bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Overload on Bearing Capacity of FRP Reinforced Ground
Authors: Bai Chong Xi , Shao Xin Yan , Wang Qiu Ping
Published: July 2014

Concrete blocks were arranged on both sides of the strip foundation to simulate overload. Model tests with overload or not were conducted, for four test programs including pure sand ground, single plate reinforced ground, double plates reinforced ground and single plate with two anchorage ends reinforced ground. The influence of overload on bearing capacity and settlement of ground, earth pressure and strain of FRP was analyzed. The test results showed that overload can enhance the bearing capacity, and reduce the ground settlement in a certain extent, with the beneficial effects of overload on reinforcement effect being decreased while the amount of reinforcement was increased.
Pullout Test Research on Interfacial Interaction of Reinforced Band and Gravelly Soil
Authors: Wang Yan Li , Cheng Zhan Lin , Zhang Wei , Zuo Yong Zhen , Yu Zhen Lin , Wang Yong
Published: July 2014

Taking steel-plastic composite reinforced band (CAT) and gravelly soil as the test materials, the pullout tests of reinforced band in gravelly soil with different water contents have been carried out by the laminated shear test instrument. The interface friction characteristics between reinforced band and gravelly soil are studied, and the influences of water content on the interaction characteristics are also discussed. Results show that (1) the extraction of reinforced band is a gradual process. The anchor end began to move firstly because of the extensibility of reinforced belt itself. As interface friction gradually transfer backward by, the free end start to move onward, then displacement schedule curves of the anchor end and the free end are gradually parallel, the whole movement of reinforced belt happens immediately. (2) Pulling force and displacement curve of the pullout friction test displays obviously nonlinear characteristics. Pulling force of the reinforced band increases greatly with increasing displacement at the beginning of the test, then decrease with the increasing displacement after the peak value is reached, the force-displacement curves generally exhibit strain soften characteristics. But it present strain hardening trend under greater normal stress, and pullout frictional strength increases with the increasing normal stress. (3) The pullout friction coefficient of the interface is sensitive to water content. It decreases linearly with the increasing water content.
Research on Negative Skin Friction on Pile by a Simple Model Experiment
Authors: Huang Ting , Zheng Jin Hai , Gong Wei Ming
Published: July 2014

Accompanied by the substantive construction of domestic ports, the negative skin friction on pile becomes a common problem. In order to provide references for the related experiment research in the future, the designs of model experiments reported in the literatures were emphatically analyzed and compared. Compared to conventional pile model test, the model test on negative skin friction on pile needs to apply load on soil surface and it is difficult to simulate large surcharge by conventional test methods. An experimental scheme which could produce large surcharge load by conventional test conditions is given in this paper. Pile stress, displacement of pile top and layered settlement of soil was tested under different surcharge level. The depth of neutral point and the group effect of NSF are discussed.
Research on Stability of Foundation Pit Construction
Authors: Dai Heng San , Yang Tao
Published: July 2014

In geotechnical engineering, the support pattern regularly applied is continuous wall, whose high security, strong adaptability, good stability and other characteristics have been widely appraised in engineering circles. This paper use Midas to build the three-dimensional research model on varied construction stages of foundation pit, in which the foundation pit applies the scheme of combing continous wall and inner support. Further more, this paper makes estimation on the machenical stability in varied construction stages of foundation pit and use strength deduction method to analyze the stress and strain conditions of foundation pit in different working states, the results acquired from which researches have certain reference to the engineers.
Research on the Retention Capacity of Ruins Soil under Drying Condition
Authors: Liu Ping , Zhang Hu Yuan , Chen Yi , Shao Xian Xian , Fu Xin Yuan
Published: July 2014

