bluuebunny/crossref_metadata_2025 huggingface dataset:
Relationship of Plasticity Index of Soil with Laboratory and Field Electrical Resistivity Values
Authors: Osman Syed Baharom Syed , Siddiqui Fahad Irfan , Behan Mohammad Yaakob
Published: August 2013

Borehole sampling and laboratory soil characterizations provide accurate engineering properties, yet it is time-consuming and expensive. Geo-electrical survey is an attractive tool for delineating subsurface properties without soil disturbance. The primary objective of the current research work is to investigate the relationship between electrical resistivity and plasticity index of soil. The results from electrical resistivity tests (field and laboratory) and Atterburg limit tests were analyzed to understand the relationship between electrical resistivity and plasticity index of soil. Plasticity index have a significant correlation with field and laboratory electrical resistivity values for all soil samples. It was found that silty sand soil samples are characterized by higher plasticity index and lower resistivity values whereas sandy soil samples have lower plasticity index and higher resistivity values.
An Analysis of the Influence of the Temperature on the Capillary Migration of the Residual Soil
Authors: Que Yun , Chen Jia
Published: August 2013

Taking the granite residual soil of Fujian Province as an example, this paper investigated the humidity migration law of the granite residual soil pillar embankment under the co-influence of temperature and capillary based on the finite difference technology. The results show that the temperature and humidity of the surface of the soil pillar take on the linear downward trend under different temperature gradients, and the larger the temperature gradient is, the wider the falling range will be. The temperature and humidity migration volume of the hot end of the soil pillar presents the linear variation along with the increase of the average temperature. The change of the temperature field of the residual soil pillar is mainly influenced by the temperature gradient. The humidity migration volume and the rising height of the capillary water are obviously more strongly influenced by the average temperature than the temperature gradient. Therefore, it is necessary to study the influence of the temperature-humidity coupling on humidity migration for the low embankment of the high underground water level in the hot-humid area.
Research of an Slope under Rainfall and Deep Excavation Condition with UDEC
Authors: Ren Li Xuan , Kai Ning
Published: August 2013

The landslides often due to the rainfall and the excavation inside. Although both of them could influenced the stability of the slope, in the different combination of the condition of rainfall and excavation. The results would make a big difference from condition. The analysis results of Finite Element Method have a large difference with the actual situation, especially in the large deformation and landslide. Therefore, we use the Distinct Element Method to simulate and analysis the collapse of Zengziya in Chongqing. We collect different parameters to simulate the changed conditions of the combination of rainfall, half excavation and whole excavation. Then we will get the data of displacement of the rock and the stress redistribution of the slope. By the analysis of the those data, and the comparison from the field situation, we will draw a conclusion that the main factors of the landslides is the rainfall, and the excavation sometimes can simulate the landslides. At last, our research results can make some help of the practical engineering.
Displacement Prediction of Rock Slope on Genetic Neural Network
Authors: Zhang Zhi Qiang , Zhang Guo Jian
Published: August 2013

Displacement and its grow are critical to the stability of rock slope, in this thesis, by applying Genetic Neural Network to modeling the data obtained by monitoring, the patterns and trends of slope deformation are analyzed and predicted, and therefore supply the reliable basis for slope management.
Soil-Water Characteristic Curve for Unsaturated Mixed-Soil Considering Physical Form and Dry Density Effect
Authors: Cui Kai , Huang Hui
Published: August 2013

A test is conducted to get the soil-water characteristic curve for three typical composite unsaturated soils in west Sichuan, considering its physical composition, physical form and dry density. Test data shows that the variation of physical composition, particle size and dry density can result in great change of soil-water characteristic curve. The bigger the dry density is and the more hydrophilic mineral it has, the more gently the soil-water characteristic curve is, and the higher dry density soil sample has higher residual moisture content. In addition, matrix suction decreased with less clay content and more content under the same water content. For three typical composite unsaturated soils, the change of soil-water characteristic curve resulting from variation of dry density is less in bigger water content, and is more in lower water content.
The Modified Cam-Clay Model and the Constitutive Relation Principle of Thermodynamics with Internal Variables
Authors: Chen Jing Yu , Hai Ying
Published: August 2013

According the theory of thermodynamics with internal variables, the relation between yield function and dissipation function and the condition of associated flow rule in stress space are presented; the elastoplastic matrix of the incremental form of the material constitutive equation is given out, this matrix is determined by the free energy function and the yield function. The Gibbs free energy function of solid phase of saturated soils subjected triaxial compression stress state is presented, and using the constitutive theory of thermodynamics with internal variables, yield function and stress-strain relation of the modified Cam-Clay model is obtained by the free energy function and the dissipation function. These results prove the correctness and feasibility for this constitutive theory to construct elastoplastic constitutive relation of saturated soils.
The Numerical Simulation of Effect of Parameters for Bolts on Slope Stability
Authors: Li Tao , Zeng Ling , Guo Fang
Published: August 2013

