation of BiFeO3 polyhedrons were discussed. Though comparison experiments, it was found that the kind of precursor played a key role on the morphology control of BiFeO3 crystals.
Influence of Manufactured Sand Grading to Workability of Concrete
Authors: Li Fu Hai , Gao Jin Liang , Li Gu Hua , Yu Chuan
Published: June 2012

In order to apply manufactured sand in the field of concrete engineering, the workability of concrete influenced by manufactured sand grading is studied. The test shows that whereas the grading of sand satisfy the code sand grading standard regions, the workability of concrete with them are significantly different. The grading with stretch shapes “S” form is much better than that with stretching like opposite “S” form or parabola.
Characteristics of Colored Topaz through a New Surface Treatment
Authors: He Xue Mei , Shen Li Xuan , Wang Hai Yan , Wang Wei Wei
Published: June 2012

To find out the characteristics, color’s genesis and identifying features of TCF (Thermal Color Fusion) topaz, and the differences between TCF topaz and the past coating topaz products, this article takes TCF topaz, which appeared recently in the market, and two other common generation of coatings topaz sample as the object of study, and use a variety of gemology testing instruments and wide spectrum and narrow spectrum of X-ray photoelectron spectroscopy to analyze the gemology feature, surface structure and composition of the sample, the results shows that: the difference of the surface layer composition is the basic reason for the color difference of these samples, but the film structure and thickness of the sample do not have a big impact to the color. This article has also carried on the examination to the sample durability, at the same time analyzing and comparing a variety of optimized topaz production process. The TCF topaz technology has the advantages of both two kinds of process of coating and the diffusion, TCF topaz is rich in color compared to diffusion and irradiation product, it is better than irradiation product on high temperature resistance and radioactive residues.
The Thermal Stress Analysis on Stress Absorption Interlayer of Asphalt Overlay
Authors: Xue Peng Tao , Wang Xiu Shan
Published: June 2012

By using finite element method, the thermal stress of stress absorption interlayer of asphalt overlay on the cement concrete pavement is analyzed in this paper. The result shows that the inter-laminar shear stress and the structural vertical displacement are influenced by the thickness of stress absorption layer, while the asphalt bottom stress is less affected; the increase of the modulus is unfavorable to the structural vertical displacement, the inter-laminar shear stress and the asphalt bottom stress.
Study on Corrosion Resistance Coefficient Assessment Method for Sulfate Resistance of Cementitious Material
Authors: Gu Kun Peng , Wang Cheng Qi
Published: June 2012

By means of testing corrosion resistance coefficient of different cementitious material under the sulfate corrosion experimental conditions, sulfate resistance of cementitious material and assessment method are studied. The results show that 90d is proper corroded age for assessment sulfate resistance of cementitious material by corrosion resistance coefficient method, and the assessment method is put forwarded. Sulfate resistance of cementitious material can be divided into five classes according to corrosion resistance coefficient assessment method as follows: “very low”, “low”, “moderate”, “high” and “very high”. The sulfate resistance of Portland cement is better than ordinary Portland cement, and both of them are low. Mineral admixture with proper content can improve sulfate resistance of cementitious materia largely, but do not always available to all content. Sulfate corrosion mechanism of different kinds of cementitious material is analyzed.
Effect of Cu Doping on the Conductivity of Individual ZnTe Nanowires
Authors: Meng Qing Fang , Wang Fang , Yang Zai Ming
Published: June 2012

The effect of Cu doping on the conductivity of individual ZnTe nanowires was investigated. Cu was diffused into ZnTe nanowires during the heat treatment process. Cu content was controlled by the thickness of Cu layer sputtered on the top of ZnTe nanowires. I-V curves of Cu doped ZnTe nanowires have been tested by four-terminal measurement. The results indicate that the conductivity of Cu doped ZnTe nanowires is effectively improved. When Cu content doping in ZnTe nanowires reaches 17.5%, there is about five orders of magnitude improvement in the conductivity of Cu doped ZnTe nanowires, compared with undoped ZnTe nanowires.
Experimental Study on Effect of Heating Time on Polyurethane Foam Smoldering Propagation
Authors: Lu Chang , Li Hui Hui , Zheng Yan Min , Liang Yuan Qing
Published: June 2012

