bluuebunny/crossref_metadata_2025 huggingface dataset:
Growth and Mechanics of Brittle Fault Systems in Rock Mass: An Example of Baihetan Hydropower Dam Area
Authors: Cheng Wan Qiang , Di Sheng Jie , Xu Xue Yong , Song Gang
Published: July 2014

Architectures of fault systems play important role in stability and mechanics of rock mass. While growth mechanism of faults is intrinsic controler for architectures of fault systems. This paper presents a case on faulting in the dam area of an oversized hydropower in Southwestern China. The faults in this area are mostly strike-slip faults with shallow brittle deformation characters, extending tens to hundreds of meters. These faults can be divided into four groups which are formed during two generations corresponds to two periods of tectonic events. Growth model of these faults have been built based on geologic and mechanic data. The first generation of faults was formed based on preexisting joints. While the secondary generation emerge only if the existing faults become critically misaligned during rotation of the primary stresses. The criterion laws for formation of secondary faults are suggested. According to the growth model, we can predict placement of secondary faults in space. Conversely, when geometry and space characters of the fault systems are known, we can estimate mechanic parameters and tectonic environments of the rock mass.
A Modified Method to Fit Probability Distributions of Geotechnical Parameters Using Stochastic Weighted Entropy Principle
Authors: Zhang Shu Jun , Xu Zhi Jun , Zhong Luo , Xiao Zhao Ran
Published: July 2014

Due to various uncertainties, most of geotechnical parameters are small samples, which causes much trouble when the probability distribution of geotechnical parameter is fitted using traditional distributions. This paper uses stochastic weighted method to improve the small samples of Geotechnical parameters into big samples, thus solving the problems caused by the small samples. Meanwhile, the probability density function of geotechnical parameter is derived based on maximum entropy principle, the advantage of presented method is verified through Kolmogorov-Smirnov Test. Case study shows that the proposed method not only overcomes the dependence of conventional fitting methods on classical probability distributions, but also the fitting more close to the fact because the data come from the big sample improved by geotechnical parameters, which has important engineering significance.
Research about Control Factors and Early Warning System of Early Warning System in Song Fangtun Oilfield
Authors: Lv Nan , Wang Yue Ming , Liu Hong Yu
Published: July 2014

The development effect of Song Fangtun Oilfield is mainly restricted by two factors which are geology and exploitation. In view of the main control factors in oilfield development, we selected two indexes,monthly average decline range and water content escalating rate to establish early warning system of blocks development effect. The system which has great practical application value, is sensitive to reflecting the monthly variation process of block development effect, and plays a certain guiding role in the development effect during the whole year.
Application of Self-Drilling Anchor on Coal Gangue Slope Treatment
Authors: Chen Tai Li , Zhou Jin , Wang An Ming , Li Huan
Published: July 2014

In the reinforcement of coal gangue slope treatment, it is difficult for hole and construction with traditional method, self-drilling anchor method was adopted, Slope stability safety factor was calculated with slope stability analysis software under coal gangue slope and self-drilled anchor reinforcement coal gangue slope, and finally the anchor pipe processing technology, construction methods and the production of grouting process and framework were introduced, which provided the practice for similar engineering.
Uncertainty Analysis and Monitoring of Earth Dam
Authors: Yang Ling Qiang , Gao Rui , Wang Yan
Published: July 2014

Monte Carlo simulation provides a probabilistic method to evaluate the physical behavior of earth dam. Therefore, the behavior could be got in a more realistic manner. Based on the theory, an innovative software program code is developed by combining the Monte Carlo and finite difference methods to predict the performance of earth dams after impounding. In order to assess the efficiency of the method, the case study of earth dam, located at Southeast of China, has been studied in detail. The performance of this dam is predicted and compared with the field monitoring by using the monitoring data. The results shows the robustness of the proposed method.
Justification for Determination of the Depth of an Active Zone Based on the II Group of Limiting States
Authors: Nurumbayeva Lunara Maksotovna , Badanin Andrey Nikolaevich
Published: July 2014

The problems of the amendments in the updated edition of SNIP 2.02.01-83 * “Foundations of buildings and structures" SP 22.13330.2011 “Foundations of buildings and structures” are discussed in the article". Theoretically, the depth of the core is not justified anywhere and the restrictions are made only on the basis of experimental data. The importance of the amendments should be displayed theoretically. In according to the newly adopted regulatory framework the results of the foundation settlement calculations for the limited states of the second (II) group by the layer-stack summation method with the justification of the amendments in the updated edition of SNIP 2.02.01-83 * "Foundations of buildings and structures" SP 22.13330.2011 "Foundations of buildings and structures” are shown in this article. In the second part of the article the optimum width selection calculation results of projected foundation and identification of the economic benefits of decisions made are shown.
Construction Methods for Long-Span and Bifurcation Tunnel Structure
Authors: Xin Chun Lei , Gao Bo
Published: July 2014