In order to analyze the influence of bolt supporting parameters on the stability of slope, based on the limit equilibrium method to establish model of slope and calculated the safety factor of slope. Research shows that: (1) As the bolt length increases, the safety factor of slope increases gradually, then the length of anchor bolt can be used as the design length when the safety factor can meet the standard requirement.(2) With the increase of the anchor Angle, the safety factor of slope present the trend of first increasing and then decreasing, when bolt spacing increased to a certain value, the safety factor of slope reduce significantly.(3)In this paper, the analysis method of slope bolting parameters on its effect to the stability is simple and strong operational, which can provide a reference for related engineering personnel.
Highway Subgrade Dynamic Response Model Test Study on Foundation-Broaden Dynamic Compaction Consolidation
Authors: Pan Xiang Hong , Yao Zhan Yong , Zhang Kai , Jin Zhuang
Published: August 2013

While widen the highway foundation, due to it is still unclear that the law of dynamic compaction vibration impact on the original subgrade and foundation structure , which restricts the use of dynamic compaction technology in the highway foundation-broaden project. In this paper, by using the dynamic compaction indoor model test, simulated the dynamic compaction road widening foundation works, monitored the vibration acceleration of the pavement and subgrade surface in the process of dynamic compaction vibration, analyzed the dynamic compaction vibration propagation law of the roadside foundation in the subgrade structure. At the same time, we made the vibration amplitude of the key points and the rammer subsoil dynamic pressure value as double assessment indicators. Besides, we analyzed the dynamic compaction vibration response of subgrade under different parameters, evaluated foundation reinforcement effect. With research, under the same tamping energy and in a certain range of rammer diameter and weight, we had better choose small radius rammer and the compaction process of heavier rammers dropping from lower point, which can reduce the foundation dynamic vibration of the old subgrade and ensure foundation reinforcement effect.
Geotechnical Centrifuge Modeling of Super-High Embankment Filled by Red Soft Soil in Western Yunnan Province
Authors: Wu Guo Xiong , Zhang Ke , Chen Xiang Shou
Published: August 2013

High and even super-high embankment filled by red soft soil are often used in road construction in the mountainous areas of Western Yunnan province, China. Due to the poor engineering properties of the red soil, a proper analysis of the stability of the embankment is necessary. This paper aims to analyze the deformation and stability of a typical super-high embankment by comparing the geotechnical centrifuge modeling and FLAC-2D results. The paper finally concludes that: 1) The red soft soil in Yunnan province can be used as fill material; 2) Flat slope and geo-grid can effectively restrain the deformation of the slope; 3) Geotechnical centrifuge modeling well reflect the real engineering performance of the embankment.
Performance of Abutment with Geocell Reinforced Cement Soil Backfill
Authors: Song Wen Ming , Wang Yi Min , Chen Ye Kai
Published: August 2013

Unconfined compressive strength tests of soil with different cement dosage of stabilization have been conducted to determine the optimum cement stabilizing dosage. And, the shear strength and deformation of the geocell reinforced cement soil have been investigated through a serial of direct shear tests and plate-loading tests. The results show that there is a significant improvement on shear strength and modulus of the soil by reinforcement. Moreover, FEM has been used to simulate and analyze the performance of abutment with geocell reinforced cement soil backfill. And the comparison of the computing results to field testing results has been carried out. The research results indicate that: the abutment with wedge-shape geocell reinforced cement soil backfill has remarkable effect on decreasing the differential settlement on bridge-embankment transition section. The gradient of settlement along the longitudinal direction of bridge-embankment gets much more smooth-going and less.
Experimental Study on the Effect of Joint Spacing on Fragmentation Modes and Penetration Rate under TBM Disc Cutters
Authors: Ma Hong Su , Yin Li Jun , Gong Qiu Ming , Wang Ju
Published: August 2013

Joint spacing is one of the significant factors affecting the rock fragmentation by TBM cutters. Based on laboratory test, the effect of joint spacing on the fragmentation modes and penetration under TBM disc cutters is studied. In the test, two kinds of concrete with different strengths are adopted to simulate rock sample. The joint spacing varies from 50mm, 80mm, 200mm and the intact samples are also tested for comparison. Firstly, four kinds of fragmentation modes for single-set jointed rock are found: (1) the crack initiates from the joint plane and propagates to free surface, to form fragmentation chipping. (2) The side crack and median crack initiate beneath the crushed zone and propagate to joint plane to produce chipping. (3) In the rock block indirectly indented by cutter, the crack initiates from the joint plane and propagates to adjacent joint plane to produce chipping. (4) Normal fragmentation mode. Basically, the first two kinds are generally for jointed rock, while the other two kinds are respectively for the jointed rock with small and large joint spacing. Secondly, from the viewpoint of the fragmentation modes, the effect of joint spacing on tunnel face stability is investigated and then compared with field data of Jinping II Hydropower Station. Finally, it is shown that highest penetration rate can be achieved with the joint spacing of 50-80mm, and moreover, joint spacing gives more notable effect on fragmentation of the rock with higher strength.
Upper Bound Limit Analysis of Passive Earth Pressure of Cohesive Backfill on Retaining Wall
Authors: Liu Xin Rong , Ou Ming Xi , Yang Xin
Published: August 2013

