bluuebunny/crossref_metadata_2025 huggingface dataset:
Urban Ecological Territory Model: Discussion and Application
Authors: Qin Meng Lin , Zheng Wei , Bushman Bryce
Published: May 2011

The urban ecological territory model uses traditional ecological evaluation methods, such as ecological carrying capacity and ecological footprint, to create a new urban ecological model that uses a quantified spatial structure. This new model allows for the quantitative analysis of indicators such as ecological efficiency, quality, security, and fairness. The paper presents an example application of the model through a comparative analysis of two cities. Analyses using the new model can be used to guide urban development policy decisions.
Dynamic Characterization of Cement-Treated High-Speed Railway Subgrade
Authors: Yang Guang Qing , Wang Xi Zhao , Zhang Bao Jian
Published: May 2011

In order to ensure the high-speed railway train running safety and stabilization, the subgrade should keep adequate strength, rigidity and long-term stabilization under the repeated train load. When the subgrade soil is poor, we can treat it with cement. Whether the performance of cement-treated soil can meet the demand of high-speed railway, so the dynamic triaxial test of cement-treated soil is studied in this paper. The dynamic performance of cement-treated soil under repeated train load is analyzed. The variation and influence factors of critical dynamic stress, accumulated plastic strain, elastic strain and resilient module of cement-treated soil are studied.When the dynamical stress more than the critical dynamical stress, the cumulate plastic strain and the elastic strain will rapidly increase with the increase of the loading time of the dynamical stress. The resilience modulus will decrease along with the increase of the dynamical stress. When the dynamical stress less than the he critical dynamical stress, the elastic strain and the resilience modulus remain constant with the increase of the loading time of the dynamical stress. And the elastic strain and the resilience modulus linearly increase with the increase of the dynamical stress.
Research Status and Prospects of the Self-Repairing Concrete
Authors: Sun Jie , Ding Wen Xia
Published: May 2011

Self-repairing concrete is that adhesive agent is composited inside the concrete to form the self-repairing system and automatically repair the damaging materials. It can solve some problems that are difficult to be solved by the traditional methods. The development background of the self-repairing concrete and the present research at home and abroad were reviewed. The existing problems of the present studies were also elaborated. Moreover, the development trend and the application prospect of the self-repairing concrete were forecast.
Study on a Landscape-Designed Ecological Barrier for Remediation of Micro-Polluted Water
Authors: Chen Xiao Qiang , Wang He Li , Zhu Xiao Jing
Published: May 2011

As the lake water of Yuyuantan Park of Beijing has became micro-polluted water after the cycles of social landscape and the micro-polluted water run into the Kunyu River, the research adopts a method of manual simulation to treatment the micro-polluted water with a new-type of compound pattern we call landscape-designed ecological barrier which consists of ecological pond and constructed wetland . In order to weak the adverse effects of micro-polluted water on natural water, this new-type of compound pattern forms a landscape-designed ecological barrier. After 5 months experiment, results show that the landscape-designed ecological barrier has a better removal of pollutants. The removal rates of COD, TN and TP respectively reached 65.2% ~ 73.6%, 62.5% ~ 66.0% and 70.0% ~ 80.0%. And the effluent quality can reach III - IV water-quality of environmental quality standards for surface water(GB3838-2002). In Autumn, the concentration of CODCr, TN and TP in effluent sustain at IV water-quality of environmental quality standards for surface water(GB3838-2002), and at the same time create artificial landscape water with environmental aesthetic and ornamental value, bring the benefit of water resources as well as positive ecological environment effects into full play synthetically.
Nonlinear Forced Vibration for Shape Memory Alloy Spring Oscillator
Authors: Shang Ze Jin , Wang Zhong Min
Published: May 2011

The recovery force of shape memory alloy spring is described by using polynomial constitutive equation. The nonlinear dynamic model of forced vibration for the shape memory alloy spring oscillator is derived. Numerical simulations are performed by a fourth-order Runge-Kutta method. The bifurcation diagram and Lyapunov-exponent spectrum are presented while the dimensionless temperature, the dimensionless damping coefficient or the dimensionless amplitude of exciting force is varied respectively, thus the bifurcation of the system is investigated. Furthermore, the periodic and chaotic motions of the system are analyzed by means of the displacement time history diagram, the phase portrait, the Poincare section diagram and the power spectrum with different parameters. The results show that the periodic or chaotic motion of the system occur by changing temperature, damping coefficient and amplitude of exciting force, thus the vibration of the system could be controlled.
Interfacial Transition Zone Characteristics of Light-Burnt MgO Concrete
Authors: Chen Xia , Yang Hua Quan , Shi Yan , Xiao Kai Tao , Lin Yu Qiang
Published: May 2011

The morphology and elements enrichment in the vicinity of interfacial transition zone was investigated with employment of SEM, EDS and BEI. Results indicated that the morphology of products of hydration in ITZ area and cement matrix was similar but differed in amount, size and crystal features. Elements Ca, Si, Al and Mg had tendency to enrich in ITZ zone but differed in accumulation extent in orders. MgO was non-uniformly distributed in concrete, fully mixed in construction though, richer in cement matrix than in ITZ, yet MgO later inclined to migrate to ITZ area and the gap in between was mitigated with in-depth hydration.
Research on the Mechanism of Tourism Industry Association-Oriented Crisis Management
Authors: Wu Qian , Hu Xin , Wan Meng
Published: May 2011