Polyurethane foam is an important branch of building insulation materials, but its poor fire performance easily to lead to smoldering. This is conducted under condition of natural convection and heating time change of smoldering experiments on the smoldering experimental compartment. Use the thermocouple to measure the temperature changes inside the material. The results shows that, the heating time is shorter, smoldering into flame combustion is less complete, when time is short enough, smoldering extinguished; and in the vertical smoldering propagation, as time is shortened, smoldering into open fire’s position is upward. Experiment and analysis can be nicely displayed the effect of heating time on smoldering process.
Experimental Research on Reinforcing Effect of Spiral Steel Fiber
Authors: Zhou He Ting
Published: June 2012

Steel fiber has a fine nature in reinforcing concrete. This essay aims to find out the influence of physical forms of steel fiber on its nature of reinforcement. By comparing two types of cement mortar reinforced by steel fibers, it is found that spiral steel fibers have a better bond strength with matrix than straight ones. Therefore, a conclusion could be drawn that physical forms of the steel fiber play a significant role in steel fiber reinforced concrete, and the experiment also serves a rewarding reference to the application of spiral steel fibers.
Study on Physical Properties of Cement Filling Material by Ore Tailing
Authors: Chen Chao , Gan De Qing , Guo Zhi Ling , Zhang Ya Bin
Published: June 2012

According to the occurrence of ore, mining use different cement filling mining, due to different filling body, in a different role in the maintenance of stope stability, so filling body required different strength. By regression analysis of filling body strength with sand ratio, slurry concentration and fine sand content, to get different body strength of different filling mining, and also can be the primary and secondary and the impact degree of various factors which impact the strength of filling body.
Synthesis, Characterization of Novel π-Conjugated Oligomers for Photovoltaic Applications
Authors: Sun Xiao Xia , Zhuang Xiao Xiao , Hu Yu
Published: June 2012

Heterocyclic monomers based on 2,1,3-benzothiadiazole bearing solubilizing side chains have been synthesized in high yields over four steps from readily available starting materials. The new dificient acceptor has good solubility in organic aolvents to permit an appropriate coating process. Two soluble donor-acceptor π-conjugated oligomers comprising electron-rich thiophenes the electron-deficient EDOBT have been carefully investigated.
Seismic Experiments for Multi-Ribbed Sandwich Insulation Composite Wallboard
Authors: Yue Ya Feng , Huang Wei , Zhao Dong
Published: June 2012

Low frequency cyclic horizontal load experiments have been carried out on the sandwich insulation (ECW-8) and ordinary (ECW-1) multi-ribbed composite wallboard. Mechanical properties of two specimens such as bearing capacity, energy dissipation and failure modes were studied. Two specimens are both shear failure. The cracking load of insulation wallboard increases by 29.1% than ordinary wallboard. The initial stiffness of insulation wallboard is 1.38 times of ordinary wallboard. The ultimate bearing capacity and energy dissipation performance has little difference between them.
Design of Unbound Pavement Layer Materials Based Upon the Shakedown Concept
Authors: Boulbibane Mostapha , Ali Mohamed Abdullahi
Published: June 2012

This study aims to introduce an alternative design method for unbound pavement layer materials based upon shakedown theory. The kinematic shakedown theorem that describes the ultimate response of an elastic/plastic structure to cyclic loads is used to predict whether stable behaviour in the unbound granular materials layer occurs or excessive rutting will develop. This method seeks the mechanism, from within a class of mechanisms that minimises the shakedown limit load for pavements consisting of layers of Mohr-Coulomb material obeying the associated flow rule. The basic concepts are outlined together with the most recent calculations of the critical design shakedown load. The influence of the of design parameters such as, the strength, stiffness and depth of the base-course material as well as the consequences of load distribution are discussed.
The Application of Titanium Dioxide of Environment-Friendly Building Materials
Authors: Chen Fu , Xu Yong Zhi
Published: June 2012