In view of the shortage of using classical earth pressure theories to calculating passive earth pressure of cohesive soil on retaining wall under complex conditions. Based on the planar slip surface and the back of retaining wall was inclined and rough assumption, the calculation model of passive earth pressure of cohesive backfill under uniformly distrubuted loads was presented, in which the upper bound limit analysis was adopted. Meanwhile it was proven that the prevailing classical Rankine’s earth pressure theory was a special example simlified under the condition of its assumptions. For it’s difficult to determine the angle of slip surface , a relatively simple method for calculating the angle was proposed by example. And the influence of angle of wall back , friction angle of the interface between soil and retaining wall, cohesion force and internal friction angle of backfill soil to planar sliding surface and passive earth pressure were analyzed. Some good calculation results were achieved, these analysis can provide useful reference for the design of retaining wall.
On Energy Strength Theories for Geomaterials
Authors: Xue Shou Yi
Published: August 2013

The composition of the energy in the process of material deformation and failure and the relationship between energy and strength were summarized; the features, essences and main problems of the energy release rate theory, the three-shear energy theory and the net shear strain energy density theory were illustrated. It is pointed out that the roles of distortion strain energy, volumetric strain energy and dissipated energy are not identical, especially distortion strain energy and volumetric strain energy must be separately processed. The three-shear energy theory and the net shear strain energy density theory can properly deal with the problems, and also well reflect the intermediate principal stress effect. The above research results can provide references for further discussions.
Deformation and Failure Characteristics of Embankment upon the Slope in Permafrost Area under Different Foundation Slope
Authors: Su Qian , Huang Jun Jie , Liu Bao , Li Yu Jie
Published: August 2013

To investigate the effect of foundation slope on stability of embankment upon the slope in permafrost area, 3 groups of model tests with different foundation slope are designed using the mechanical similarity based on geotechnical centrifuge modeling, when the freezing-thawing depth of the embankment reaches the greatest. The results show that: (1) The foundation slope has effect on the stability of the embankment. The deformation mainly concentrates on the soil layers above the freezing-thawing interface, and the deformation mutation point takes place at the freezing-thawing interface. (2) According to fracture characteristics and failure severity of the embankment, failure modes can be divided into the cracking failure in shallow layer and in deep layer. (3) The cause of unstable failure is the deficiency of shear resistance strength of the weak belt, the soil layers above the freezing-thawing interface slips along the freezing-thawing interface under gravity load. (4) Under the experimental conditions, the critical value of the foundation slope influencing on the stability of the embankment is about 1:6 when the height of the slope embankment is 5.0 m.
Research on Geogrid Strain of Reinforced Earth Retaining Wall by Numerical Simulation
Authors: Wang Ji Cheng , Liu Ai , Yan Chuan Fa
Published: August 2013

Numerical simulation was used to study the relationship between reinforced earth retaining wall gradient and geogrid strain. Research results show that when the load on the wall top is small, the function of geogrids in the upper section of retaining wall is not brought to full play, the angle between potential rupture surface and horizontal plane is small and resembles Rankines active soil pressure rupture surface, and it is far from wall face. When the load on wall top increases, potential rupture surface becomes steep, the distance between the surface and wall face is about one third of wall height. Inclined wall face also displays this property. The gentler the reinforced earth retaining wall gradient is, the smaller the geogrid stress is, and the safer the wall is. However, when gradient drops below 1:0.4, safety increase becomes vague. When wall gradient is 1:0.3, geogrid stress is most uniformly distributed, and thus has the highest use efficiency and the wall is the most cost-effective.
Numerical Study on Dam-Foundation-Dam Interaction
Authors: Zhong Hong , Li Hong Jun
Published: August 2013

As dams approach the end of their design life periods, retrofitting of dams is needed in many cases. For the retrofitting procedure of building a new dam close to the existing old dam without demolishing it, the interaction between the two dams and the unbounded foundation is an important issue to be investigated. The influence of the existing dam on the dynamic response of the newly built dam is examined. Two systems are analyzed, i.e., the new dam-foundation system and the dam-foundation-dam system. For the two systems, modal analysis and time history analysis using the viscous-spring artificial boundary are performed. It’s found that there’re much more vibration frequencies for the dam-foundation-dam system as compared to the new dam-foundation system within the same frequency range. The existence of the old dam also induces one more peak and a wider plateau in the response spectrum of the acceleration time history of the dam crest. However, the maximum stress distribution is not influenced much by the old dam.
Stability Analysis of Unsaturated Soil Slopes Based on Unified Strength Theory
Authors: Li Yan , Zhao Jun Hai , Zhu Qian , Zhang Chang Guang , Bai Wen Qi , Xu Jian Feng
Published: August 2013