Long-span and bifurcation tunnel engineering is not very common in underground engineering field. It is difficult to construct this complicated structure because of the numerous influencing factors. In order to find out the optimum construction method for long-span and bifurcation tunnel to guarantee construction security and stabilization of this project, six construction methods were compared and analyzed by using numerical simulation. The results show that: (1) The excavation of confluence segment and small interval tunnel can affect each other but the confluence segment is the crucial part of the whole project. (2) The vertical brace determines surrounding rock and preliminary support stabilization in confluence segment. (3) The central concrete between main tunnel and ramp tunnel is the key point to guarantee the construction security and stabilization of small interval tunnel. The above results certainly contribute to research and develop new types of construction methods for long-span and bifurcation tunnel engineering.
Analytical Hierarchy Process Based Post-Earthquake Health Diagnosis Method for Tunnel in South of China
Authors: Huang Hao , Zhang Wei , Yang Lu Feng , Chen Zhen
Published: July 2014

In order to evaluate the health condition of the tunnel in South China and give advices on reinforcement and maintenance scheme, a post-earthquake health diagnosis method is presented. After a comprehensive investigation on failure modes of tunnel, a four-level ranking method and a index system for post-earthquake health diagnosis of highway tunnel are proposed. Besides, analytical hierarchy process (AHP) is introduced into for determining the post-earthquake health diagnosis mode. Case study manifests the validity of the proposed method, which can provide valuable guide to the post-earthquake health diagnosis and relief work.
Impact on the Cement Mortar’s Uniaxial Compressive Strength under Erosion of SO42-
Authors: Zheng Nan , Wang Yue
Published: July 2014

Cement mortar is one of the commonly used building material . The effect of erosion is widely seen after a certain time. Based on the method of simulated experiment, Erosive ions at different concentrations, different age under uniaxial compressive strength of cement mortar and the influence of stress strain relationship are discussed. The results show that ion erosion was evident on cement mortar. Especially, certain solution concentration of SO42- can enhance the strength of cement mortar. This research has important reference value for the application of cement mortar in complex environment.
Dynamic Recrystallization Behavior of High Carbon Chromium Bearing Steel
Authors: Zhang Xiao Lei , Li Hui , Xu Shi Xin , Li Zhi Chao , Mi Zhen Li
Published: July 2014

The effect of process parameters on dynamic recrystallization of GCr15 bearing steel was investigated by a single-pass compression tests using Gleeble-3500 thermal simulator. The results indicate that the flow stress decreases with the increasing of temperature and the decreasing of strain rate. The dynamic recrystallization rate increases with the increasing of deformation temperature. By regression analysis, the mean activation energy and the stress exponent are determined to be 435.1KJ/mol-1and 5.0505 respectively. Meanwhile, the kinetic mathematical model of dynamic recrystallization and constitutive equation are established.The relationship of peak stress, peak strain and Z parameters is founded by using the data of flow stress curves.
The High Performance Concrete Curing Agent Based on Polyacrylic Emulsion with Hydroxyl Monomer HPMA
Authors: Wang Rui , Li Lei , Wang Hong Song , Wang Wen Bin , Wang Wei , Tian Qian
Published: July 2014

The influence of the chemical structures of styrene/butyl acrylate/hydroxyl propyl methacrylate emulsion on some properties of ordinary Portland cement concretes has been investigated as concrete curing agent. The structural parameters that are varied included the fractions of HPMA and the polymer structure of the shell-core. The result of the study showed that the hydroxyl monomer HPMA played an important role on the improvement of water retention and the optimal proportion is about 5 wt% of the polymer. In addition, the shell-core structure of the emulsion with HPMA located in shell polymer can further enhance the water-retention rate. Besides, the emulsion with hydroxyl groups could smooth the surface of the concrete, inhibit the carbonation and had positive influence on the compressive strength.
A Multidimensional Constitutive Model for Shape Memory Alloys
Authors: Wang Wei , Liu Ji Yuan
Published: July 2014

A multidimensional constitutive model for shape memory alloys (SMA) is developed in the paper, which is based on the thermodynamics theories of free energy and dissipation energy. This model can well describe both the shape memory effect (SME) and super elasticity effect (SE) of the thin-walled SMA cylinder under an axial tensional force and torsion.
Effects of Temperature on Drying Shrinkage of Concrete
Authors: Yang Ying Zi , Li Mao Guang , Deng Hong Wei , Liu Qi
Published: July 2014

The present study investigated experimentally effects of temperature on drying shrinkage of concrete in different water cement ratio and containing mineral admixture. Concrete was exposed to a controlled environment of 20±1oC, 35±1oC, 50±1oC, and 60% ± 5 RH, respectively. The drying shrinkage of concretes with water cement ratio of 0.3, 0.4 and 0.5 were evaluated. The resuluts showed that with the increase of temperature from 20 oC to 50 oC, the influence of water cement ratio on drying shrinkage of concrete was gradually weakened. The shrinkage strain of concretes with replacement of cement by 20% of ground granulated blast-furnace slag (GGBS), 10% of silica fume (SF), and 20% of fly ash (FA) were measured, respectively. Test results showed that GGBS had a little impact on drying shrinkage of concrete; Silica fume could increase the drying shrinkage of concrete significantly in the early and later ages, especially when concrete was subjected to high temperature; Fly ash reduced drying shrinkage in early ages and increased drying shrinkage of concrete in the later ages.
Comparative Study on Traditional Commercial Block Transformation Method
Authors: Zheng Chen , Gao Yu Bo
Published: July 2014