With the deepening of economic globalization, China’s Tourism industry has been developing positively, but also accompanied with increasing amount of crisis. On the basic of the systematic analysis of tourism crisis and its characteristics, we treated the Tourism Industry Association as managing subject and put forward the mechanism of crisis management for the Tourism Industry Association in dealing with tourism crisis. Aiming to improve the tourism industry’ capability against risks and provide theoretical guidance for Tourism Industry Association better plays the role of assisting government and guiding enterprises.
A Model of Batch Grinding of Talc Powders
Authors: Xie Hong Yong , Yuan Hao , Guan Jie
Published: May 2011

Grinding of talc powders has been studied both theoretically and experimentally. The specific rates of breakage of talc powders were measured based on the first-order breakage kinetics model and the cumulative breakage distribution parameters of talc powders were measured from primary breakage products. Based on the measurement results, the specific rate of breakage and cumulative breakage distribution functions were correlated with particle size asand , repectively. A differential-integral equation was thus build to describe grinding as a rate process and was integrated numerically. Comparisons on size distribution showed that the specific rate of breakage of talc powders increased with grinding time at an increase rateabout 0.0066min-2.
Latest Developments of Materials Used in Transmission Tower Structure
Authors: Li Mao Hua , Yang Jing Bo , Li Zheng
Published: May 2011

This paper discusses the status quo and development trend of transmission tower materials, points out that there will be higher requirements on the varieties and specifications of transmission tower material alongside the continuous construction of power grids. Tower materials will develop in the environmental-friendly, high-strength and conservation-oriented trend. In the future, the demand for Q420, Q460 high-strength and large-width angle steel will grow enormously; the steel tubular tower will be used in transmission lines more widely due to its excellent carrying capability; new materials like weathering cold-formed steel and composite material will be gradually used in transmission towers.
Study on Self-Healing Concrete with Pre-Embedded Healing Agent
Authors: Zhang Ming , Xing Feng , Cui Hong Zhi , Lu Han
Published: May 2011

Self-healing concrete is a kind of smart concrete, and becoming one of research focus both in material and civil engineering field, in the paper, main self-healing methods concluded and partial technical problems of the self-healing facing, aim to these problems designed a kind of novel self-healing system, and experimental analyzed mechanism of self-healing.
Activity Model Calculation in Slag Based on Artificial Intelligence and its Application in the Ternary Slag System
Authors: Jiang Zhou Hua , Gong Wei , Wu Ling
Published: May 2011

A model based on neural network for predicting the activity of components in multiple slag system is developed. The artificial neural nets can implement any approximation of function with simple structure, while the genetic algorith is a globally optimized search one based on genetics and natural selection theory, which is available to implement the iteration process through alloying the genetic manipulation to the individuals in colonies for their restructuring and then evolve the increasingly improved approximate solutions generation by generation in accordance to the adaptability function for individuals. GA is always used to give the weight and threshold of neural nets. Computing and simulating the MnO-SiO2-Al2O3 and FeO-MnO-SiO2 slag systems, it is found that the model has high nonlinear capability and the computation results fit well with that in relevant earlier works, thus enabling the accurate prediction of the activity of components in molten slag.
The Improvement of Newton Method and the Validation of Optimization Idea of Blind Walking Repeatedly
Authors: Zhang Chun Ling
Published: May 2011

The existence of maximum point, oddity point and saddle point often leads to computation failure. The optimization idea is based on the reality that the optimum towards the local minimum related the initial point. After getting several optimal results with different initial point, the best result is taken as the final optimal result. The arithmetic improvement of multi-dimension Newton method is improved. The improvement is important for the optimization method with grads convergence rule or searching direction constructed by grads. A computational example with a saddle point, maximum point and oddity point is studied by multi-dimension Newton method, damped Newton method and Newton direction method. The importance of the idea of blind walking repeatedly is testified. Owing to the parallel arithmetic of modernistic optimization method, it does not need to study optimization problem with seriate feasible domain by modernistic optimization method.
The Effect of Explosive Material on the Formation of Explosively Formed Penetrator
Authors: Miao Qin Shu , Wang Xiao Ming , Li Wen Bin , Li Wei Bing , Zheng Yu
Published: May 2011

In order to research the effect of explosive material on the formation of EFP, this paper studies the effect of five different explosive materials, PETN, SEP, TNT, PE4BOOSTER and 8701, on forming EFP, using ANSYS/LS-DYNA simulation software. It obtained the influence of the material character of the explosive on the formation parameters of EFP, such as velocity and length-diameter ratio. It can be found that, when the density of explosive increases from 1.26g/cm3 to 1.7g/cm3, the velocity of EFP increases by 50.8%, and the length-diameter ratio improves by 2.16 times. It is good to choose the explosive with high energy and speed in design charge warhead at the same condition. The simulation results were validated through X-ray imaging experimentation. Both results are in agreement well.
The Creation of Contemporary Public Art - Five Elements Concept
Authors: Lv Wei Lu , Xu Shan Shan
Published: May 2011

