bluuebunny/crossref_metadata_2025 huggingface dataset:
The Improvement on the Determining Method of the Proper Pile Length in the Collapse Loess
Authors: Zhao Gen Sheng , Wei Wei , Zhou Huan Tao , Zhang Qi
Published: August 2013

In Consideration of the nonlinear of the soil and the interface between pile and soil, the spatial axisymmetry finite element model is established. Based on the model, the paper offers the Superposition Method to calculate proper pile length in the self-weight collapse loess , and gets the following deduction: when the upper and lower parts of soils skin friction has the same regularity, added pile length L has nothing to do with the skin friction distribution, but is related to ultimate friction resistance. Practical application shows that the method is effective and can be referenced in engineering practice.
Analysis and Evaluation of Stability for the Landslide of Suoertou
Authors: Li Hai Jun , Zhang Hui Qing
Published: August 2013

As one of the most familiar and serious danger geological hazard. Slope has caused huge life and property losses of our country and people. So it is necessary to analyze the stable state when facing serious landslide hazards, and giving a reasonable evaluation. Taking Suoertou landslide as an example In this paper, on the basis of investigation and study, general situation of Suoertou landslide is introduced, then the stable state is analyzed, calculated and evaluated, the conclusion is a depend basis for later treatment.
Stability and Deformation Analysis for Excavation and Backfilling of Fushun West Open-Pit Coal Mine
Authors: Yan Yong Cheng , Ling Xian Zhang , Zhang Feng , Wang Jia Hui
Published: August 2013

Taking section W400 of Fushun west open-pit coal mine for the research, the interface model of fracture zone and surrounding rock was established. FLAC3D is used to analysis the influence of excavation and backfill of open-fit coal mine to the slope stability and deformation. The numerical results and analysis show that: (1) when the open-pit coal mine slope is excavated to final production line, the safety coefficient is 2.98, with the excavation, the deformation of the Fushun No.1 Refinery Factory area increases. (2) With the increase of backfilling, the slope coefficient increases to 3.32, this will reduce the deformation of the Fushun No.1 Refinery Factory area. Furthermore, the positions of the dangerous slip surface and serious deformation part of factory area should be regards as key areas. These conclusions could provide technical basis for the stability analysis of Fushun west open-pit coal mine.
Experimental Study on Shear Strength of West Sichuan Unsaturated Mixed-Soil
Authors: Cui Kai , Huang Bang Wen
Published: August 2013

By controlling moisture content to control matrix suction indirectly, three typical unsaturated remolded mixed-soil from west Sichuan are studied by the consolidated untrained triaxial shear test .The test data show that for different kinds of soil samples, the sample with less amount of clay and high content of quartz has bigger internal friction angle relatively, and the sample with hydrophilic mineral and high content of clay has bigger cohesive force. Meanwhile, for the sample without or less hydrophilic mineral, cohesive force is affected mainly by water content, and for the sample with large content of hydrophilic mineral, water content and dry density affect cohesive force together. For a certain sample, the variation of moisture content and dry density affects internal friction angle less, while affects cohesive force more. In addition, the change of internal friction angle resulting from the variation of matrix suction is less, and cohesive force increases as matrix suction increases.
Numerical Simulation of Mechanical Properties of Reinforced Red-Sandstone Granular Soil Based on 3D Discrete Element Method
Authors: Jiang Jian Qing
Published: August 2013

Red-sandstone granular soil reinforced with gabion-mesh is a new concept of composite reinforced soil. In order to reveal the mechanical properties of this composite reinforced soil, a series of laboratory triaxial compression tests on specimens reinforced with gabion-mesh were carried out, and 3D discrete element method was introduced to simulate the triaxial tests. The macro stress-strain relation of red-sandstone specimens reinforced with gabion-mesh was reproduced by the 3D discrete element model. The results show that 3D discrete element method is an ideal technique to study the meso-mechanical nature characteristics of gabion-mesh reinforced red-sandstone granular soil.
Evaluating the Bearing Capacity of a Soil Layer Overlying Rigid Substratum Using a Modified Failure Mechanism Based on Limit State Analysis
Authors: Afshar-Mazandaran Reza , Khabbaz Hadi
Published: August 2013

The bearing capacity of shallow foundations resting on a soil layer with a finite depth over bedrock has been studied for years by many investigators. Farzaneh et al (2010) introduced a rigorous bearing capacity analysis based on the upper bound state theorem, using a log-spiral surface algorithm. This paper presents a thorough evaluation of this collapse mechanism and subsequently, a modified failure mechanism is introduced. The collapse mechanism consists of rigid blocks under combined rotational and transitional movements. The effects of the loading parameters on bearing capacity results are then discussed. The findings of this study are compared with the original limit state mechanism as well as previously published solutions, emphasising the accuracy and efficiency of the modified mechanisms. Furthermore, parametric studies are carried out to evaluate the ultimate bearing capacity of shallow foundations resting on a restricted soil, layer using the proposed mechanism. Design tables are finally presented for practical use in geotechnical engineering.
Study on the Deformation Forecasting for the Tunnel Surrounding Rock Using the Neural Network
Authors: Wang Guo Feng , Zhao Wen , Guan Yong Ping , Liang Lei
Published: August 2013