With the development of economy, people are no longer satisfied with consumption patterns of simple items, but rather towards experiential consumption. French philosopher Jean Baudrillard said: "consumption is not only the consumption or use of goods, but also the consumption of experience self-worth." How to better and more effectively to modify traditional commercial blocks, making it the place of both inheritance of historical culture and can adapt to the contemporary experiential consumer psychology is a problem worth thinking deeply. This paper aims to make an integrated comparison in transformation principles and practices between developed countries traditional commercial blocks and successful cases in our country, summarizes the mutual relations and rules.
Investigation of the Sintering Mechanism of Steel Slag-Based Ceramics
Authors: Zhou Yuan Yuan , Li Yu , Cang Da Qiang , Li Hong
Published: July 2014

In order to manufacture high-value added materials from steel slag, a steel slag-based ceramic was prepared in the paper. X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques were carried out to characterize the phase formation and the microstructure of the steel slag-based ceramics. Besides, the line shrinkage, flexural strength and water absorption were also determined.Results show that the variation of the line shrinkage and the flexural strength had a positive correlation with the increase of the temperature at the interval 1160°C~1210°C, which was opposite to the change of the water absorption. 1210°C was proved to be the optimum sintering temperature in this work, at which the maximum flexural strength was obtained with a value of 99.39MPa. With the temperature increasing, the quartz phase gradually decreased, participating in the sintering reaction, and the diopside become dominant phase with columnar crystals in 2-5μm at length, which would contribute to the fine performance of the ceramics.
Application of Information Entropy in the Cement Grouting Test Using Impact Acoustics
Authors: Cheng Jin , Han Qing Bang , Fan Hong Hui
Published: July 2014

The unqualified corrugated pipe grouting quality in bridges will lead to serious safety accidents. The sound field propagation in corrugated pipe structure was simulated and analyzed using finite element method, a much complex wave propagation characteristic is demonstrated, and the scattering signals caused by grouting defect are hardly distinguished. The collected impact-echo signals were processed by signal processing of information entropy technology. It is found the defect size is directly related to the information entropy. Several simulated models are constructed and measured, and the bigger size defect is, the lower entropy value is.
Effects of Structure Characteristics of Fly Ash on Performance of Ready-Mixed Concrete
Authors: Guo Xiao Yan , Hao Run Xia
Published: July 2014

Effects of structural characteristics of two different types of fly ash on performance of ready-mixed concrete were studied.Results indicated that, comparing with fly ash containing round spherical micro-Pearl 80% around , fly ash containing round spherical micro-Pearl below 20% will reduced work performance of pre-mix concrete clearly, water requirement increases 16% around, slump loss 0.5h for 100mm around, 1h for 140mm around, and because needed using excessive of pumping agent and makes setting time of concrete extended. Major accident hazards exist in actual pumping concrete. Respectively 40% two types of fly ash cement hydration morphology comparative studies showed that, mixed with fly ash containing round spherical micro-Pearl below 20% ,hardened cement paste with high porosity, density is low, such ash failed to improve performance of cement matrix.
Numerical Analysis of Combined Aggregate Concrete from the Meso-Scale Level
Authors: Zhang Yan Kun , Zhao Shu Shan , Qu Tie Jun , Wu Hai Ying
Published: July 2014

In the paper , the combined aggregate concrete is regarded as a three-phase composite material based on the meso-scale level, it consists of lightweight aggregate, ordinary aggregate and mortar. According to Fuller’s grading curve, the number of aggregate with different size could be obtained. And the randomly aggregates model is generated base on the Monte Carlo method. APDL program is developed to generate finite element model of combined aggregate concrete, On the basis, the stress characteristics of combined aggregate concrete is studied.
Production of Bio-Resistant Wood Materials through the Modification of Wood by Boron-Nitrogen Compounds
Authors: Stepina Irina Vasil'evna , Sidorov Vyacheslav Ivanovich , Klyachenkova Ol’ga Aleksandrovna
Published: July 2014

Modifying of the surface of pine wood with aqueous solutions boron-nitrogen compounds was empirically found to provide a 100% biological stability of wood for at least 20 years. Durability of the protective effect of the modifiers developed is due to the formation of hydrolytically stable compounds on the surface of the wood.
Research on POE Index System Establishment of Winter City Commercial Building
Authors: Liu Jia Sheng
Published: July 2014

Base on the basic principles of Environment - behavior Study, Architectural Anthropology and Maslow's Hierarchy of Needs, the writer combined the characteristics of winter city buildings and made a tentative research to set up an index system suitable for the Post Occupancy Evaluation (POE) of winter city commercial building.
Research on the Restraint Expansive Stress of MgO Reinforced Concrete at the Early Age
Authors: Cheng Jun , Li Hua , Wang Yu Jiang , Yao Ting , Li Si Chen , Li Lei , Tian Qian
Published: July 2014