Chinese tradition philosophy traces back to five thousands year ago. As a branch, Five Elements originally belonged to Chinese Natural Philosophy，but widely permeated into social system, culture, science, urban plan and linguistic literature during the development. Currently, public art establishes a brand new interaction relationship between human beings and objects by making use of rich material language and practicing the integration of art form and concept. It reflects the spirit value of culture opening, sharing and communicating in the space that has become increasingly recognized and accepted by people.[1] No matter the expression form or concept of artists, both reveal the close contact between Chinese tradition culture and philosophy. In order to promote the development of public art, this study explores the internal connection between Five Elements and Public Art through analyzing the connection of material language and application of artistic creation.
Correlations between Fresh Properties of Self-Consolidating Concrete Including Palm Oil Fuel Ash
Authors: Safiuddin Md. , Salam Md. Abdus , Jumaat Mohd Zamin
Published: May 2011

Palm oil fuel ash (POFA) has been used successfully as a supplementary cementing material in various types of concrete. In the present study, self-consolidating concrete (SCC) was produced by using POFA as a partial replacement of ordinary portland cement (OPC). In total, sixteen SCC mixes were prepared by varying water to binder (W/B) ratio, POFA content, and high-range water reducer (HRWR). POFA was used by replacing 0–30% of OPC by weight at the W/B ratios ranging from 0.25 to 0.40. The filling ability, passing ability and segregation resistance of various SCC mixes were investigated. The filling ability was determined with respect to slump flow, 50-cm slump flow time, inverted slump cone flow spread and time, and V-funnel flow time. The passing ability was examined with respect to J-ring flow. In addition, the segregation resistance was assessed with regard to sieve segregation index and column segregation factor. Based on the data obtained, the correlations for the fresh properties of SCC were sought. The experimental findings showed strong correlations between most of the fresh properties of SCC.
Tensile Creep Behavior of HPC at Early Ages under Different Curing Temperatures
Authors: Yang Yang , Li Peng , Wu Yan Ping
Published: May 2011

This paper presents an experimental investigation on tensile basic creep behavior of HPC at early ages by using a uniaxial tensile creep testing apparatus. Concrete specimens of 100×100×400mm with compressive strength class 60MPa was used, sealed and loaded at different curing temperature. The effects of the curing temperature and the age at loading on creep behavior are discussed. The results show that tensile specific creep and creep rate of HPC at early ages were governed by the age at loading. The specific creep, creep coefficient and creep rate were larger at earlier loading ages, and decreased exponentially with age at loading. The tensile specific creep decreased with curing temperature, but the difference in creep due to different curing temperatures decreased with the age at loading, and could be ignored while concrete specimen being loaded after the age of 7 days.
Orthogonal Test of Characteristics of Complex Cememting Material of FGD Gypsum-Fly Ash
Authors: Zhang Yi , Wang Xin Tang , Zhou Ming , Wang Wan Zhen
Published: May 2011

Orthogonal test method is used to study the effect of the mineral admixtures on the performance of FGD gypsum-fly ash complex cementing material. On the basic experiment, the effect of the traditional alkali and salt admixtures added to the complex cementitious system is discussed, the factors effecting on performance of the FGD gypsum were analyzed. Based on the experimental results, the best mix proportion was determined. Finally, the basic performance of complex cementitious material was tested. The experimental results show that the performance of FGD gypsum which is activated through adding the compound admixtures was similar with the ordinary interior wall materials. The strength and water resistance of FGD gypsum complex cementing material can be greatly enhanced by adding cement, quicklime and slag powder, and effect of cement is largest, and slag smallest. The performance of the gypsum complex cementing material also can be improved after incorporation of a few of chemical admixture on the basis of adding mineral activators.
Fireproof Performance of Foam Concrete Insulation Board
Authors: Yu Shui Jun , Wang Yu Long , Duan Ben Jie , Zhou Jun Wei , Yang Fei , Wang Xu Ge , Liang Dong Lin
Published: May 2011

Foam concrete is used in building energy-saving insulation works, to study its fire performance is very important for further enhancing the fire performance of buildings. Under simulated fire conditions, by determining the compressive strength of foam concrete at different densities, different calcination time and different water content, this experiment studies the effect of these conditions on the fire performance of foam concrete. The results show that in case of fire, the compressive strength loss rate of foam concrete increases with the decreasing of density; to calcine the foam concrete standard specimens whose density are 300kg/m3 and 800kg/m3, their strength loss rates are 66.3% and 25.5%, the compressive strength of foam concrete in the same density increases with the calcination time decreasing, water content has different effects on different densities of foam concrete in the fire security. The foam concrete is non-flammable, but its compressive strength decreases due to the fire of combustible materials and high-temperature calcination.
Experiment and Research on the Influence of Basalt Fiber on Cement-Based Material Performance
Authors: Cong Xiao Hong , Sun Jing , Zhao Fei , Liu Hong Bo
Published: May 2011