The non-pillar sublevel caving method is used in Iron Mine in Banshi. In the mining area, there are many folds and faults, the inclination of ore body changes greatly, and ore and rock are fragmentized. The tunnel often collapsed and the surrounding rock deformation was getting large during the construction stage. Using the data of tunnel surrounding rock deformation, we adopt the neural network method to set up the mapping relation between the tunnel surrounding rock deformation and the project factors, including tunnel deepness, tunnel dimension, measuring time and surrounding rock quality. The analyzing results show that the maximum error between the forecast and the testing data is 13%, which indicates that this method is useful and feasible to the mining engineering. Key words: rock pressure; measure, deformation of the tunnel surrounding rock; neural network; data normalization; mapping
Finite Element Analysis of One Dimention Large Strain Consolidation of Clays with Variable Compressibility and Permeability
Authors: Hai Ying , Chen Jing Yu
Published: August 2013

The coefficient of compressibility av and the coefficient of permeability kv of clays decrease during the one dimention consolidation process, especially when the strain of clays in the process are large. This paper studies the effects of large strain, decreasing compressibility and decreasing permeability during the one dimention large strain consolidation process by analyzing results obtained from the nonlinear finite element method and comparing with results from the conventional consolidation theory. The research results of this paper shows that the compression index Cc and the permeability change index Ck are two important clay parameters which influence one dimention large strain consolidation process.When the instantaneous load increment remains unchanged, the larger the value of the Cc , the larger the value of the final settlement and the slower the settlement development; the larger the value of the Ck, the faster the dissipation of excess pore water pressure in one dimention large strain consolidation process.
Waterproof and Drainage Diseases of Subgrade and its Prevention Measures in Loess Donga
Authors: Liu Li Ping
Published: August 2013

Directed against the special nature conditions in loess donga, topography and geomorphology, meteorology, foundation soil and subgrade section type, pavement design and construction, drainage facilities design, construction and maintenance and other reasons caused drainage damages were analyzed. Combined with current maintenance specifications, subgrade drainage maintenance technology after construction and damage prevention measures of loess donga are brought forward.
Method for Calculating Active Earth Pressure of Retaining Wall Based on Energy Theory
Authors: Wang Dai , Wang Yong Zhi
Published: August 2013

Calculation methods for active earth pressure of retaining wall are analyzed and discussed, and then based on energy conservation principle, one formula about calculation of active earth pressure was deduced which was illustrated with two engineering examples. The results suggest: compared with other limit equilibrium method, this method is closer to practical action and relatively simple, and is applicable to any case calculation for active earth pressure of wall retaining, so has high promotion value.
Optimization Design of Coupling Beam of the Frame Double-Row Piles
Authors: Shen Yong Jiang , Cui Hai Hao , Deng Biao , Kang Wen
Published: August 2013

Double-row piles are often used for the large-scale landslide control. The frame double-row piles are the common types. Coupling beam is an important component of frame double-row piles. It plays an important role in transferring landslide thrust. A finite element model of landslide was established to evaluate the effect of section size and length of coupling beam on the internal force of double-row piles. It was found that the internal force of double-row piles increased with the length of coupling beam, and found that it was unfavorable for the moment distribution of double-row piles if the section size of coupling beam was too large or small. Therefore, the reasonable length of coupling beam is equal to the height of the piles section. With the reasonable moment distribution of double-row piles, the section size of coupling beam has an optimum value.
Dynamic Triaxial Test Research of Stage Change of Cohesive Soil
Authors: Rong Xiao Yang , Yang Tian Hong , Wang Pei Tao , Wang Hong , Li Yang
Published: August 2013

With the STX-50 pneumatic-typed dynamic triaxial system, the undrained dynamic triaxial tests on the saturated cohesive soil are performed to study the dynamic strength properties. The changing process of the dynamic strength, backbone curve and the soil deformation of the cohesive soil under dynamic load are zoom analysis by stages to get their regularity. It is found that the stage change of the dynamic strength, backbone curve and the soil deformation all exist, which the stage I of the soil deformation has little damage, the stage III is not allowed, the stage II is determined by the importance of the concrete and the sensitive degree to the deformation. In order to analysis the deformation stability and stress stability of the formation in the effect of the dynamic load, provide qualitative and quantitative basis for the soil dynamic study.
Control on Reasonable Impact Loading in Static-Dynamic Drainage Consolidation Method
Authors: Li Zhang Ming , Qian Xiao Min , Zeng Wen Xiu , Liu Jin Wei
Published: August 2013