To solve the problem of early-age concrete shrinkage under constraint, 0%, 2%, 3%MgO expansion agent are mixed in the concrete. Results indicate that MgO expansion agent can ensure the expansion strain of the concrete and produce the self-stress under constraint which is up to 1.8Mpa~2.2Mpa.
Study of the Mechanical and Thermodynamic Properties on NiAl and Ni3Al
Authors: Deng Yong He
Published: July 2014

The stuctural, elastic and thermodynamic properties of B2-NiAl and L12-Ni3Al intermetallic compounds are systemically investigated. Using a first principle pseudopotential plane-wave method, several basic mechanical parameters of B2-NiAl and L12-Ni3Al crystals, such as the equilibrium volume, the bulk modulus, the elastic constants, the Zener anisotropy factor, the Poisson’s ratio, the Young’s modulus and isotropic shear modulus are firstly calculated. And then the temperature dependence of the equilibrium volume, the bulk modulus, the thermal expansion coefficient, the heat capacity, the Debye temperature and the Grüneisen parameter are further evaluated in the framework of a quasi-harmonic Debye model. Finally, a special attention is paied on the mutual influence of pressure and temperature on mechenical and thermodynanic properties of B2-NiAl and L12-Ni3Al intermetallic compounds in the range of 0-20 GPa and 0-1000 K.
Research on the Modern Architecture Design Using Aesthetic Culture
Authors: Yu Qing , Li Xiang Hui , Du Jing Ming
Published: July 2014

This paper introduces the dynamic and space-time of architecture aesthetics, and gives the application of aesthetics in the modern architectural design, puts forward the design the building belongs to the times and nation, with the national culture and the whole human emotions. The concept of modern architectural design is to do the whole processing in the building color, proportion, texture. The building is through the transformation and the shape of the environment, the stunning beauty and education presented in front of us, embodies the unification of utility function and mental function of architectural beauty, this is also the significance of existence of architectural design.
Experimental Study on the Performance of the Basalt Fiber Concrete Resistance to Freezing and Thawing
Authors: Jin Sheng Ji , Li Zhong Liang , Zhang Jian , Wang Yan Ling
Published: July 2014

The concrete composite material with basalt fiber as enhancing system in it has a lot of advantages ,including excellent mechanical properties , high temperature resistant, resistant to acid and alkali, low cost, environmental protection materials and resistance production process. It has been applied to the field of construction project. Damage of northern environment of freezing and thawing on the properties of the composite material has become a new hot issue. In order to study the characteristics of basalt fiber reinforced concrete as building composite materials in the process of freezing and thawing, this research uses the freeze-thaw cycle test to carry out the performance study on change of dynamic modulus of elasticity and quality loss of basalt fiber concrete. We use basalt fiber volume content of 0, 0.1%, 0.2% and 0.3% respectively of four groups of concrete specimens as the research object, to carry them on the freezing-thawing resisting performance test research. Research results show that the performance of dynamic modulus of elasticity and quality loss of basalt fiber concrete in freezing and thawing process is obviously better than the plain concrete. The dosage of 0.3% basalt fiber concrete freezing-thawing resisting performance is the best in the four groups of concrete samples.
Finite Element Analysis of Shearing Bond Behavior of CFRP-Concrete Interface
Authors: Hai Hong , Wang Wei
Published: July 2014

The debonding behavior at the interface between carbon fiber-reinforced plastic (CFRP) sheet and concrete is a key problem for the application of FRP plate, which has been widely applied in the civil engineering for rehabilitation and retrofitting of conventional structures. This paper presents the nonlinear finite element analysis results of the CFRP-strengthened high-strength concrete member. On the basis of the test, considering of the bond-slip relationship, explicit finite element is used for simulating the shear failure of CFRP-strengthened concrete, obtain three-dimensional deformation development diagram, describe the failure mode and the relationship between the shearing bond behavior and concrete strength. The FE results coincide with the experimental results.
Study on Community Empowerment by Conversation Art and Design
Authors: Lin Wen Chia
Published: July 2014

Community is a basic element of living field. However, due to the influence and intervention of modernization, the original life styles and traditional cultures of Taiwan’s rural areas have vanished gradually. Since the Council for Cultural Affairs (CCA), Executive Yuan promoted the policy of Community Empowerment in 1994, there have been plenty of discussions related to the topic.Aiming at the operation and combination of Local Aesthetics and Art Community, the cultural policies such as Cultural Citizenship and Civil Aesthetic Movement have made Art into the Community a famous topic in the artistic fields and community construction.Through long-term participation in the construction of Tugou Community , the study reviews the modes, implementations, positions and values of art issues during the integration of Community Empowerment and Art over the years, and analyzes the spirits and meanings behind the issues. The progress of community aesthetics is mentioned in the study, which not only emphasizes on the Publicity and Participation of art empowerment, but also observes the influence of artworks on aesthetic experience of residents and become the technique applied in the space planning and building. It expects to propose a methodology or epistemology on seeking for local aesthetics and practices on life and art for Taiwan’s community empowerment in the future.
The Effect of Steel Fiber on the Road Performence of Asphalt Concrete
Authors: Guo Jie Fei
Published: July 2014