As reinforced material, basalt fiber is added into cement-based material. In this paper, the influence of basalt fiber on the performance of cement-based material is made experiment to look for the more appropriate. The content and length of basalt fiber is the important factors affecting the fluidity, flexural strength and compressive strength.
Experimental Study on Thermal Expansion Properties and Micro-Pore Texture of High Strength Concrete in Early Age
Authors: Wang Ai Kai , Xue Ya Dong , Wang Rui , Lv Suo Xiang , She Xiao Kang , Li Bo , Tian Heng Jiao
Published: May 2011

The early age cracking of concrete is concerned with its thermal expansion properties, which is mainly reflected by the thermal expansion coefficient. Reasonably controlling the coefficient is an effective way of reducing cracks in the early age of concrete. While thermal expansion properties are related to the micro-pore texture characteristics of the concrete. Micro-pore textures of concretes of different mixing ratios and curing time were measured via mercury intrusion porosimetry (MIP), and the thermal expansion coefficient was determined by the comparator. The analysis of test results indicates the correlation between the parameters of micro-pore texture and thermal expansion properties, and also shows a highly positive correlation between the pore area and the thermal expansion coefficient. The results provide a solution for reducing the thermal expansion coefficient, thus controlling the early age cracking.
A Novel Building Thermal Insulation Material: Expanded Perlite Modified by Aerogel
Authors: Wang Zi Sheng , Tu Hao Chi , Gao Jin Xiu , Qian Guo Dong , Fan Xian Ping , Wang Zhi Yu
Published: May 2011

Aerogel is regarded as one kind of super thermal insulation materials which could be large-scalely used as building materials. However, the aerogel’s production cost and poor mechanical property limit the its applications. In this paper, we put forward a new low cost way to produce a novel building thermal insulation material: synthesized the aerogel within the expanded perlite’s pores, and using sodium silicate as precursor without adopting supercritical fluid drying and surface modification. The thermal conductivity of expanded perlite was successfully decreased after modified by aerogel.
Study for Aeolian Sand Characteristics by Static Experiment
Authors: Song Yun Lian , Zhang Ya Wei , Yu Jing
Published: May 2011

The representative aeolian sand taken from Horqin desert freeway is used as Subgrade Material. In this paper, California Bearing Ratio (CBR) and rebound modulus E0 are analyzed by experiments which are based on different aeolian samples with different compaction degree, different dry density and different moisture capacity. Simultaneously, the relation of stress and strain is studied to summarize the mechanical strength characteristic of aeolian sand under different compaction criterion. According to carrying capacity of aeolian sand, statics properties are analyzed. Experiment results show that aeolian sand is compacted under the natural moisture capacity in subgrade engineering, which is feasible and effective. The CBR of the compacted aeolian sand should be controlled less than 10% during construction.
Compressive Properties of Steel Fiber Reinforced Ultra High Strength Concrete
Authors: Su Jun , Tao Jun Lin , Li Tang , Yin Yan
Published: May 2011

The compression tests were carried out to investigate the compression behavior of steel fiber reinforced ultra high strength concrete(SFRUHSC). Cubic and axial compression specimens were tested at room tempreture, in terms of load control. The result shouwed that the compression strength of 150×150×150mm3and 100×100×100mm3 cubic specimens is 108.4MPa and 94.7MPa, while the 100×100×300mm3 axial specimens’ is 73.4MPa. The above data demonstrated that the different size effect from that of strength of steel fiber reinforced concrete(SFRC), namely the strength of 100×100×100mm is larger than that of 150×150×150mm3. Two kinds of compression specimens showed various fracture mode: ductile tension fracture of cubic specimens and the brittle shearing fracture of axial ones. But the steel fibers inside the specimens had been pulled out from the matrix.
A Study of Thermal Performance on Cool Colorful Water-Based Reflective Coatings for Building
Authors: Wang Pei , Lv Wen Yan , Wei Zhi Yong , Zhang Xia Zhen , Liu Lian , Zhang Wan Xi
Published: May 2011

This paper presented the results of a comparative study aiming to investigate the effect of reflective coatings on lowering surface temperatures of matrix. Moreover, the important factors of the amount and the color of colored hollow-ceramic micro sphere were discussed. It was demonstrated that the use of reflective coatings could reduce a white surface temperature by 6.5 °C compared to a sample. The temperature difference became to reduce while the color of coatings turned to dark from the white to the yellow.
Preparation and Properties of MgO-MgAl2O4-FeAl2O4 Bricks in Cement Kiln
Authors: Ma Shu Long , Li Yong , Sun Jia Lin , Li Yue , Xia Wen Bin
Published: May 2011

Sintered magnesia with different particle sizes, fused MgAl2O4and FeAl2O4were used as the raw materials. FeAl2O4is added in MgO-MgAl2O4bricks at different ratios to gradually replace MgAl2O4. After the raw materials were molded and sintered at the tunnel furnace with the temperature 1 530°C for 10 hours, the MgO-MgAl2O4-FeAl2O4bricks could be made. After the analysis of the phase composition, microstructure and routine performance of the specimens, the influence by adding FeAl2O4to the samples on the properties such as thermal shock resistance, adhesion strength of kiln crust are discussed as the key point. The result shows that the addition of FeAl2O4has no evidently influence on the apparent porosity and volume density. The cold compressive strength of the samples reduces gradually with the addition of FeAl2O4, and it decreases obviously when the amount of FeAl2O4is more than 8%. When the addition of FeAl2O4is 5% FeAl2O4in the MgO-MgAl2O4-FeAl2O4bricks, MgAl2O4and FeAl2O4can combine each other’s advantages. The thermal shock resistance not only decreased obviously but the adhesion strength to kiln crust is increased.
Research on the Properties and Application of Spheroidizing Pumice Concrete Block
Authors: Weng Wei Su , Liu Zhong Yang , Wang Li Wen
Published: May 2011