The applications and effect of titanium dioxide are investigated in the aspects of coating,cement, concrete, wallpaper, glass, porcelain and PVC profile, from a perspective of environment-friendly building materials and according to the characteristics of structural materials and decorative materials. We should consider several problems caused by improper use of titanium dioxide among environment-friendly building materials and proposes that related standards that be established, titanium dioxide technology development,adjustment, control of different size and size distribution be focused on, and meet the needs of the client in the end
Experimental Study of Shear Properties of the New Wall Materials
Authors: Hu Feng , He Chao Chao , Xu Min
Published: June 2012

Based on the experimental study of the shear performance of three brand-new types of masonry brick wall and through the comparison of their shearing resistance by examining respective intrinsic factors, this essay aims to provide some reliable mechanical properties of these wall materials for their practical application in engineering and moreover offers some basic references for their popularization and application.
Freeze/Thaw Durability of Carbon Fiber Reinforced Concrete
Authors: Yuan Xin , Zhu Guo Hua , Yu Liang
Published: June 2012

An increasing trend towards the demand for resisting to Freeze/thaw exposure has led to fibers being incorporated into concrete. This paper addresses the freeze/thaw durability of carbon fiber reinforced concrete by using a paired comparison test based upon relative dynamic elastic modulus and the rate of loss mass. The carbon fiber reinforced concrete was found to be more durable than plain concrete probably due to the high elastic modulus of carbon fiber. Durability is an important material property and carbon fiber reinforced concrete needs to be widely tested to gain confidence for use within the industry and this work shows future possibilities.
Surface Modification Research for Asphalt Mixture Filler
Authors: Li Jing , Zhang Ai Qin
Published: June 2012

Titanate coupling agent can modify the surface of inorganic filler and promote adhesion property of asphalt mortar. Moreover, it can also improve asphalt performance and pavement performance of asphalt mixture effectively, and reduce optimum asphalt content of mixture.
Experiment Study of BFRP Bars’ Mechanical Properties
Authors: Huo Bao Rong , Zhang Xiang Dong
Published: June 2012

The testing rule of mechanical properties of material can be established and the mechanical performance can be found by studying the basic mechanical properties of BFRP bars. Using the opressive sleeve anchor developed by the researchers,tensile tests of BFRP bars are carried out according to the national standards of “GFRP bar tensile test methods”.The BFRP bar’s force-deformation curve is linear before the force-deformation relationship is destroyed,therefore,referring to steel wire or steel cable,the BFRP bar’s reliable strength is suggested to be approximately 80% of its ultimate tensile strength. The BFRP bar’s tensile elastic modulus is related to the content of basalt fiber.The tensile elastic modulus increases with the increase of the basalt fiber’s content and the content increases when the BFRP bar’s diameter becomes longer, so the tensile elastic modulus increases with the increase of its diameter. Compared with steel, the BFRP bar is obviously superior in the aspects of tensile strength, corrosion resistance ,etc,therefore to use the BFRP bar in reinforced concrete structures insead of steel is feasible.
Study on the Technology and Properties of Soybean Adhesive Bonded Laminated Veneer Lumber from Poplar Wood
Authors: Li Wen Ding , Zhang Yang , Liu Cong , Nguyentrong Kien , Jia Chong
Published: June 2012