In order to solve the problems relevant to asphalt concrete,such as cracking in low temperature, bleeding in high temperature and water damage,this paper put forward the ideal incorporation of steel fiber with asphalt concrete to reinforce the pavement performance and service life.By analyzing the test results such as rutting test, low temperature bending test,freeze-thaw splitting test and comparing with the stability in high temperature, anti-cracking performance in low temperature and the water stability between steel fiber asphalt concrete and the ordinary asphalt concrete,we can conclude that adding steel fiber with asphalt concrete can significantly improve the performance of road.This paper has reference value for choosing asphalt pavement in areas of low temperature and heavy traffic.
Impact of Slag Powder Concent on Splitting Tensile Properties of Concrete
Authors: Zhang Xiao Na , Liu Qin
Published: July 2014

Through the ordinary Portland concrete mixed with slag powder and its experimental research, studies and analyzes the impact on the concrete splitting tensile strength of different age, slag powder content and the water-cement ratio. The test results show that the increase of slag powder content makes splitting tensile strength of concrete reduce after the first increase; growth age makes splitting tensile strength of concrete increases; increasing water-cement ratio makes the splitting tensile strength of concrete intensity decreases.
Test Study on the Bonding Properties between Deformed Steel Fibers and Cement
Authors: Lv Jin , Liu Jian Zhong
Published: July 2014

In order to investigate the bond strength between deformed steel fiber and concrete, various deformed steel fibers, like arch type fiber, spiral type fiber, bundle fiber, end-hooked fiber and so on, are produced. Straight type fiber and deformed fiber were embedded in mortar to do the bond strength experiment. A comparison with each other was carried out. It has been found that the change of the fiber cross section increases the bond strength between steel fiber and concrete matrix, growth range outweighs 100%. When modified both ends of anchorages, the bond strength raises 400% in contrast with straight type steel fiber. Besides, the deformed fiber, which went through two modified methods, enhances the bond strength over 700% in comparison with straight type fiber.
Dynamic Characteristics of Carbon Nanotube Reinforced Epoxy Resin Composite Materials
Authors: Yao Yun Xiu , Sun Yan Ting , Chen En Li , Chu Bo Gang
Published: July 2014

Carbon nanotubes (CNTs) were modified by alkali, and carbon nanotubes epoxy composites samples were prepared by the hot pressing method. Dynamic characteristics of the composites were studied by experiments. The results suggest that carbon nanotubes can hardly enhance the first natural frequency of epoxy composite, but the change of second and third order natural frequencies are obvious compared with the first one. Damping properties of the composites are improved, and with the mass ratio of CNTs increasing, the first three order damping properties of composites are all increased initially followed by the decrease. The results also indicate that flexural elastic modulus of the composites is enhanced, the first and the second order dynamic elastic modulus is greater than it but the third order is opposite. The first three order dynamic modulus of elasticity moments of CNTs composites whose mass fraction is two percent are all high.
Prospects of Use and Impact of Nanoparticles on the Properties of High-Strength Concrete
Authors: Frolov Artem , Chumadova Ludmila , Cherkashin Artemiy , Akimov Luka
Published: July 2014

The basic properties of concrete can dramatically improve due to the unique structure of the nanosized particles. Namely, strength, frost resistance, fire resistance, corrosion resistance are increased, density and permeability are reduced; plasticity and water absorption are regulated. Despite of the huge number of advantages of nanomodified concrete, analysis of the use of nanoparticles shows that they are used quite seldom, as it requires a large cash outlay. It is not always profitable to use such additives. This article discusses some additives: magnesium nanoshpinel, microspheres, rice hull ash and metakaolin, astralenes, ferric hydroxide sol, carbon nanotubes, silica fume, nanosilica, MB-01, combined modifiers, based on iron hydroxide sol and silica sol. As well in this article sol-gel method as an additive in concrete is considered. The analysis shows that the use of nanosized particles can reduce a large amount of cement. As an addition, savings of the use are seen in reducing the cost of construction due to the low density with high strength. Accurate material consumption and maximum use of advantages of nanomodified concrete provide great prospects of implementation of this material in construction.
Experimental Study on Mechanical Properties of Ultrafine Copper-Plated Steel Fiber Reinforced Cementitious Composite
Authors: Sun Wen , Wan Yuan Lin
Published: July 2014

With ordinary Portland cement, fly ash, silicon powder, admixture and ultrafine copper-plated steel fibers with a diameter of 0.12 mm as raw materials, this paper studies the mechanical properties of ultrafine copper-plated steel fiber reinforced cementitious composite as well as their relationships. 14 groups of cube specimens, prism specimens and tensile test specimens were designed, fabricated and tested to obtain the mechanical properties of ultrafine copper-plated steel fiber reinforced cementitious composite; test specimens’ failure characteristics, contour plots of strains, increasing rules of cube compressive strength, prism compressive strength and tensile strength, as well as relationships among prism compressive strength, tensile strength and cube compressive strength were analyzed and studied at different fiber dosages, and corresponding mathematical models were established; the results indicate that, fiber dosage has the most significant impact on tensile strength increase of cementitious composite; the ratio of prism compressive strength over cube compressive strength is not correlated with fiber dosage; and the ratio of tensile strength to cube compressive strength is a linear function of fiber dosage. The research result is of important reference to design and application of ultrafine copper-plated steel fiber reinforced composite.
Research on Frost Resistance of Recycled High Performance Concrete
Authors: Chen Chun Hong , Zhu Ping Hua , Wu Jun Yong , Yi Lei
Published: July 2014