Based on the engineering tests of muck ground treatment project, the contact stress control valuePmaxf of muck ground is derived and the maximum allowable stress ratio R is defined according to the basic consideration of the muck ground pressure is greater slightly than the bearing capacity characteristic value of muck foundation for many micro fractures can be formed and the ground could keep whole stability at same time. The R and Pmaxf can give the reasonable value of the impact loading in static-dynamic drainage consolidation method (SDDCM). It is an effective way to avoid the failure in design and construction as well. In addition, R is the parameter to judge the reinforcement effects of muck foundation. The results of this paper were applied to actual engineering projects and the engineering test data showed the application effects are very good.
Dig-Hole Pile Excavation by Blasting in Cities and Towns
Authors: Zhang Zhi Yu , Luan Long Fa , Li Xiang Long , Zhang Li Guo , Guan Si
Published: August 2013

In order to avoid dig-hole pile excavation blasting effect the building structure safety and the life of residents around the project, take several controlled blasting technique measures in construction. Through taking reasonable arrangement of holes, delay time, specific charge, initiation ways and safety protection measures, and blasting vibration was measured and analized to guide blasting operations, finally the purpose of excavation blasting was achieved safely. The results show that several controlled blasting techniques used in the project are effective measures, not only ensure the good blasting effect but also control the influence of blasting vibration to surroundings, and provide valuable references to similar projects.
Response Law and Influencing Factors of the Soil under Action of Pile Driving Vibration Based on Midas/GTS
Authors: Zhang Dong , Su Jing Bo , Zhao Hui De , Wang Hai Yan
Published: August 2013

Due to the upgrade and reconstruct of a high-piled wharf, the piling construction may cause the damage of the large diameter underground pipe of a power plant nearby. For this problem, a dynamic time-history analysis model was established using MIDAS/GTS program. Based on the analysis of the pile driving vibration and its propagation law, some parameters, such as the modulus of the soil, the Poissons ratio of soil, the action time of vibration load and the damping ratio of the soil that may have an effect on the response law of the soil, were studied. The study results not only serve as an important inference to the construction of this case, but also accumulate experience and data for other similar engineering practices.
The Spatial Block Stability Test in Variable Angles and Safety Evaluation
Authors: Wang Jiang , Wang Shu Hong , Jiang Lei , Ni Yong
Published: August 2013

Joints information in specific rocky slope free face could be collected by modern untouched measure technology in engineering. Possible key blocks are displayed after system analysis. Experiment spatial blocks and structural planes dimensional angles can be changed with the variable angle space test platform, lead to reaching the target that position of spatial blocks are simulated, which suggests the secure stability of spatial blocks. Least square data fitting method is used according to experiment data-the two slide angles and failed mode. Security assessment is proposed and numerical method is applied to testify the experiment results.
The Performance Evaluation of Glass Fiber Reinforced Concrete (GFRC)
Authors: Koo Bon Hak , Yoon Bok Mo
Published: August 2013

This study is intended to propose the performance standards and performance test standards of artificial rocks through investigation of standards, guidelines and other literature home and abroad, testing, and site-survey. As a result, the selected performance requirements include a total of 15 items: structural safety (flexural, compressive, impact strength), durability (crack, corrosion resistance, fire resistance), landscape (texture, discoloration, color), environmental load reduction (CO2 reduction rate, materials recycling rate, water quality and soil), and ecological performance (biodiversity, ecological similarity, ecosystem function damage reduction).
On the Application of Green Ionic Liquids in the Preparation Process of the Gel-Type Wood Composites Materials
Authors: Li Xiu Rong , Liang Bing Zhao , Li De Hua , Na Liu , Yin Xiao Na
Published: August 2013

Due to the excellent physical and chemical properties of low melting point, high stability, low vapor pressure, and adjustable solubility, the ionic liquid is widely used in the dissolution of cellulose, regeneration and applied research. This thesis selects the ionic liquid to dissolve the wooden ponder in the processed wood residues and observes its dissolution behavior including the dissolution process of the cellulose in the ionic liquid and the cellulose dissolution as well as its regeneration mechanism. It turns out that the chemical structure of successfully prepared gel-type wood composite material does not changes and its microstructure retains a complete timber microscopic structure. For the fiber bundle formed after the celluloses dissolution, one part functions as the support skeleton, another forms a closed three-dimensional crosslinked network, which possesses stable chemical and physical properties. The gel-type wood composites owns suitable visual characteristics, which can render the "natural", "comfortable", "simple and elegant", and "crisp" visual psychological impression.
Research on the Method of Architecture Design Idea
Authors: Cui Hai Hong
Published: August 2013

This paper give the comment on the status on the current architecture and the analysis of the foundation. Expatiate on the architecture conceptions basing on the functions, emphasizing on the environments and advanced techniques. And search for some methods to settle the problems of similar architectures base on the status and analysis. It is hope to cause the society and some professionals' attentions on the problems of current architecture.
Impact Experimental Research on Hybrid Bamboo Fiber and Steel Fiber Reinforced Concrete
Authors: Wang Xian Dong , Zhang Chang , Huang Zhen , Chen Guo Wei
Published: August 2013