Based on the unified solution of shear strength in terms of double stress state variables for unsaturated soils, the unified formula of stability coefficient for unsaturated soil slopes under the plane strain condition is derived by Sweden slice method, which considers the effect of the intermediate principal stress rationally. Combining with engineering example, the proposed formula is compared with the one that is on the basis of Fredlund unsaturated soil theory and the influencing characteristics of factors including intermediate principal stress, matric suction, effective internal friction angle and matric suction angle is obtained. The research result indicates that: intermediate principal stress and matric suction have obvious impacts on the stability coefficient for unsaturated soil slopes; the stability coefficient has been increasing with the increase of unified strength theory parameter and matric suction, which proves that the consideration of intermediate principal stress and matric suction can make slopes give full play to their self-stabilities and strength potential, and the yield criterion has great impact on the judgment of slope stability; the stability coefficient also increases nonlinearly with the increase of effective internal friction angle and matric suction angle. The proposed unified formula of stability coefficient for unsaturated soil slopes enjoys a wider application. The stability coefficient for unsaturated soil slopes according to the Fredlund unsaturated soil theory and that for saturated soil slopes are just the special cases. The research result can provide theoretical basis for stability analysis and reinforce design of the unsaturated soil slopes, and it is of great significance to the slope management.
The Numerical Analysis of Stability against Upheaval of Foundation Pit
Authors: Liu Guo Feng , Liang Ren Wang
Published: August 2013

Great region discrepancy exists in natural soil, while analysis and calculation of stability against upheaval of foundation pit in current specifications is only to soft soil. In order to study the stability against upheaval of foundation pit bottom in different geological conditions, FLAC3D numerical analyzing software is adopted to calculate and visualize the influence that several factors cause to stability safety coefficient, and contrast and checking is also made with current analysis and calculation methods and normal formula of stability against upheaval of excavation. The study shows that : a increase in soil’s cohesion,internal frication angle and embedded depth can develop the stability against upheaval of foundation pit.
Analysis on FLAC Large Deformation Mode of Rock Mass due to Transform from Open-Pit to Underground Mining
Authors: Chang Lai Shan , Li Xin , Zhang Rui Peng , Chen Ya Nan
Published: August 2013

According to the problem of rock slope deformation, fracture and stability during the transform from open-pit to underground mining at Yanqianshan Iron Mine, using FLAC large deformation mode to analysis mine excavation characteristics about deformation and damage of open-pit slope in different depth. Excavation simulation displays that the softrock of north slope easily to backfall heavily, But unusually form rapid sliding, the influence to underground mining is small, but large number of small crushed stones fill the rock layer, that is unfavorable to control the dilution and loss index. South slope hardrock mass have not appeared large deformation and unitary sliding during primary mining.
Applications of Soil Nailed Wall in Foundation Pit Support
Authors: Zhang Chun Mei
Published: August 2013

Deep foundation pit support technology has widely affected the world, and well mainly talk about its application as a soil nailed wall in the engineering of underground garage foundation pit. Different ways of support were applied in different conditions to design construction examples, and then solutions of foundation pit support constructions were raised. So the engineering designing method has been proved correct and feasible.
Static Loading Test of the End-Bearing Pile under the Sides Friction Action
Authors: Wang Xiao Wei , Yi Nan Gai , Zhang Shi Ping
Published: August 2013

Because the pile foundation has the characters of high bearing capacity, small deformation and easy to construct, it is widely used in practical engineering. In order to verify the end-bearing pile loading capability, in this paper, the single pile vertical compressive static load test is used to the on-site measuring point in actual engineering test, and get the Q-S curve of the pile. FEM is used to simulate the test at the same time. The ideal elastic-plastic constitutive model based on Mohr-Coulomb failure criteria is used to simulate foundation soil. Some conclusions are obtained by using large scaled finite element analysis software ADINA to build the 2D plane strain finite element model and to proceed numerical analysis of the pile. Finally, the comparative analysis with the engineering practice is proceeded. It has the practical significance for the structure analysis of the single pile.
Development of High Volume Fly Ash Concrete (HVFAC) in Czech Republic
Authors: Kratochvile Lucie , Sachova Hana , Kolisko Jiří
Published: August 2013

Article discusses the use of fly ash in concrete production. It is focused on the chemical and physical properties of fly ash and in particular the mechanical properties of mortar, where ash was added in amounts of 10% to 70% by weight of cement. Furthermore, the mechanical properties of the samples compared to the same dose of mixing water and samples that have the same consistency of fresh mortar, different batch mixing water.
Mechanical Property of Brucite Fiber Reinforced Composite Material
Authors: Guan Bo Wen , Chen Shuan Fa , Liu Kai Ping
Published: August 2013