The influence of recycled aggregates on the frost resistance of concrete was studied by rapid freezing-thawing test. Results showed that there was an important effect of aggregate gradation on frost resistance of recycled coarse aggregate concrete. Frost resistance of recycled fine aggregate concrete was deteriorated with increasing the content of recycled fine aggregate, and recycled fine aggregate had a greater influence on the frost resistance of recycled aggregate concrete than recycled coarse aggregate when adding both together. Test showed that the mass loss rate and the relative dynamic elastic modulus loss are not consistent as evaluation indexes of the frost resistance for recycled concrete, and whether the mass loss rate is suitable as an indicator of frost resistance durability needs to be further studied.
Experimental Study on Mechanics Performance of Polyvinyl Alcohol Fiber Reinforced Cement-Based Composites
Authors: Yang Zhong , Jiang De Bao , Gu Xiao Jing
Published: July 2014

Polyvinyl alcohol fiber reinforced cement-based composites are a new kind of material based on micro mechanics design. It is produced by adding polyvinyl alcohol fiber in the cement-based composites. In efforts to study the mechanical properties of polyvinyl alcohol fiber reinforced cement-based composites, some specimens were tested to examine performances. According to experimental investigation on mechanical properties, the stress-strain relationship curves and failure patterns are obtained. The test indicates that polyvinyl alcohol fiber reinforced cement-based composites have better toughness and fracture energy, and it has superior physical mechanical performance.
Performance Comparison Research of Different Level Density Brick Powder Foam Concrete
Authors: Dong Su Fen , Huang Zhi De , Qiao Yu Sen
Published: July 2014

Foam concrete has the potential to be one of the most development prospect thermal insulation materials because of green environmental, fire resistance, low cost, energy conservation and other advantages. Its defect is low strength, poor durability, especially for the low dry density. Different density level brick powder foam concrete performance was studied. The experimental results show that: as the design dry density increases, the 28 d compressive strength is increasing; bibulous rate is gradually reduced; carbonation coefficient is above 90%; the strength loss after freezing and thawing is less than 20%;when the design dry density is greater than 500 kg/m3, mass loss rate is increasing which is close to the internal bubble state; when the dry density is 500 kg/m3, the thermal conductivity coefficient of brick powder foam concrete is 0.106 w/(m • k).
Compositional, Structural and Mechanical Properties of (Ti,Cr,Al)N Coatings Deposited on the Surface of Piston Rings
Authors: Cai Zhi Hai , Qin Hang , Du Xiao Kun , Yang Zhen
Published: July 2014

A novel super hard coating system of (Ti,Cr,Al)N was synthesized by multi arc ion plating technology. The Metallic ratio of Cr, Ti, and Al was varied by adjusting the currents of different TiAl target. The CrTiAlN composite coatings with different chemical composition were deposited on the surface of 65Mn steels by multi-ion plating technology in a gas mixture of Ar+N2. The coatings were characterized by means of energy dispersive X-ray(EDX) analysis, X-ray diffractmetry(XRD), scanning electronic microscopy(SEM), microhardness tester respectively. The experimental results show that the deposition velocity of CrTiAlN coatings reached maximum value, about 72nm/min. And the surface morphology of CrAlTiN films are compact and dense. The main composition of CrTiAlN composite films is Cr、Ti、Al、N, with the mass percent of Cr 29.61%,Ti 21.42%,Al 14.88%,N 34.10%. And the cross-section morphology appears as fibrous columnar crystals structure. Compared with CrN coatings, the preferential growth orientation of CrAlTiN films was changed from CrN (111) to CrN (200) after the addition of Ti, Al element. When the TiAl target arc current was 50A, the hardness reached the maximum value, 35GPa.
Development Status of Laser Cladding Technologies
Authors: Qin Hang , Cai Zhi Hai , Zhang Ping , Yang Zhen
Published: July 2014

Laser cladding has received significant attention in recent years due to its unique features and capabilities in various industries involved in metallic coating, high-value components repair, prototyping, and low-volume manufacturing. The laser cladding technology research status was reviewed. The characteristics of laser cladding technology, process methods, materials systems and current problems were summarized. The prospects and future research priorities were forecasted.
The Effect of Mineral Admixtures on Mechanical Properties of High Performance Concrete at very Low Temperature
Authors: Zhang Nan , Liao Juan , Zhang Tao , Ji Wen Zhan , Wang Bao Hua , Zhang Dong Hua
Published: July 2014

The effect of very low temperature on high performance concrete (HPC) mechanical properties is studied by using a reasonable testing method. The results show that the compressive strengths of concrete are increasing with lower temperatures. Fly ash (FA), compared to ground granulated blast-furnace slag (GGBFS), is positive to the compressive strength increasing at low temperature. The splitting tensile strengths of concrete appear a maximum at-40°C~-80°C. The compound replacement by GGBFS and FA makes the splitting tensile strength present the extreme value at higher temperature. At very low temperature, the single or compound replacement by mineral admixtures can result in the difference of the relationship between compressive strength and splitting tensile strength, and the degradation of concrete subjected to cold-thermal shocks.
Analyses the New Building Wall Materials and Exterior Wall Thermal Insulation Technology
Authors: Sun Qiang , Shi Dong Xi , Wang Wen Bo , Xu Yu Shan , Zhu Lin , Hu Yi Feng
Published: July 2014