This paper studied experimentally the impact mechanical properties of bamboo fiber and hybrid steel fiber reinforced concrete. Steel fiber is already used in construction widely, but it is expensive in cost. As a kind of green building material, bamboo fiber can be used in the infrastructures together with concrete to improve the concretes mechanical properties. In order to investigate the impact mechanical properties of concrete reinforced with bamboo fiber and steel fiber, a series of concrete specimens reinforced with bamboo fiber, steel fiber or both steel fiber and bamboo fiber are investigated with self-designed impact device. The impact resistance abilities are tested and compared.
The Development of Green Building Materials Trend in China
Authors: Sheng Bao Zhu
Published: August 2013

Building material is the base of civil engineering construction, in the history of thousands of years of development, building materials also gradually change and change, and is closely related to the progress of human civilization and the development of science and technology.Green building materials has the vital significance to the construction of a conservation-oriented society and sustainable development, in accordance with China's social development.This paper introduces the importance of the development of green building materials,analyzes some factors influencing the development of green building materials in China,and discusses the development tendency of green building materials in China.
Application on the Sprayed FRPC in Engineering
Authors: Sun Cheng Fang , Zhu Wei Chao , Gu Qian
Published: August 2013

The spayed fiber reinforcement polymer concrete (FRPC) is a kind of new composite material and construction methods, combining good characteristics of the spayed concrete with FRPC. The spayed FRPC widely applied into civil engineering, water project, buildings, road and bridge, and repairing and strengthening various contractures, which obtained engineering success and economic benefit. Firstly, the physical and mechanical performance of sprayed FRPC is introduced. Secondly, applications on sprayed FRPC are summarized in engineering at home and abroad. At last, some advices for application and development of spayed FRPC technology in China are given.
Basic Mechanical Properties of Concrete with Machine-Made Sand and Recycled Coarse Aggregate
Authors: Zhao Shun Bo , Guo Qi , Li Guang Xin , Su Yan Feng
Published: August 2013

Experimental study was carried out on the concrete mixed with machine-made sand and recycled coarse aggregate (MSRAC), three strength grades of concrete were designed by changing the water to cement ratio as 0.36, 0.45 and 0.55, while the sand ratio varied in a range of 32%~38%, 32%~42% and 38%~44% successively. The workability and the mechanical properties such as compressive and splitting tensile strengths and elastic modulus of MSRAC were tested. The results show that although the mechanical properties of MSRAC were influenced by sand ratio, they were still controlled by the water to cement ratio. The ratio of axial compressive strength to cubic compressive strength and the elastic modulus of MSRAC basically satisfy the specifications of the current design code for concrete structures. It should be noticed that the tensile strength of MSRAC is lower than current specification, and tends to reduce with the increase of water to cement ratio.
The Innovative Design of the New Countryside Residential Building
Authors: Gaowa Wu Jin , Ming Wen Hui
Published: August 2013

Rural residential building design is an important part of residential construction, discover the problem in rural residential construction and find the way to solve the problem, it come forward is that the innovative design of rural residential building should take the road to green residential construction.
The Relationship of the Main Properties of Desulphurization Gypsum Based Inorganic Thermal Insulation Mortar
Authors: Lai Yong , Liu Yan , Luo Zhi Gang
Published: August 2013

This paper studies the relationship of the main properties of desulphurization gypsum based inorganic thermal insulation mortar. The results show that there are different linear correlations between fresh bulk density, hardened bulk density, compressive strength, volume water absorption, thermal conductivity and dry bulk density that is from 240 kg·m-3 to 500 kg·m-3. The linear correlations can provide some useful reference for the research and application of desulphurization gypsum based inorganic thermal insulation mortar.
Experimental Study on the Axial Compressive Strength and Elastic Modulus of GHPFRCC
Authors: Li Xiu Ling , Juan Wang
Published: August 2013

The sustainability of the construction material is increasingly coming to the forefront of the structure design and maintenance decisions. To address this, development of a new class of more sustainable construction material is needed, especially in China. This paper reports on the development of the green high-performance fiber-reinforced cementitious composites (GHPFRCC) with high volumes of fly ash and PVA fiber, and emphasizes the axial compressive strength and elastic modulus of GHPFRCC. Experimental results show that the prism axial compressive strength of GHPFRCC ranges from 15MPa to 40MPa. The elastic modulus of GHPFRCC is around 16-35GPa, typically lower than concrete.
Shrinkage and Cracking Behavior of Cement Based Materials Containing Undercalcined MgO-Based Expansive Agent
Authors: Zhang Shou Zhi , Tian Qian , Yao Ting , Guo Fei
Published: August 2013

This paper gives a comprehensive investigation on the effects of undercalcined MgO-based expansive agent (UMEA) on the shrinkage and associated cracking behavior of cement based materials, including length change under drying condition and restrained condition, and cracking under single-ring restraint. Experimental results showed that the UMEA could reduce the drying shrinkage as well as restrained shrinkage of cement based materials effectively. The measured shrinkage reduction was up to 55.3% at the age of 180d of drying. It was also found that the addition of shrinkage could effectively improve the shrinkage cracking resistance of cement based materials even under drying condition. The experimental results of autoclaving testing showed that the UMEA has a larger dosage of stability. If the dosage in cement is controlled according to the requirement of concrete construction, the UMEA can be used to compensate the shrinkage as designed.
The Research of the Effect of Fly Ash on the Shrinkage Property of Commercial Concrete
Authors: Liu Yan , Lai Yong , Luo Zhi Gang
Published: August 2013