At present, wall materials innovation and energy-saving building construction face the new situation in China. Using local rich natural resources and industrial waste to make light-weight concrete buliding block instead of clay brick is one of the most effective measures. This paper expounds the research on pumice and its concrete, and the testing result indicates the pumice after being properly machined and spheroidizing hole sealing can be used to make hollow block, which performance can well meet the need of wall materials.
Statistical Evaluation for Impact Resistance of Steel Fiber Reinforced Lightweight Aggregate Concrete
Authors: Song Hong Wei , Wang Hai Tao
Published: May 2011

The impact resistance of steel fiber reinforced lightweight aggregate concrete was presented in a drop weight test. In this test, 5 groups of disc specimens with different steel fiber volumes including 0.0%, 0.5%, 1.0%, 1.5% and 2.0% were tested. The experimental results indicated that the impact resistance of lightweight aggregate concrete is improved with the increase in fiber volume. As the variation in experimental results, a statistical evaluation was performed to study the influence of impact resistance of steel fiber reinforced lightweight aggregate concrete with different steel fiber volumes. Further more, the impact resistance was simulated with probability distribution by Log-normal method. And the goodnees-of-fit tests indicate that the Log-normal method has good fitness to the impact resistance of steel fiber reinforced lightweight aggregate concrete.
The Impact of Barium Aggregate on the Microstructure of Sand-Lime Products
Authors: Dachowski Ryszard , Stępień Anna
Published: May 2011

This paper presents an experimental study on sand-lime bricks. The purpose of this research is to examine different materials as modifiers, in particular barium aggregate. Undoubtedly, the properties of the sand-lime products depend on many factors such as raw materials, preparation or autoclaving conditions, etc. The research was carried out and analyzed by scanning electron microscope (SEM) in order to improve acoustic isolation of calcium silicate bricks. As a result, it was possible to determine the phase composition in the structure of the calcium silicate products.
Research on Improving the Durability of Fly Ash Concrete
Authors: Quan Hong Zhu
Published: May 2011

The purpose of this study was to improve the durability of fly ash concrete. As a result, by making fly ash concrete into non-air-entraining type and using durability improving admixture, the compressive strength of fly ash concrete increases 10%~30%, reducing initial compressive strength defects; drying shrinkage is controlled at 60% compared to when the mixture is not added; carbonation of fly ash concrete can be considered roughly proportional to water-cement ratio regardless of water-binder ratio or fly ash replacementratio; the freeze damage resistance improves for 2 weeks curing in air (drying process). Finally, by making fly ash concrete from non-air entraining type and using durability improving admixture, the difficulty of controlling air content in fly ash concrete is reduced and quality management is simplified.
Study on the Simulation of Damage Constitutive Relationship for High Strength and High Performance Concrete
Authors: Zheng Shan Suo , Hu Yi , Liu Bin , Xie Ming , Tao Qing Lin
Published: May 2011

The damage evolution laws of high strength and high performance concrete (HSHPC) are obtained by a large number of experiments on mechanical properties. Based on stochastic damage model, a new damage variable with two parameters is proposed to describe the damage constitutive relationship of HSHPC and the damage constitutive equation is established by boundary conditions. Compared mechanical test result of HSHPC with theoretical calculation, it is shown that the damage constitutive equation can reflect the damage characteristics of HSHPC reasonably. The research identifies a certain theoretical basis for further studying on dynamic and stochastic damage constitutive relationship of HSHPC.
Study of CaCO3 Whiskers: Preparation and Applicability in Construction Materials
Authors: Wei Jian Qiang , Cao Ming Li
Published: May 2011

As a new type of fibrous material, CaCO3whisker has played an increasingly important role in the fields of instrumentation, polymerscience and artificial bones. In order to give full play to CaCO3whisker’s novel micro structure, excellent mechanical properties and stability, we initially applies it to advanced cement based construction materials. The preparation methods, characterization of CaCO3whisker and its applicability in advanced construction materials were studied thoroughly, based on the latest literatures and our newest research works.
Experimental Study on Mechanical Properties of New Self-Compacting Concrete for Strengthening Engineering
Authors: Hu Ke Xu , Zhang Yan Bo , Xu Kai
Published: May 2011

Base on the practical experience of reinforcing engineering and the application of new type of cement based grouting material in recent years, a new type of cement-based concrete for strengthening engineering with high-bonding, low-shrinking, self-compacted was developed in this paper. Fast-speed strengthening and repairing of structures can be realized by combining this new strengthening material with the traditional method of increasing section area for strengthening, and by the adoption of the technology of perfusion pumped on-site. This new strengthening concrete can be applied to both reinforced concrete structures strengthening and masonry structures strengthening. Compared with the traditional strengthening method of increasing section area, due to smaller section needed, the construction speed is quicker, and the quality can be more easily guaranteed. Therefore, this new type of material possesses a wide application prospect. And a series of experimental researches on the mechanical properties of this new strengthening concrete is conducted in this paper.
Configuration and Pyrological Performance of Self Thermal Insulating Blocks
Authors: Ma Xin Wei , Yang Li Xiong , Ji Yu Yan
Published: May 2011