New building wall materials is a kind of material which is not at the price of consuming cultivated land, destruction of ecology and environmental pollution, adapting to the construction industrialization, construction mechanization, reducing wet construction operations at the site, improving the function of modern building construction. Presently, as for our country stage, new building wall materials is including all building wall materials except for clay solid brick building wall materials. In our country, the production of new type wall materials has been increasing rapidly and its quality and product has been improved obviously, what’s more, the technology and equipment level also rises fast which created very convenient advantages for the development of exterior wall thermal insulation technology. Presently, there are mainly three kinds which are the out-cell heat preservation, a polystyrene board and wall body casting molding at a time and polystyrene particles insulation pulp outer wall heat preservation.
The Design of High-Rise Building Based on City Space Planning
Authors: Yang Fang Fang
Published: July 2014

With the accelerating pace of city construction, high-rise buildings are gradually in the process of city development plays a more and more important role. In this paper, design of a high-rise building are analyzed, and puts forward the high-rise building design should be based on city space planning, as far as possible to reduce the interference to the city space environment. The design ideas of coordination, integration, humanity are also proposed, so as to enhance the image of high-rise buildings and the city's environmental quality.
Green High Performance Concrete Based on Sustainable Development
Authors: Zhang Ping , Cao Ying
Published: July 2014

Green high performance concrete is concrete materials which can reduce the load of the earth's environment, coordinate development with the ecosystem and create comfortable living environment. The relationship between the construction materials and the sustainable development and the characteristic of green high performance concrete were introduced, the measures of green concrete production was analyzed and the work essential for the development of green high performance concrete was proposed in this paper. The research shows that the development of green high performance concrete is the inevitable way for the sustainable development of concrete.
Interventions of Retarders on the Hydration Process of CaO Expansion Clinker
Authors: Gao Xiu Li , Xu Wen , Li Hua
Published: July 2014

The volume deformation test, differential scanning calorimetry and chemical titration technique were used to experimentally research the interventions of retarders on the free autogenous volume deformation of cement paste doped with CaO expansion clinker at different ages systematically, as well as the hydration rate and hydration process of CaO expansion clinker. Two types of retarders were used as following: sodium gluconate and sodium citrate. The experimental results show that the two retarders can delay the hydration process of CaO expansion clinker, slow down its hydration rate both in pure water and cement paste. At the same time, the free autogenous volume deformation of cement paste was increased. In this sense, the use of retarders is favorable to improve the expansion efficiency of CaO expansion clinker.
The Research on Environment Design of Senile Apartments
Authors: Wang Rui , Sun Ya Feng
Published: July 2014

Since senior citizens spend most of their time indoors, an apartment for the elderly has become a gathering place for senior citizen, which is equipped with a complete range of domestic installations and perfect public facilities especially for the aged. The indoor environment design of senile apartments has the direct bearing on the quality of senior citizen’s indoor life, their security, health and comfort and so on.
Cotton Stalks Cement-Based Block Material and its Preparation Method
Authors: Chen Guo Xin , Wang Jia Hui , Chen Liang Liang , Lv Xin Min
Published: July 2014

In Xinjiang, by making use of cotton stalks after cotton picked, people researched and developed a kind of walling material that is cotton stalks cement-based blocks, elaborated its preparation methods, and evaluated its technology effect of cotton stalks cement-based block material. Results show that the cotton stalks cement-based block material have good properties like wide source, easy processing and wonderful performance; by soaking cotton straw broken material with alkali liquor, made cotton straw plant fiber reinforced material and the cement matrix have good interface adhesion; the block material is provided with load-bearing, heat preservation performance and cracking resistance, it can be used for low-rise buildings bearing wallboard and retaining wall of multiple floors in cotton planting region.
Experimental Study of Frost-Resistance Properties of Silica Fume Concrete
Authors: Yin Zhi Gang , Feng Jun , Huang Shu You , Zhao Bing Fang
Published: July 2014

The frost resistance of low strength concrete is researched. In order to evaluate the effect of different content of silica fume on frost resistance，the quality of the cement 6%, 9%, 12% silica fume are respectively added into concrete. Freezing-thawing test results show that: the silica fume concrete has good frost resistance. Content of silica fume on concrete is not almost effect to quality loss rate. In 0-250 times of freezing-thawing cycle range, it is smaller that relative dynamic elastic modulus change rate. Relative dynamic elastic modulus of ordinary concrete decreases rapidly after 250 times of freezing-thawing cycle while dynamic elastic modulus decrease rate of the silica fume concrete tends to slow. The freezing -thawing cycles up to 350 times, silica fume concrete relative dynamic elastic modulus is 1.5 times that of ordinary concrete that show the silica fume concrete frost resistance is better than that of ordinary concrete.
Experimental Study on Impact Resistance of PVA Fiber Reinforced Cement-Based Composite
Authors: Cai Xin Hua , He Zhen , Liu Wen
Published: July 2014