In this paper, the effect of fly ash with different grades and dosage on early shrinkage and late shrinkage deformation of commercial concrete were studied. The effect of fly ash with different grades and dosage on volume stability of commercial concrete was assessed by using the test method of shrinkage cracking, and the causes and mechanism of the effect were analyzed.
Property of Water-Reducing and Crystallization on Superplasticize of the Concrete
Authors: Fu Zhong Jun , Song Feng , Yu Lu Shan , Wang Hong
Published: August 2013

In this paper, the effects of the water-reducing agent on the hydration property and the formation of the ettringite crystal of the concrete C3A were studied. Based on the thermometry analysis, the experiments of the effection of the hydration temperature on such concrete with both naphthalene- and polycarboxylate-type superplasticizers were conducted. The results could be drawn that the additives could prevent the slurry being hydrated in 1h, and decrease the hydration temperature. With the increasing of the additives, the hydration-inhibitory action of the additives was improved, too. The effect of the naphthalene- and polycarboxylate-type superplasticizers on the solubility property of C3A was also studied with EDTA titration, and the results showed that they can suppress the crystallization of the ettringite.
Techno-Economic Analysis of Fiber Reinforced Polymer Substation
Authors: Wang Yan , Li Liang , Zhang Yun Fei , Xu Mao Xing , Sun Qing
Published: August 2013

This paper studies on the technical and economic analysis of fiber reinforced polymer (FRP) substation framework. Firstly, based on the comparison of the material performance and price, we select the suitable fiber and resin as the main building material for substation framework. Then on the basis of numerical simulation, the bearing capacity of FRP substation truss-column under axial compression and bending is researched, and the initial geometric imperfection is considered in the models. Finally, the behavior of the typical two-span FRP gantry of substation is analyzed, and the economy of FRP substation framework is compared with the steel gantry which owns the same capability.
Experimental Study on Strength and other Performance of Solid Concrete Bricks Made from Recycled Coarse Aggregate
Authors: He Xi Xi , Zhang Tao
Published: August 2013

Recycled coarse aggregate solid concrete bricks were produced by QTY4-40 brick machine with strength grades of MU15-MU30. Compression and flexural strength of solid recycled coarse aggregate concrete brick were investigated. The impact of recycled aggregate on the solid concrete brick mechanical properties and physical properties was analyzed. The relationship between physical properties and strength, density was discussed.
Experimental Studies on the Impact of Waste Mineral Admixtures on Concrete Properties
Authors: Lin Cong , Liu Fu Sheng , Zhou Guang Fa , Zhang Yan Bin
Published: August 2013

As the common waste of the production in daily life,a large number of stone powder, fly ash, coal gangue was abandoned, and it causes large tracts of land was occupyed and the environment was polluted. Therefore it is great singnificance to saving resources and protecting environment by studing the impact of the three kinds of wastes as mineral admixtures on the properties of concretetTest shows that when the replacement rate of the three kinds of admixture is 20%, the replace quanity is considerable and the basic requirements on compressive strength, the anti-permeability performance, frost resistance of the concrete can be satified;when the replace content of the stone powder or fly ash is 30%, the performance of the concrete decreases, it only can be applied in the engineering whose quality requirement is relatively low; the properties of the concrete can't meet the requirement of the engineering application when the the replacement rate of the coal gangue is 30%.
Microstructure of Thin Wall Formed by Multi-Layer Laser Cladding
Authors: Huang Feng Xiao , Jiang Dong Mei , Zhang Wei Jun , Zhang Zhong Jun , Yang Zhao Hai
Published: August 2013

Thin wall was formed by multi-layer laser cladding. The results showed that the microstructure of the thin wall presented obviously and continuously grown dendrite and no white layer appeared between individual multi-layers. The orientated column dendrites were observed in the first layer, which was unhelpful to interfacial bonding. This is related to the effects of the substrate on the composition and cooling rate of the first layer. The interlayer bonding between other multi-layers was epitaxial growth with mutual occlusion and was helpful to the improvement of bonding intensity.
Effect of Different Curing Regimes on Shrinkage and Strength Properties of Self-Consolidating Mortars Containing Silica Fume in Different Contents
Authors: Esmaeili Jamshid , Kasaei Jamil
Published: August 2013