In this paper, microstructure of brucite fiber was introduced briefly and its physical and chemical properties were given. Disperse method of fiber applied in concrete has been introduced. The effect of compressive strength, flexural strength of concrete and cement mortar by the addition of brucite fiber have also been discussed. The mechanism that fiber can reinforce concrete has been discussed. The results showed that the diameter of brucite fiber changes from micrometer scales to nanometer dimension with the dispersing action of water reducers. Brucite fiber can exert its high tensile strength on concrete and improve the mechanical property of cement motar and concrete. Life of bructie fiber reinforced composite material can be prolonged by the addition of brucite fiber.
Development of High Performance Concrete Containing Admixture in Nuclear Power Plants
Authors: Kim Jeong Eun , Park Wan Shin , Yun Song Hui , Kim Do Gyeum , Noh Jea Myoung
Published: August 2013

This paper presents the results of an experimental study on the compressive strength, splitting tensile strength and modulus of elasticity characteristics of high performance concrete. These tests were carried out to evaluate the mechanical properties of HPC for up to 7 and 28 days. Mixtures were prepared with water to binder ratio of 0.40. Two mixtures were containing fly ash at 25%, silica fume at 5% cement replacement, respectively. Another mixture was contains blast furnace slag and fly ash at 25%. Three standard 100¥a200 cylinder specimens were prepared. HPC showed improvement in the compressive strength and splitting tensile strength when ordinary Portland cement was replaced with silica fume. Compare with specimens FA25 and BS25FA25, specimen SF5 showed much more modulus of elasticity. It shows that the use of the blast furnace slag of 25% and fly ash of 25% cement replacement has caused a small increase in compressive strength and splitting tensile strength and modulus of elasticity compared to the only use of fly ash of 25% at 28days. The results indicated that the use of blast furnace slag or silica fume provided the good performance compare to fly ash when the mechanical properties of the high performance concretes were taken into account.
General Introduction of the Performance of Sprayed FRPC
Authors: Sun Cheng Fang , Gu Qian
Published: August 2013

The spayed fiber reinforcement polymer concrete (FRPC) is a kind of new composite material and construction methods, combining good characteristics of the spayed concrete with FRPC. The research and application in China and overseas of the RFPC technology are briefly introduced. The study in China mainly focuses on the physical and mechanical performance and application style, both the theory and application of which are relatively mature. The spayed FRPC widely applied into civil engineering, water project, buildings, road and bridge, and repairing and strengthening various contractures, which obtained engineering success and economic benefit.
Numerical Simulation Analysis of Hole Shape Design of Self-Thermal Insulation Perforated Brick
Authors: Feng Xiao Ping , Yu Yong Fu , Jiang Bo , Bai Wei
Published: August 2013

The hole shape design of perforated brick directly affects thermal insulation performance of wall. In order to study the influence of shape, size and configuration of perforated brick on the insulation performance, six kinds of perforated brick with different hole shape were designed, and their temperature field were simulated with finite element method. The results show that the insulation performance of perforated brick with square hole is the best. Filling brick holes with thermal insulation materials can improve the insulation performance of perforated brick, Besides; The thermal conductivity of perforated brick affects its thermal resistance, so brick materials with low thermal conductivity should be developed for the achievement of energy-saving standard of wall thermal resistance.
Summary of Application of Intelligent Materials in Building
Authors: Sun En Yu , Bi Wan Li
Published: August 2013

Intelligent material is a kind of multifunctional composite bionic design, can sense environmental conditions, through the sensor network, interest will be provided to the control system, to respond to take action. Self-diagnosis and through self-growth, in situ composite regeneration mechanism of system failure, repair some local damage or destroy; to the changing external environment and conditions, timely adjust its structure and function. Because of its relative to the performance of traditional materials with special excellent, with broad prospects for development.
Anti-Permeability and Resistance Carbonization Test Study High Performance Concrete with High Content of Fly Ash
Authors: Guo Xiao Yan , Hao Run Xia
Published: August 2013

Anti-penetrability performance test and carbonization test of high performance concrete with high volume fly ash were done and were compared with normal concrete. Test illustrated that filled the concrete dense function of high quality fly ash were superior to common concrete. Average carbonation depth of high quality fly ash concrete was slight inferior to carbonation depth of the common concrete. Keywords: anti-penetrability performance; fly ash; high performance concrete; carbonation
Flexural Toughness of Hybrid Fiber Reinforced High-Performance Concrete under Three-Point Bending
Authors: Xia Dong Tao , Liu Xiang Kun , Zhou Bo Ru
Published: August 2013