Energy conservation is a hot topic in the field of construction. To increase the thermal resistance of the enclosing structure of buildings, a T-shaped self thermal insulating block is designed. The particular shape, light weight concrete shell and heat insulating materials filled in the cavities result in a good heat insulating effect. Thermal bridges on the wall can significantly be reduced, which leads to a great improvement in thermal resistance, and performance of energy conservation. The thermal conductivity of wall made of this kind of blocks could be as low as 0.088W/ m·K, by which energy consumption could be saved by 65% comparing with wall made of bricks in 1980s.
Comparative Experiment on Frost Resistance of Different Kinds of Polymer Fibrous Concrete
Authors: Shi Zhen Wu , Liu Shuang , Zhang Rui Rui
Published: May 2011

Based on the evaluation of fibrous concrete materials and the experiments of freezing-thawing resistance home and abroad, the present experiment takes relative dynamic modulus of elasticity and rate of mass reduction as an analytical index to conduct a comparative study on the effects of the mixing of four kinds of polypropylene fiber on the cement concrete freezing resistance. The results show that different kinds of polypropylene fiber have different influences on cement concrete freezing resistance. And some polypropylene can improve it while others may make it decreased.
Studies on Improving PP Fiber Reinforced Concrete
Authors: Chou Liang Hsing , Lu Chun Ku , Lee Maw Tien
Published: May 2011

Grafting method was used to modify polypropylene (PP) fiber to enhance the fiber reinforced concrete in this study. Polyacrylamide (PAM) was grafted onto PP surface by UV radiation using benzophenone (BP) as a photoinitiator. The microstructure of PP, and the interaction force between PP and the polar probe were observed with an atomic force microscopy (AFM). Experimental results showed that the roughness of PAM-grafted PP surface decreased significantly in comparison with that of the untreated PP surface. In addition, instead of smooth force curve as that of the untreated PP, the interaction between the probe and PAM-grafted PP surface appeared an oscillation. The above results gave the evidences that PAM had been successfully grafted onto the PP surface as discussed . The high hydrophilic property of PAM modifies the surface property of PP fiber and strengthens PP fiber reinforced concrete.
Effect of Air Plasma Treatment on Property of PET Fibers Used in Conductive Asphalt Concrete
Authors: Ruan Fang Tao , Jin Xin , Wang Wen Yu , Xiao Chang Fa , Xie Chun
Published: May 2011

In this paper, polyester fibers (PET) were treated with low temperature plasma firstly. Then, these plasma treated PET fibers were coated with polypyrrole (PPy) by pyrrole deposition polymerization to impart conductive property to the fibers. Interfacial shear strength (ISS) between PET fiber and asphalt was measured by single fiber pull out test. XPS and SEM were used to characterize the fibers’ surface configuration and analysis the functional groups. The results show that plasma-treatment has a strong effect on the surface morphology, surface elements, electrical property and the ISS.
Synthesis and Water Absorbency of Poly(acrylic acid-co-acrylamide)
Authors: Li Ting Xi , Kong Na , Gao Su Su , Sui Peng , Zhao Yu Hua , Yuan Cheng Qian
Published: May 2011

A new type of poly (acrylic acid-co-acrylamide) was synthesized by copolymerization method using acrylic acid (AA) and acrylamide (AM) as monomer. Synthesis technology was as follow: the acrylamide and acrylic acid molar ratio was 0.3-0.4, the temperature was 55-60°C, the degree of neutralization of AA was 70%, the potassium persulfate and monomer mass ratio was 0.2%-0.3%, the aluminum hydroxide and monomer mass radio was 0.03%-0.05%. The water absorption was more than thousands of times.
Experimental Study on Dynamic Characteristics of Sandy Pebble Soil
Authors: Chen Xiao Qiang , Jia Bin , Yao Yong , Chen Dai Guo
Published: May 2011

Through the laboratory dynamic triaxial test of sandy pebble soil, evolution law of influence of confining pressure and vibration frequency on dynamic strength is analyzed. Analysis indicates that dynamic stress of sandy pebble soil improves in a large degree with accretion of vibration frequency, dynamic strength of which increases significantly with confining pressure rising, and relation of dynamic stress and dynamic strain can also be symbolized with the R.L.Kondner hyperbola curve. Meanwhile, dynamic elastic modulus of sandy pebble soil decreases with growth of dynamic strain, while increases with growth of consolidation pressure.
High Temperature Rheological Characteristics of Brucite Fiber Modified Asphalt Mastics
Authors: Guan Bo Wen , Chen Shuan Fa , Xiong Rui , Sheng Yan Ping , Ma Li Li
Published: May 2011