The aim of this research is to study the effect of different curing regimes on shrinkage and strength properties of self-consolidating mortars (SCM) containing silica fume in different contents. Self-consolidating mortars, as new technology products, are especially preferred for use in architectural elements and the rehabilitation and repair of reinforced concrete structures. SCM can be used in precast architectural elements or cast in place repair of reinforced concrete structures. Therefore, investigation on the effects of different curing methods on key properties of SCMs can be beneficial.
The shrinkage and strength properties of SCMs produced at different replacement ratios of silica fume (SF) with cement in different curing regimes were studied, at this paper. SCM mixes were prepared in constant water/powder ratio and cured in four different regimes including water curing (WC), accelerated water curing (AWC), air curing (AC) and aluminum tape sealing (AS). A polycarboxylate-based superplasticizer (SP) was added to the mixtures at different rates by mass of the cementitious materials to have appropriate flowability. Fresh mortars workability was determined using mini slump flow and mini V-funnel tests. All SCM specimens were tested and evaluated for compressive strength, flexural strength and shrinkage. It has been found that different curing regimes have considerable effects on both shrinkage and strength properties of SCM. It can be concluded that aluminum tape sealing and accelerated water curing can be used as effective and successful curing methods particularly where the SCM is used as a repair material or in architectural elements, respectively.
Creep Property of Magnetorheological Elastomers of Seism Isolator for Building
Authors: Yu Wei Xiong , Yang Shen Lin , Yang Xue
Published: August 2013

The performance of magnetorheological (MR) elastomers can be controlled by an applied field, so we can design intelligent isolators with adjustable and controllable parameters. All isolators more or less suffer from creep deformation, and the intensity will directly affect the service life of the equipment to be isolated. In this paper, NDI polyurethane-based MR elastomers were prepared and their creep properties were tested. The results show that as the filling mass fraction of carbonyl iron powder was increasing, the creep intensity in MR elastomers was first increased and then reduced; when the mass fraction was 70%, the creep intensity was less than that of the base material. Therefore, the creep property of MR elastomers can be improved by designing an appropriate content of carbonyl iron powder according to use requirement.
Influences of Limestone Powder on the Performance of Self-Compacting Concrete
Authors: Gu Hai Peng , Li Gu Hua , Gao Jin Liang , Zeng Xiao Hui
Published: August 2013

This paper primary researched the influence of limestone powder on the workability, the strength performance and the volume stability of self-compacting concrete (SCC). Results showed that the workability of self-compacting concrete was improved greatly by mixing proper limestone powder; besides, limestone powder could improve early age strength of concrete obviously, but had little influence on long age strength; the self-shrinkage of concrete increased as the admixture of limestone powder increased. The content of limestone should be capped at 10% and the optimum mix amount is about 7%.
Effects of Two Polypropylene Fibers on the Properties of High Strength Concrete
Authors: Zhou Bai Rui , Han Dong Dong , Yang Jian Hua , Peng Yi Liang , Li Guo Xin
Published: August 2013

Portland cement, crushed stone, sand and superplasticizer were used to obtain a high strength concrete with a low water to binder ratio. A reticular polypropylene fiber and a single polypropylene fiber were used to improve the strength of the high strength concrete, but the effects of the two fibers on the slump and strengths were quite different. The reasons of the differences were the surface area and the modulus of elasticity of the fibers. The results show the reticular fiber was better to used in high strength concretes.
Experimental Study on High Strength Composite Ceramsite Using Fly Ash and Waste Glass
Authors: Hong Lei , Cheng Wei
Published: August 2013

The high strength composite ceramsite was prepared by using fly ash and waste glass as main raw materials and some admixtures such as binder and bubble-forming agent. The suitable technological condition of preparing high strength composite ceramsite was given by studying the influence of the different mix proportions and different sintering systems on the properties of ceramsite. The test results indicate that the compressive strength in cylinder of high strength composite ceramsite which was prepared under certain technological condition can reach 9.9MPa and its bulk density is 974Kg/m3 and the water absorption in one hour is 3.6%. The XRD(X Ray Diffraction) and SEM (Scanning Electron Microscope) analyses show that a large number of amorphous gel phases which affect the strength of ceramsite were produced in the process of sintering fly ash and waste glass and abundant even bubbles were formed inside of the ceramsite.
Preparation and Characterization of Polycarboxylate Superplasticizer Synthesized at Non-Aqueous Condition
Authors: Liu Xiao , Wang Zi Ming , Liang Xu , Zhu Jie , Zhang Yang
Published: August 2013

Polycarboxylate superplasticizer (PCE) was synthesized in non-aqueous system to achieve the rapid transportation and convenient preparation. The results showed that, PCE using isopentenyl polyethylene glycol (TPEG) or isobutenyl polyethylene glycol (IPEG) as macromonomer exhibited excellent paste fluidities and retaining properties at 80°C and 75°C, respectively. Fourier Transform infrared spectroscopy (FTIR) measurement confirmed the polymerization between monomers. The synthesized PCE as solid state was dissolved into water to prepare the PCE solution, and its cement application performances were studied systematically. The results showed that PCEs with good paste fluidity retentions exhibited the longest final setting time and the shortest setting time interval. The hydration heat results showed that PCEs with good fluidity properties can significantly delay the hydration process and lower the hydration heat.
Effect of Bentonite on the Performance of the Limestone Manufactured-Sand Mortar
Authors: Yu Chun Hui , Li Gu Hua , Gao Jin Liang , Lan Bo , Wei Qun , Xu Da Zhen
Published: August 2013