It was investigated that the technology of hot prepressing temperature and hot pressing duration had influence on the mechanical and physical properties of soybean adhesive bonded laminated veneer lumber(LVL) from poplar wood. The results show that lower mat prepressing temperature may be beneficial to the mechanical properties of LVL. The effects of hot pressing duration on the properties of LVL are less than those of prepressing temperature. When the prepressing temperature is 70°C and hot pressing time is 100s/mm with glue spread amount of 450g/m2, hot pressing temperature of 160°C and mat pressure of 1.6 MPa, the mean modulus of rupture value is 78 MPa, mean modulus of elasticity value is 14.4 GPa, mean horizontal shear strength value is 7.8 MPa and immersion peel rate is 0.4%, respectively.
Novel Poly (vinyl Alcohol) Nanocomposites Reinforced with Nano Cellulose Fibrils Isolated from Plants by Mechanochemical Treatment
Authors: Hu Yue , Li Da Gang , Deng Qiao Yun , Wang Yu Mei , Lin Dong Liang
Published: June 2012

The objective of this study was to reinforce biodegradable polyvinyl alcohol (PVA) with nano cellulose fibrils generated from poplar and cotton through mechanochemical treatment. A method used a combination of acid and alkali treatment to obtain cellulose from poplar and cotton. The cellulose of both fibers was further processed by grinder treatment. PVA/nano cellulose composite was prepared successfully by an immersion method. The cellulose nanofibers and nanocomposite films were characterized with scanning electron microscope (SEM), tensile testing machine, ultraviolet-visible spectrophotometry (UV-vis). SEM showed the diameter of the cellulose was range between 30-100 nm and exhibited a high aspect ratio of over 1500. The mechanical properties of PVA were improved significantly and the two plant nanofibers had the similarly reinforcing effects in the matrix. Cellulose nanofibers as a future resource have tremendous potential since they are one of the most abundant organic resources on the earth.
Research on Preparation and Properties of Cellulose Nanofibers and its Polymethylmethacrylate (PMMA) Based Nanocomposites
Authors: Chen Zhen Dong , Li Da Gang , Xu Li , Wang Yu Mei , Lin Dong Liang
Published: June 2012

In this work, the preparation and properties of cellulose nanofibers (CNFs) which have a diameter of less than 100 nm, CNFs sheet and PMMA based nanocomposites sheet were presented. To fabricate CNFs, chemical treatments combined with grinding treatment were used in this research. The CNFs sheet was successfully fabricated by vacuum filtration, and to fabricate the PMMA based nanocomposites sheet, the CNFs sheet was immersed in the PMMA solution, and cured by heat. The tensile strength and Young’s modulus of CNFs sheet is 64.9 MPa and 4438 MPa, respectively. Due to the reinforcement function of CNFs, the tensile strength and Young’s modulus of neat PMMA sheet is improved by 60% and 190%, respectively. The light transmittance of CNFs sheet and PMMA based nanocomposites sheet is 82.1% and 89.2%, respectively.
Optically Transparent Nanocomposite Based on Cellulose Nanofibers from Newspapers and Polyurethane
Authors: Li Xue Ting , Li Da Gang , Xu Li , Wang Yu Mei , Lin Dong Liang
Published: June 2012

The goal of this paper was to develop an optically transparent nanocomposite with high strength by reinforcing polyurethane (PU) with cellulose nanofibers (CNFs) extracted from newspapers. The FE-SEM images show that through chemical and mechanical treatments, newspaper CNFs with diameters ranged from 20 to 100 nm and an aspect ratio of over 1000 were successfully obtained as well as wood powder. They were cross-linked together and formed a special three-dimensional network structure. The nanocomposite was fabricated by impregnating the CNF sheet into transparent PU resin and cured under ultraviolet. Results demonstrate that the transparency of newspaper CNF/PU nanocomposite was as high as wood CNF/PU nanocomposite. The elastic modulus and tensile strength of newspaper CNF/PU composite were increased roughly eighteen times and two times respectively while retaining the high transparency of PU, which was nearly the same with wood CNF/PU composite.
On early Properties of High Performance Spray Material
Authors: Lin Yue Zhong
Published: June 2012

This text used double fast cement, and fly ash, and high performance polymer and fiber for main material and plus agent for has high performance spray material of preparation and research, by distribution out of material has following advantages: condensation time fast, and short-term and late strength high, and dry shrink volume minimal, and stick poly sexual strong, and waterproof, and back bomb rate small, and seal performance very good, and has must of flexible, and using range wide.
Green Roofs System with Porous Ecological Concrete
Authors: Quan Hong Zhu
Published: June 2012