The rheological properties of brucite fiber asphalt mastics are studied by the Brookfield viscosity test in this paper. The results show that at 105°C and 120°C, brucite fiber asphalt mastics shows the characteristics of non-Newtonian fluid. At 135°C and 150°C, it shows the characteristics of Newtonian fluid gradually. When the temperature is higher than 150°C, the asphalt mastics has fully manifested the characteristics of Newtonian fluid. The viscosity increases with the increasing of the dosage of brucite fiber. The value of ZSV increases with the increasing of the dosage of brucite fiber. According to the change law of ZSV, the anti-rutting performance of asphalt mastics is improved by the addition of brucite fiber.
The Impact of Lithium Polysilicate on the Microstructure of Sand-Lime Products
Authors: Dachowski Ryszard , Owsiak Zdzislawa
Published: May 2011

The general attributes of calcium silicate products have been investigated in several studies. In this paper, we propose to use a specific modifier i.e. lithium polysilicate solution in order to examine and improve compressive strength of sand-lime bricks. The research was examined by scanning electron microscope (SEM). The main objective was to determine the phase composition in the structure of the sand-lime products.
Test of Thermal Capability to Rubber Concrete
Authors: Yang Ling Qiang , Zhang Li Wei , Gao Rui
Published: May 2011

Through a series of tests of thermal capability to rubber concrete, we get the adiabatic temperature rise curve and hydration temperature curves with different amount rubber in concrete. It revealed the relationship between amount of rubber and thermal conductivity of rubber concrete. Large rubber pieces should be used to replace coarse aggregate in protection concrete of sluice pier and bridge pier.
Influence of Nitrogen on Transformation of Vanadium Micro-Alloyed Steels
Authors: Yu Hao , Chen Bing Hua , Cheng Xing De , Zhang Kai Hua
Published: May 2011

The continuous cooling transformation (CCT) behaviors of two vanadium (V) micro-alloyed steels with different Nitrogen (N) levels were investigated under the undeformed and deformed conditions, respectively. It is found that the austenite-bainite transformation is suppressed during dynamic CCT process due to hot deformation. For V-N steel, the transformation of austenite-proeutectoid ferrite and austenite-acicular ferrite (AF) occur under a wider range of cooling rates.
Optimization Study of Expansive Agents of Shrinkage-Compensating Concrete
Authors: Ma Qin Yong , Huang Wei , Cui Peng Bo
Published: May 2011

Using 6% HCSA, HEA and CSA equivalent replacement Slag Portland Cement add into the normal concrete, the compressive strength, splitting tensile strength and flexural strength at the age of 3d, 7d and 28d are researched. It is concluded that reinforcing effect of the three expensive agents are in order CSA, HEA and HCSA form the view of mechanics , expansive agents increase the bonding force between coarse aggregate and slurry, alleviate the development speed of cracks and increase the destruction deformability of concrete.
Effect of Fly Ash and Lime Treatment on Mechanical and Swell Properties of Dunkirk Dredged Sediments
Authors: Wang Dong Xing , Zentar Rachid , Abriak Nor Edine , Xu Wei Ya
Published: May 2011

Traditional approaches such as ocean dumping and inland deposit are unsatisfactory for the management of dredged sediments, in the context of sustainable development. The solidified sediments with fly ash and lime as road base materials are preferred to conserve land and minimize impact to environment. A series of tests, such as compaction tests, tensile strength tests and swell tests, were performed to explore mechanical and swell properties of Dunkirk dredged materials. The fly ash contributes to the considerable increase in elastic modulus and the small increase in tensile strength in the presence of lime. Then the potential of treated sediments as road base material is evaluated. After immersion in water for 4 days, the addition of fly ash can induce a remarkable increase in swell percents in contrast with the lime-based sediments.
Research about the Effect of Polypropylene Fiber on Mechanical Properties of Curing Sludge
Authors: Zhan Shu Lin , Gao Shu Sen , Lai Jun Ying
Published: May 2011

In order to study the influence of modified polypropylene (PP) fiber on the physical and mechanical properties of curing sludge, the same amount of cement and different content of polypropylene fiber were mixed into the sludge. Unconfined compressive strength tests, water content tests and shear strength tests were carried out on different specimens with different curing time. The results show that the sludge curing effect is markedly improved by the addition of the polypropylene fiber. As to the curing sludge with the same curing time, when the content of the polypropylene fiber increases, the unconfined compressive strength and the cohesive strength greatly increase, and the internal frictional angle decreases.
The Influence of Admixtures on the Corrosion Protection Afforded Steel Reinforcement in Seawater-and-Seasand Concrete
Authors: Zhou Jun Long , Ou Zhong Wen , Chen Qiao , Chen Yun
Published: May 2011

It is inevitable for steel reinforcement to be corroded when mixed with seawater-and-seasand concrete. In order to improve steel corrosion protection properties of seawater-and-seasand concrete, reduce the chloride ion’s attack on steel reinforcement in structural concrete and lengthen the steel reinforcement’s service time, this paper presents an experimental study on whether admixtures like fly ash, slag and metakaolin in the seawater-and-seasand could retard the corrosion to steel reinforcement and provide protection to steel reinforcement in seawater-and-seasand concrete. The results indicated that metakaolin had a significant anti-corrosion effect and greatly enhanced the steel corrosion protection properties of seawater-and-seasand concrete whereas both fly ash and slag did not appear to have any obvious influence on curbing the corrosion of steel reinforcement.
Research on Contributing Factors of Gypsum-Based Composite Material Performance
Authors: Ai Yong Ping , Liu Li Jun , Zeng Ying Ying , Zhou Tai Ping
Published: May 2011