In order to improve workability of manufactured-sand mortar, limestone manufactured-sand mortar mixed with bentonite, and discussed the role of different dosage of bentonite that had played on mortar fluidity, consistency, layered degree ,mortar compressive and flexural strength. The results show that, mortar water demand increases, fluidity, consistency, stratification decreases with increasing bentonite dosage. Bentonite can be good to improve the water retention properties of the mortar. Doped bentonite mortar strength improved, when doped with 0.9%, mortar has best water retention, flexural, compressive strength also reached maximum.
Dynamic Compressive Performance of Concrete Exposed to High Temperature Based on Microstructure Analysis
Authors: Yang Shao Wei , Liu Zhi Guo , Wang Yong Wei , Liu Zi Rui , Ba Heng Jing
Published: August 2013

Combined with strain gauge measurement method, the modified split Hopkinson pressure bar was adopted to investigate the behavior of normal concrete and steel fiber reinforcement concrete exposed to 400°C and 800°C under axial impact compressive loading. The experimental results show that compared with normal temperature, the compressive strength and elasticity modulus of normal concrete exposed to 400°C and 800°C decrease obviously. The transformation of concrete exposed to high temperature in microstructure is analyzed by SEM. The influence of high temperature on macro mechanics performance is discussed.
Study on the Composition of Inner Mongolia Wudangzhao Monastery Building Complex
Authors: Zuo Yun
Published: August 2013

Tibetan Buddhist monasteries embody almost all achievements of the Tibetan community in religious, scientific, cultural and artistic. The erection of Tibetan Buddhist monasteries are closely related to the history of Tibetan Buddhism in Inner Mongolia. As the Tibetan Buddhism had been spread to Inner Mongolia in different periods, Tibetan Buddhist monasteries presented different features in its architectural style. Wudangzhao Lamasery is the grandest integral monastery complex still remaining in Inner Mongolia.Its buildings have high value of art and characteristically Tibetan Buddhist Architectural style on monasterys arrangement and style. Different types of the building gathered together form a Tibetan monastery, buildings complex reflected the intact standard of Tibetan Architecture. They express the Tibetan traditional mountain worship idea, and Buddhist the Mandala Cosmology and Three Realms idea.
Experimental Study on the Shearing Property of Equal Strength Recycled Coarse Aggregate Concrete
Authors: Deng Zhi Heng , Liao Yi , Meng Chao Lou , Yang Hai Feng
Published: August 2013

For the purpose of studying the difference between recycled concrete and ordinary concrete on shearing property under the circumstance of equal strength, nine recycled concrete beams, which have equal altitude and varying width, have been produced by using different replacement rates of 0%, 50% and 100% respectively to test their shear performance. The differences between recycled concrete and ordinary concrete on shearing strength, shearing strain and constitutive relation were analyzed in this paper. The study indicates that with the same compressive strength, there is only a slight difference between recycled concrete and ordinary concrete on shearing strength. The shearing strength of the recycled concrete is similar to the tensile strength of the ordinary concrete. Recycled concretes peak value increases as shearing strength increases. The stress-strain curve of recycled concrete is similar to that of the ordinary concrete. Its shear modulus increases when shearing strength increases.
Experimental Study on the Impact of Workability of Low Strength Manufactured Sand Concrete
Authors: Xu Da Zhen , Li Gu Hua , Liao Zhuang Zhi , Yan Hai Wei , Yu Chun Hui
Published: August 2013

The concept of powder volume equivalent coefficient is presented to study the reasonable powder volume and solve the problem that the cohesiveness and bleeding of low strength manufactured sand concrete is poor. With the way of laboratory experiment, water requirement of normal consistency of different powder is tested to determine the powder volume. The impact of powder volume on the low strength manufactured sand concrete workability under same sand ratio is analyzed with improved Mehta method. The experimental result shows that freshly mixed low strength manufactured sand concrete workability can be evaluated with powder volume equivalent coefficient and the reasonable powder equivalent volume is 156~160L/m3.
The Synthesis and Application of a Novel Class of Polyols for Preparation of Polyurethane
Authors: Li Xiao Lin , Fang Zheng , Ji Dong , Wan Zhi Dong , Guo Kai
Published: August 2013

The synthesis of a novel class of diamine-based polyols derivatives and the potentials and the limitations of these polyols were reported. This class of diamine-based polyols with high hydroxyl values and no acid values can be used in rigid polyurethane foams. The prepared rigid foams show the properties of low density, high closed cell content, low thermal conductivity, and high compressive strength.
The Effect of Slate Powder on Fly Ash in Suppressing Alkali Activity of Slate Aggregate
Authors: Zhang Long Sheng , Li Gu Hua , Huang Wu , He Xiao Chun , Jiang Fang , Liu Tong Chao
Published: August 2013