A set of new hybrid fiber reinforced high-performance concrete was developed and studied by experiment. The fibers incorporated the concrete are the collection of the steel fiber, modified polypropylene fiber and polypropylene with total fiber content not more than 1%. And the compressive test, splitting tensile test and the flexural toughness test were performed on eight groups of specimens. Based on the load-deflection and load-CMOD curves and the equivalent flexural tensile strength, the effect of fiber volume fraction and hybrid mode upon concrete's mechanical properties and post-peak behavior were investigated. The test results show that the mixing of the three different fibers can increase concrete's splitting tensile strength and flexural toughness more effectively with no significantly effect on compressive strength. The mixture of the three different fibers exist the optimization problem. Based on the results of the analysis, the compatible proportion of the three fibers is 0.7% steel fiber, 0.19% modified polypropylene fiber and 0.11% polypropylene fiber.
Synthesis and Performance of Polycarboxylate Superplasticizers with Hydrophobic Side Chains
Authors: Wang Li Ya , Wang Yong Wei , Gao Gui Bo , Chu Ze Peng , Liu Yong Sheng , Wang Kai Yu , Zhou Xiang Zhu
Published: August 2013

Based on polycarboxylate chemistry, polycarboxylate superplasticizers (PCs) with hydrophobic side chains were synthesized through radical copolymerization reaction. The molecular weight and polydispersity index were analyzed by gel permeation chromatograph (GPC), and the results showed the same structural information. The performances of PCs in cement paste were tested by measuring the fluidity and fluidity retention. The slump and the compressive strengths of concrete were also determined. Additionally, the foaming behavior of PCs was investigated by the foam volume, the surface tension of PCs aqueous solution,and the air content of concrete. According to the data, the hydrophobic side chains of PCs may affect the hydration reaction of cement resulting in better workability.
Characteristics of Pore Structure of Free-Steaming Foamed Concrete and its Influence on the Compression Strength
Authors: Luo Yun Feng , Yu Qi Jun , Wei Jiang Xiong , Hu Jie , Li Fang Xian
Published: August 2013

s: The pore structure theories model of free-steaming foamed concrete has been established by observing its pore microstructure and morphology with SEM,and the characteristics of the pore structure has been discussed in this paper . According to the difference among its actual strength and theory strength, associated with observation of the morphology and structure of the hydration production of free-steaming foamed concrete with SEM, the influence of pore structure on the strength has been analyzed in this paper.
Mixture Ratio Design of Inorganic Polymer Concrete and the Study of Expansive Performance
Authors: Yu Li Ming , Lu Zhe An , Yuan Xiao Hui , Chen Hui Guo
Published: August 2013

norganic polymer concrete of a new environment-friendly material has been the hot issue in engineering research so far. For this new material, the main job of the paper includes: we design mixture ratios of inorganic polymer concrete by ourselves, testing the concrete in the age periods of 3, 7, 28 d. The results indicate that this kind of material strength develops mainly in the first 3 d, the strength grows slowly in the later stage; the dry shrinkage of the configured concrete properties are measured, the curve of dry shrinkage shows that the dry shrinkage occurs mainly in the first 14 d and develops slowly in the late; And measure the expansion performance of the concrete member mixed the different categories expansive agent, the results show that the volume growth of mortar specimens to join HCSA expansion agent are obvious; Test results provide a certain basis for the inorganic polymer concrete of micro expansion.
Structure Force System and Form Combination of Long-Span Structure Building to Lightening Design
Authors: Dong Yu , Shi Li Gang
Published: August 2013

The structure form lightening is an inevitable trend on development of long-span building structure dimension. At the same time, the development of structure mechanics, materials science and component processing technology progress also becomes the important boost of promotion to structure regulation-controlling ability. This article draw a conclusion that, under the specific condition, structure form's change in fact is a materialized presents of forces system combination-changing through the dual overall analysis on classification of structural unit's stress and nature classification's of structure materials, in meanwhile according to the tension members` equivalent replacement principle between rigidity and flexibility components. It may provide new enlightenment and the feasibility method for form innovation of long-span architecture design through this particular instrumentality of transformation rule.
The Study for Concrete Frost Resistance Durability under the Action of Multiple Factors
Authors: Tian Jin Liang , Yu Hongfa , Niu Jian Gang
Published: August 2013

The crack under the action of non-load was the most significant factor to affect the concrete frost resistance durability. The Orthogonal Experimental Design (OED) Method was used in this paper to optimize the match ratio of the additive and to increase the concrete frost resistance durability by adding the PF, the FA, the WA in the concrete and replacing the cement of ordinary silicate with the compound cement. It offers the reference value to the development of the hydraulic concrete.
Study on the Factors of Influence on the Production Process of Coal Gangue Sintered Brick
Authors: Liu Jia Di
Published: August 2013

For coal gangue sintered brick production process, the effect factors are discussed, the best process factors are: coal gangue maximum size should be less than 3 mm, suitable for calorific value for 400 ~ 600 kcal/kg; Forming water is not more than 17%, extrusion pressure is not more than 3.0 MPa; Dry air brick moisture content should be less than 6%; Firing temperature should be controlled in more than 1050 °C.
Research on Composite Strengthening Nano-Technique of Recycled Aggregate
Authors: Meng Rui Tan , Meng Tao , Huang Miao Zhou , Xu Qing Lei
Published: August 2013