The rules of various factors influence the gypsum-based composite material(GBCM) performance are studied, using orthogonal experiment from the material components, retarder dosages and different w/c ratio. The results show that the strength and softness coefficient of GBCM are obviously higher than that of pure gypsum. The Portland cement can markedly accelerate the coagulation of GBCM, when its mixed amount is 10%-15%, it can enhance the strength and softness coefficient of GBCM, but overdosage will cause fall of the strength and softness coefficient of GBCM. The phosphate retarder changes the growth habit of dehydrate gypsum crystal and the aperture distribution of GBCM, which correspondingly makes the crystal thickening and the pore structure deteriorating and ultimately leads to reduce the strength
A Study of the Mixing Ratio and Mechanical Properties of Clay-Carbide Slag-Fly Ash Unfired Brick
Authors: Hu Wei Xin
Published: May 2011

A new environment-friendly wall material- the unfired brick is produced by using clay, carbide slag, fly ash and cement as the main raw materials，and certain amount of chemical excitator. The primary mixing ratio is designed on the basis of its mechanical properties and durability. When adopting water curing under normal temperature and atmosphere pressure，the compressive strength，flexural strength and frost resistance of the unfired brick are measured. The results reveal that the optimum mixing ratio for unfired brick is: Carbide slag 30%，fly ash 30%，cement 25% and clay 15%. For the unfired brick formed by vibration with the optimum mixing ratio，the min. compressive strength of each brick is more than 10 MPa, the overall properties meet the requirement as specified in standard JC 239—2001“Fly Ash Brick”.
Experimental Study on Aerated Concrete Produced by Iron Tailings
Authors: Tian Yu Ze
Published: May 2011

The non-autoclaved aerated concrete block with greater than 7.5Mpa compressive strength is produced by using iron tailings, lime, aluminum powder, caustic alkali, water, cement and gypsum in the laboratory after the experimental study on the property of iron tailings produced by Anshan Iron and Steel Group. The optimal mix proportion is finally determined by adopting orthogonal experimental method, the evaluating indicator is compressive strength. Aerated concrete block that is made from iron tailing is trial produced according to the national standards, and then its strength is determined by sample examination.
Research on Influences of Activity Mineral Admixture on Workability and Mechanical Properties of High Strength Lightweight Aggregate Concrete
Authors: Dong Xiang , Gao Jian Ming , Hu Ai Yu
Published: May 2011

Aiming at the high expense of high strength lightweight aggregate concrete (HSLWAC), low-cost HSLWAC was produced making use of the industrial wastes including fly-ash (FA) and ground granulated blast furnace slag (GGBS) as admixture, and the influences of these admixtures on the workability and mechanical properties of HSLWAC were studies. Result shows that HSLWAC whose cubic compressive strength is high to 70MPa at the age of 28d can be produced with mixing admixtures; the effect of mixing GGBS to the strength of HSLWAC is better than that of mixing FA; and mixing admixtures is useful for the improvement of the workability of HSLWAC; However, the brittleness of HSLWAC rises with the increase of its strength.
Utilization of Ground Granulated Blast-Furnace Slag Seed Crystal in Eco-Cement
Authors: Ai Hong Mei , Wei Jing , Bai Jun Ying , Lu Pu Guang
Published: May 2011

Eco-cement produced from waste concrete was proved to be feasible in early research. The seed crystal of ground granulated blast furnace slag (GGBS) was utilized in this research to lower the sintering temperature of eco-cement clinker. The mineral compositions of clinker with GGBS seed crystal was analyzed by X-ray diffraction (XRD), and the mechanical properties of eco-cement with GGBS seed crystal was also tested. Four main cement minerals were all observed in eco-cement clinker and the compressive strength of the eco-cement pastes can approach to about 66 MPa at 28 curing days. The results showed that GGBS seed crystal was favourable for the formation of cement minerals at a lower temperature. It can help reduce by about 50~100°C for the sintering process of cement clinker. Content of GGBS seed crystal should better be in the rage of 5%~8%, and the suitable sintering temperature should be 1350°C.
Experimental Study on Application Properties of Macroporous Ecological Concrete without Sand
Authors: Xing Zhen Xian , Xing Yi
Published: May 2011

This paper suggests that deposition paste area is one of those leading control indicators of mix proportion design for the macroporous ecological concrete without sand. By analyzing the effect of water-cement ratio, amount of cement, and type of coarse aggregates on application properties of concrete, it puts forward that when carrying out the mix proportion design of the concrete, setting the water-cement ratio as 0.4 can help the macroporous ecological concrete without sand acquire satisfying application properties. Based on this idea, experiments to the later period strengths and the erosion resistance property of concretes are tried out. Finally, the result of this series of experiments shows that the macroporous ecological concrete without sand possesses necessary conditions for plants to survive and grow up.