Slate has high alkali activity.When broken as aggregate, it produce high content of slate powder.In order to study the effect of slate powder on fly ash in suppressing alkali activity of slate aggregate and the possibility of making full use of the powder,we carried the experiment on rapid mortar bar method.The experimental results show that:1. When the content of slate powder is less than 15% , it has no adverse effect on fly ash in suppressing alkali activity of slate aggregate. When the content of slate powder is greater than 15%,it can increase the effect of suppression.2. For alkali-silica reaction,what really suppress it is the active SiO2 that comes from slate powder or fly ash.As long as the mineral admixture containing active SiO2 grinds fine to the fineness of cement particle, it can increase the effect of suppression on fly ash in suppressing alkali activity of slate aggregate, rather than reduces the suppressive effect.
Research on Enterprises Resettlement in the Second Urban Land Resource Development - Taking High-Tech Zone in Suzhou for Example
Authors: Du Yong , Yu Wen Xue
Published: August 2013

As cities are expanding of China, many industrial enterprises have been surrounded in the center of the, which have a big effect on the environment of the city. As a result, its necessary to remove these enterprises. The second urban land resource development is an efficient solution to the problem. This article takes the secondary development of land in High-tech Zone of SuZhou for example and defines second development of land. In addition, puts forward suitable type of settling down the moving enterprises because of urban land second development. The study aims at promoting the rational use of land, adjusting space distribution of construction land, disposing land resource reasonably, increasing using rate of the construction land and makeing ecological environment of the city be better.
Research on Strain Transfer of Embedded BOTDA Sensors Analyzed by FEM
Authors: Qiao Yan , Sun Chuan Zhi , Zhang Biao
Published: August 2013

in this paper, the theory of strain transfer of embedded BOTDA sensors was introduced. For the sensing fiber with coating and jacket used in project, its finite element model was built by ANSYS infinite element analysis software. And for the embedded fiber, the influences affected by elastic modulus and thickness of the fiber coating and jacket and elastic modulus of matrix material were analyzed. For the surface bonded fiber, the influences affected by elastic modulus, width and thickness of the bonding material were analyzed, and the results were compared with the results of theory.
Fire Prevention and Controlling Measures for Building External Thermal Insulation System
Authors: Zhang Fu Dong , Chen Ai Peng , Zhai Ying Xin
Published: August 2013

This text induces the common kind of thermal insulation materials first, then analyzes the fire characteristics of building external thermal insulating system, and puts forward some fire prevention and control measures for it.
Conceive on Construction of Government Supervision in Construction Quality Standard System
Authors: Guo Han Ding , Shang Ling , Lei Li Zheng , Zhang Yin Xian
Published: August 2013

Government Supervision in Construction Quality Standardization is the intrinsic requirement of implement scientific supervision, which essential ends to standard surveillance behavior, improve efficiency and level of supervision and promote continuous improvement in construction engineering quality. Government supervision in construction quality standardization consists of three systems, including supervision process, decision and implement standardization. Construction of supervision process standardization and supervision decision standardization is theoretical connotation requirements of government supervision in construction quality standardization; Construction of supervision implement standardization is the inner rules of government supervision practice. supervision process standardization mainly involves three aspects: the chief of supervision, the content of supervision, the operation of supervision; supervision decision-making consists of expression standardization of supervision results, standardization of supervision decision-making and assessment standardization of performance evaluation. Supervision implement standardization consists of supervision program, supervision project, supervision mode and supervision achievements standardization.
Study on the Quality Control of the Concealed Works of Construction Project
Authors: Qian Zheng , Wu Xiao Gang
Published: August 2013

This thesis analyses on current situation of the concealed work on the basis of the practical research, concludes the mainly attention aspects and more practical solving methods of Chinese concealed works in the three stages. Finally the development directions of the concealed work are proposed.
Research on Construction Quality Control Measures of Key Construction Works
Authors: Bo Peng , Li Jun Jun , Liu Cheng Qing , Cai Hong Ru
Published: August 2013

With the development of the construction work, the quality of construction works is concerned by more and more people. People are increasingly aware of the quality of the project, which is the core of the building works, related to the safety of life and property related to the construction business survival and development. This requires strict control of the quality of building construction, especially for the quality control of key parts of the construction work even more critical. To do this, select the control point of the key parts of the construction works, construction quality control methods and measures for key positions, from the quality control point in addition to meet the quality control requirements in accordance with the general site construction when elaborated higher requirements need its special control measures.
The Research on Testing Processing Effect of Dynamic Compaction Subgrade Based on Transient Rayleigh Wave Method
Authors: Wu Yan Kai , Wang Hui Yu , Sang Xian Song
Published: August 2013

As a convenient and rapid nondestructive testing method, transient Rayleigh wave has an increasingly wide range of applications in engineering, and the testing result is increasingly accepted in the engineering domain. With engineering examples, this article mainly analyzed the nondestructive testing principle and detected the data processing method. By analyzing the engineering example that using transient Rayleigh wave method to detect the effect of dynamic compaction about foundation, the conclusion that transient Rayleigh wave could conveniently and rapidly detect the effect of dynamic compaction about roadbed of the expressway was farther proved, which has certain provide engineering significance for the future engineering detection.