The work described in this document forces on composite strengthening technique of recycled aggregate. In this experiment, recycled aggregates are soaked in different types and different concentrations of nanomaterials to strengthen. This research estimates the strengthening effects by comparing the properties of recycled aggregate soaked in different materials, and proves that the composite proportioning has better effect.
Research on the Spatial Construction Strategy of Traditional Settlements for the Tujia Nationality
Authors: Zheng Hai Chen , Chen Cheng Qin , Tang Lei , He Yong Qiang
Published: August 2013

The River Bend region of Hou’xi town in Chongqing Municipality is one of the Tujia neighborhoods; the spatial construction of the whole village has been made to face a crisis due to lack of basic research on the traditional settlement space and the interests driven in recent years. The reasons for the disorder and lack of the charm of the new settlement space were analyzed, and the construction policies of traditional settlements were combed based on field research from the perspective of Architecture and Landscape Architecture by the methods of combining quantitative and qualitative. The conclusion shows that the village building should respect and protect their traditional styles; the problems what the current village construction face are solved through the integration of the layout of public resources, the improvement of the traffic situation, the construction of the unique style and the transformation of the refinement.
Preparation and Performance of Photosensitive Epoxy Acrylate Modified by N-[(4-Bromo-3,5-Difluoro) Phenyl]acrylamide
Authors: Yao Xin Ding , Fang Rui Na , Pang Hong Jian , Cui Peng , Liu Guo Ji
Published: August 2013

After the 4-bromo-3,5-difluorophenyl acrylamide (BDPA) and acrylic acid were introduced into the epoxy acrylate (EA), the photosensitive epoxy acrylate (EFBDPA) with good performance was prepared through chemical graft modification. The structure of EFBDPA was confirmed by FTIR and 1H-NMR. When the content of BDPA in EFBDPA was 20%, the cured coating of EFBDPA had better performance than the unmodified EA cured coating, its tensile strength, 80 % decomposition temperatures and the residual carbon ratio were improved 86%, 5.7 °C and 4.2 %, respectively.
Research on the Effect of Beads on Properties and Microstructure of Cementing Materials
Authors: Yang Wen , Feng Nai Qian , Bee Ch’ng Guan , Liu Xiao Qin
Published: August 2013

The paper studied the effects of different contents of beads on powder pressure entity dense packing density, mechanical performance of composite cement paste. The microstructure of the composite paste is researched by SEM analysis and nitrogen adsorption method. The results show that when the beads content is low, the compacting voidage decreases with the increased bead contents. When the beads content is 30%, composite cementing material achieves the densest packing density. The compacting voidage of composite cement powder has strong correlation with the pore structure and strength of hardened cement paste. When the compacting voidage value reaches minimum, the average pore radius and maximum pore radius of hardened cement paste reach the minimum values. In addition, the 28d strength of composite cement paste is higher than ordinary cement paste.
An Experiment for Effects of Different Additives on Strength of Sediment Solidification
Authors: Chen Guan Huan , Zhu Jian Zhong
Published: August 2013

The solidification method is a significant and resultful method for the disposal of dredged sediment. Solidified agents can be employed to improve the unconfined compressive strength (UCS) of sediment solidification. In this work, considering of economy and practicability, three kinds of optimized compound additives are selected and investigated on the effects of UCS of sediment solidification. 7d., 14d.and 28d. solidification stadium were taken to test the UCS of samples. Results showed that the activator had the best effect on increasing the UCS. The comparative tests also indicated that adding any kind of additive into the cement-based materials could improve the UCS of sediment solidification, the highest value of UCS was 11.02MPa (SCAHR). By means of scan electron microscope (SEM) technology, the microstructure images of the raw sample and solidified sample were obtained, which help to understand the development of UCS of the solidified sediments.
Research on the Preparation of Wood-Based Composite Materials Using Wood Processing Residues
Authors: Li Xiu Rong , Li De Hua , Jiang Er De , Fu Yun Lin , Lai Lian , Ning Xian Jie
Published: August 2013

Cellulose is one of the most abundant renewable resources on the earth and could meet the increasing demand for environmental protection property and biocompatibility of materials. In recent years, ionic liquid, as a new type of environmentally-friendly medium and soft functional material, has gained widespread concern, for it has provided broad space for the further development of cellulose chemistry. This paper selects 1 - propenyl-3 - methylimidazolium ionic liquid to dissolve and reproduce the cellulose, thereby preparing the gel-type wood-based composite. The reformed fiber bundles constitute an unclosed three-dimensional cross-linked network as the support frame which owns the microstructure similar to balsa wood as well as the stable chemical and physical properties. Its oven dry density is 0.221 g/cm3 and the porosity is over 87%. This kind of gel-type wood-based composite prepared by the green chemical processing could fix and store the carbon adsorbed by trees, which is conductive for the environmental protection.
Relations between Concrete Structural Parameters and Abrasion Resistance
Authors: Makarova Natalya V.
Published: August 2013