Because of its durability and strength, more and more porous concrete has been used for riverbank protection or foundations of greenery. This study described a new type of green roof system without a soil layer on the porous concrete. This paper also discussed reuse of waste (fly ash generated from thermal power stations and aggregate made of ALC panel waste) to configure a newly proposed thin-type green roof system. As a result, the pilot model of lightweight thin type porous planting foundation satisfied the dynamic strength and ensured 30% void ratio needed for viability of vegetation.
Characteristics of Cold-Bonded Lightweight Aggregate Produced with Different Mineral Admixtures
Authors: Bui Le Anh Tuan , Hwang Chao Lung , Chen Chun Tsun , Hsieh Meng Ying
Published: June 2012

Cold bonded lightweight aggregate (LWA) was produced by adding 0%, 25% and 50% granulated blast furnace slag (GGBS) or rice husk ash (RHA) to fly ash (FA) by the pelletization process with cement additives. The results show that GGBS addition significantly improved the crushing strength of LWA, whereas there was no effective on crushing strength of LWA when RHA was used. GGBS addition significantly reduced the water absorption of LWA; on the contrary, effect of RHA was to increase the water absorption. Unit weight of LWA added RHA was in range of 719-903 kg/m3, while that of LWA added GGBS was in range of 918-1082 kg/m3. High performance lightweight concrete (LWC) made with the selected LWA (60% FA + 40% Cement and 30% FA + 40%Cement + 30%RHA) had unit weight lower than 2000 kg/m3. The 28-day compressive strength of the LWC was in range of 49 to 57 MPa. The results of the electrical resistivity and ultrasonic pulse velocity tests indicate that the LWCs might be considered to be durable concrete.
Study on Preparation of ZnO-TiO2 Composite Photocatalyst and its Properties
Authors: Liu Zi Quan , Jiang Fu Yi , Liu Rui Cui
Published: June 2012

Using titanyl sulfate and zinc sulfate and others as the main resources, we adopted separately sluggish precipitation method and co-precipitation method to prepare pure TiO2 nano-powder and ZnO-TiO2 nano-composite photo-catalytic materials. The authors used X-Ray Diffraction (XRD) to research crystal types of the TiO2 nano-powder and ZnO-TiO2 nano-composite photo-catalytic materials, and conducted experiments of photo-catalytic performance and light absorption performance of the samples that were made. The experiment results showed that the prepared TiO2-ZnO nano-composite photo-catalytic materials are relatively ideal. The paper used visible light as the light source to realize the effective degradation of the organic matters.
Factorial Analysis of Heavy Metal Concentration in Roadside Farmland Plants around Kathmandu, Nepal
Authors: Zhang Man , Yan Xue Dong , Zhang Fan , Zeng Chen , Devkota Lo Chan Prasad
Published: June 2012

Traffic activities are one of major sources leading to roadside soil contamination due to their long-term accumulation effect. The typical elements of Cd, Pb, Zn, and Cu in the roadside soil can transport through food chain to human body and result in a strong toxicity to people. In agricultural area, intake of heavy metals through the soil-crop system could play a predominant role on human exposure to environmental heavy metals. The study investigates concentrations and distributions of the four heavy metals’ in herbaceous plants growing in the roadside farmland around Kathmandu, Nepal. Totally, 60 plant samples including 26 samples from rural mountainous farmland and 34 samples from suburban farmland were collected from April 2011 to May 2011. The sampling distances to the road edge are 0 m, 10 m, 30 m, 50 m, and 100 m. The samples are classified into tree protection or no tree protection. It is found that the heavy metals’ distributions are not consistently decreasing as roadside distance; the heavy metal concentration in rural area is significantly lower than those in suburban area; and tree has a significant protection effect on roadside plants from the Cu contamination.