PVA fiber reinforced cement-based composite is a new high-performance cement-based composite material, which usually manufactured with PVA short fibers (does not exceed 2.5% vol.) and cement-based matrix. It has a significant strain-hardening characteristic and excellent crack controlling ability. Its ultimate tensile strain is up to 3% and crack width is not exceed 100μm. PVA fiber reinforced cement-based composite can be utilized to fabricated high energy absorption opponents, such as protective shield, seismic joint, impact-resistant site, etc. In this paper, the basic mechanical properties of PVA fiber reinforced cement-based composite has been tested and verified first. Then the impact resistance of PVA reinforced cement-based composite has been investigated via drop weight impact test, and compared with ones of plain concrete and steel fiber reinforced concrete with the same strength grade. Through analyzing the test results, it is concluded that PVA reinforced cement-based composite’s impact energy absorption is 48 times than plain concrete, and 9 times than steel fiber reinforced concrete respectively. The impact numbers of PVA reinforced cement-based composite is slightly lower than steel fiber reinforced concrete, but its impact absorption energy after initial cracking is 15 times than steel fiber reinforced concrete. In conclusion, PVA reinforced cement-based composite is an excellent impact material.
Discussions on Materials Selection and Design of Colored Hot-Mix Asphalt Mixture
Authors: Liu Qin Qin , Peng Zi Mao , Lin Meng Jie
Published: July 2014

Firstly, based on contrast to the the merits of conventional asphalt, natural colored asphalt, bitumen thermoset and thermoplastic light colored asphalt, the paper proposed the base asphalt selection method. Then on the basis of comparison of the performance of organic pigments and inorganic pigments of paint, the pigmentselection method was identified. Thirdly, the paper compared the color characteristics of different types of stone and provided some recommendations on aggregate selection. Finally, the paper briefly introduced the design method and technical requirement of colored hot-mix asphalt material.
Research of Novel High-Temperature Proton Exchange Composite Membrane
Authors: Zhang Dong Xia , Zou Jing , Zhang Yong Ming , Zhang Mei , Dang Dan Dan
Published: July 2014

Polyaniline (PANI) and phosphoric acid (PA) doped sulfonated polybenzimidazole (SPBI) composite membrane was prepared.Thermal stability of the pure SPBI copolymer was investigated by TGA measurements. The proton conductivities and physical properties of the membrane were studied.
The Dependence of the Setting Temperature on the Concentration of Plasticizer
Authors: Matseevich Tatyana , Popova Marina , Kondrashchenko Valerii , Askadskii Andrey
Published: July 2014

The theoretical analysis regarding the influence of the chemical structures both of polymer and plasticizer on the glass transition temperature has been produced. The analysis is made based on the Askadskii equation allowing Tg calculation of polymers. The phenomenon of blocking polar groups of the polymer by the molecules of plasticizer is taken into consideration. Also the effect of dilution was considered. The analytical expression for concentration dependence of the glass transition temperature is obtained, and a good agreement between the experimental and calculated data is provided.
Study on early Mechanical Performance of High Performance Concrete with Low Clinker Influenced by Rubber Powder
Authors: Meng Qing Hai , Lv Li Hua , Yan Xu
Published: July 2014

Selecting rubber powders, which is divided into 80 mesh and 150 mesh, as the research object, to understand the influence of high performance of lower clinker concrete mechanical properties of rubber powder with different varieties and volume. Taking the compressive strength, flexural strength and ratio of flexural strength to compressive strength as an indicator, the thesis explores the influence of the high performance concrete with low clinker, which rubber powder are mixed into as fine aggregate, on the compressive strength bending strength and ductility.
Adjust Compositions to Produce High Strength Steel Bars for the Building Industry
Authors: Zhang Tie Jun
Published: July 2014

In order to produce required high strength steel bars for the building industry, it is necessary to provide steel with correct compositions. Effective, controlled micro-alloying is very important in the production of high strength steel bar of consistent microstructure and hence mechanical properties and weldability. Through adopting a series of measures such as molten iron pretreatment, converter final control, argon, calcium treatment, vanadium nitride and so on, a proper way to make high strength steel bar was given. The results show that the strength of the steel bars for the building industry can be increased by micro alloying with vanadium nitride. Favorable metallurgical achievements and economical benefits were gained.
Proportion Design of Polymeric Cement Concrete Based on Volumetric Analysis
Authors: Bai Wei , Zhang Jian
Published: July 2014

Polymeric Cement Concrete (PCC) is used for function layer of pavements throughout the world owing to its better and economical performance than cement concrete pavements and asphalt pavements. However, the problem associated with the PCC layer is the proportion design method with traditional checking trial batches method. In this paper, asphalt mix proportion design experience was referenced in PCC mix design. The Fuller Cure was used to determine the aggregate gradation, and a filling index Dp was referenced in PCC mix design. The laboratory tests were done including the strength test (tensile strength and compressive strength), texture depths, the British pendulum number (BPN) and the noise with the method of accelerating-falling tire.