The concrete surfaces after abrasion wear test have been characterized by structural parameters, such as mean inter-particle distance; mean coast aggregates diameter, its area fraction, and matrix hardness. The specific method to obtain the inter-particle distances was developed. From regression analyses it has become evident that wear effects arising from coast aggregate fraction and their geometrical parameters surpass the influence of matrix hardness.
Research on the Properties and Application of the New Lightweight Composite Insulation Wall Panel
Authors: Wang Qing Hua , Feng Ye , Wang Chun Peng
Published: August 2013

One kind of engery-saving lightweight composite insulation wall panel is exploited. It can benefit of waste, effectively reduce the structural weight and can be easily to install. Comparing with ordinary concrete wall on thermal property, reveals that the lightweight composite insulation wall panel has better insulation property. Combine with the other properties and engineering applications, pointe out that the properties of the panel meet the National energy efficiency standards and the summer and cold winter energy efficiency design standards requirements of China.
Analysis on Application Prospect of Shape-Stabilized Phase Change Materials in Asphalt Pavement
Authors: He Li Hong , Li Jing Ruo , Zhu Hong Zhou
Published: August 2013

Blends of asphalt and shape-stabilized phase change materials (SSPCM) were prepared by physical blending. Heat storage and thermal stability of asphalt-SSPCM blends were investigated by DSC and TG, chemical compatibility of asphalt-SSPCM blends was characterized by FT-IR, and the application feasibility of SSPCM in asphalt pavement was explored. The results show that asphalt-SSPCM blends have large phase change enthalpy, good thermal stability and chemical compatibility. Based on phase change theoretical analysis and numerical calculation, SSPCM applied in asphalt pavement can actively regulate and control pavement temperature using solar energy conversion or storage, lighten the asphalt pavement diseases related temperatures, enhance the performance of and prolong the service life of asphalt pavement, lower repair and maintenance cost, and enhance driving safety. At the same time, it can also saving energy sources and protect environment. Therefore, SSPCM have broad application foregrounds in asphalt pavement.
The Application of Closed-Cell Foaming Technology in Composite Thermal Insulation Material
Authors: Wang Chao
Published: August 2013

Composite thermal insulation material can be made from expanded and vitrified small balls and other inorganic insulation lightweight aggregate. According to the hydration, hardening mechanism of inorganic gel material and materials thermal insulation mechanism, we can eliminate the heat convection of gas inside the holes by using foaming technology, and micro holes can reduce radiation heat transfer between the pore walls so as to further improve the thermal insulation properties of solid materials.
The Inheriting and Development of Tradition - Analysis of Wang Shu’s Award Receipt and more Architectural Engineering Cases
Authors: Zhang Bin Quan , Chen Yong Sheng
Published: August 2013

City construction is beset with severe problems like homogenization, exotic style copy, barbaric development and short-lived buildings, jeopardizing the traditional culture as well as natural environment. Faced with the status quo, it is not feasible to protect the environment at the cost of social and economic development. City construction thus faces extruding problems. The solution of such problems calls for all-dimensional discussion. The practice of Mr. Wang Shu leads the way.
Innovative Applications of Membrane Materials in Exhibition Design
Authors: Yang Zhu Ge , Xu Meng Ying
Published: August 2013

Membrane materials became the focus of the exhibition design sector in the 1970s and have developed rapidly since then. As a fabric material of excellent performance, the membrane material has been widely and innovatively used in recent years for their features of facilitating construction and transportation, energy efficiency and environmental friendliness, as well as easy combination with other materials and units. Those innovative applications not only render new functions to membrane materials, but also provide new ideas and open a new horizon to the design of the exhibition pavilions. The use of member materials will also become the mainstream of the exhibition design sector in the near future.
Study on Slag Powder Concrete Preparation in Baotou Area
Authors: Li Bin , Wen Yang , Dong Su Fen
Published: August 2013

Using slag powder in concrete, not only can solve the piled slag powder problem in Baotou area, but also can save resources and energy and improve concrete performance, resulting in huge economic benefits. The results showed that slag powder can increase concrete mobility. With slag powder increasing, the C40 and C50 concrete 28d compressive strength increases and then decreases and each age shrinkage values are significantly reduced. When slag powder reach 50% of cement, concrete impermeability and anti-carbonation are excellent and 41.1yuan are saved every cubic meter concrete which lead to great social and economic benefits.
Effects of Expansive Agent and Steel Fiber on the Properties of the Fly Ash Ceramsite Lightweight Aggregate Concrete
Authors: Cao Shi Ping , Zhou Qi Fan , Peng Yi Liang , Li Guo Xin
Published: August 2013

Portland cement, silica fume, superplasticizer and fly ash cemamsite were used to obtain a high strength lightweight aggregate concrete with lower water to binder ratio. An enhancement effect on the strength was gained by adding steel fiber. When the expansive agent added with the steel fiber a synergistic reinforcing effect on the compressive strength, tensile strength and bending strength was obtained because of more energy consumed to pull the fibers out under the different loads.