The soil water characteristic curve (SWCC) has been tested during the drying process. In order to define the relationship between suction, degree of saturation and void ratio, fitting models of SWCC was established. Studies have shown that the shape of SWCC of three kinds of samples (taken from Jiaohe, Gaochang and Jiuzhoutai) was similar to the inverted “S”, the relationship between water content and matric suction was inversely proportional. Under the condition of the same moisture, the matric suction of the Jiaohe and Gaochang samples were greater than the Jiuzhoutai samples, and the changes of pore water pressures showed the same trend. The degree of saturation began to decrease when the water content reduced to the air entry value. When the degree of saturation was greater than 90%, the volume of soil samples contracted significantly, and when saturation is below 80%, volume shrinkage stopped.
Study on the Design Method of Different Thickness-Diameter Ratios for Composite Foundation with Rigid Long and Short Piles
Authors: Tong Jian Xing , Sun Xun Hai , Luo Peng Fei , Jia Ning , Yang Xin Hui , Yan Ming Li
Published: July 2014

Composite foundation can be designed as long and short piles that lie on different bearing strata with high bearing capacities. Researches have shown that for foundation with sufficient stiffness, the ratio of the thickness of cushion to pile diameter (thickness-diameter ratio) plays an important role on the exertion of bearing capacities of pile and soil between piles. Traditional method just applies equal thickness-diameter ratio to design composite foundation with long and short piles, which hinders the exertion of bearing capacity of composite foundation. To overcome this defect, this paper studies the relations between thickness-diameter ratio and the exertions of bearing capacities of pile and soil between piles. The design method of thickness-diameter ratio for composite foundation with long and short piles is also proposed in this study.
Three-Dimensional DEM Numerical Simulation of Rock Failure Progress with Different Microscopic Heterogeneities
Authors: Chen He , Fang Rui , Li Ya Jun , Zhang Fa Chun
Published: July 2014

A three-dimensional DEM numerical model for analyzing rock failure process was developed by taking heterogeneities on microscopic scale into account with statistical mechanic. Failure processes of a series of rock samples with different heterogeneities were numerical simulated by uniaxial compressive tests. The influences of microscopic heterogeneity on macroscopic mechanical properties and failure behaviors were investigated. The results demonstrate that the numerical tests are able to illustrate the crack propagation occurring in different stages, and to predict the characteristic stresses and strains. With the increasing of heterogeneity index, except for Poisson’s ratios and crack damage strains that almost maintain constant, deformation parameters as well as characteristic stresses and strains increase following exponent functions. As heterogeneity increases, elasticity deformation of rock samples becomes longer, volume compression reduces, brittle failure characteristic presents more significant, failure mode changes from “X” pattern to coalescence surface pattern forming through the whole rock samples.
Analysis of Structural Soil’s Shear Strength under Arbitrary Degree of Consolidation
Authors: Liu Yang , Sun Chao , Li Shuang
Published: July 2014

Mohr-Coulomb strength theory is the most widely used in practical engineering, however, it is difficult to predict the cohesion and internal friction angle precisely. In fact, soft clay’s shear strength varies with the change of stress path and consolidation history, so it is vital to predict the shear strength in different construction phases, and the influence of soil structure is necessary to be taken into consideration to predict the shear strength under under arbitrary degree of consolidation. This study proposed a simple shear strength fomula under arbitrary degree of consolidation considering the enfluce of soil structure. The derived formula is much more convenient to plug the changing strength index into program.
Development of the Monitoring Guidance System for Slope Engineering
Authors: Kong De Heng , Ruan Yun Kai , Zhang Zhi Gang , Mao Wen Fei , Li Ming
Published: July 2014

The slope monitoring is an important part of the slope engineering. Through the reasonable monitoring, the engineers can get all kinds of information and the state of slope stability; provide scientific basis for the forecast about instability. Facing various methods and diverse information, the engineers can not consult books and make project efficiently. Based on the objective of safe construction, a database system including a comprehensive range of information about monitoring design, construction technology and equipment is built by achieving the design ideas of rapid and concise. By utilizing the development tools of Visual Basic and database platform of Access, the monitoring guidance system is developed with the consultation, editing, and analysis functions. The system provides a complete slope monitoring information platform to guide the engineering staff to quickly and accurately develop the design of slope monitoring.
Numerical Simulation of Slope Excavation in Highway Renovation and Expansion Project
Authors: Luo Gen Chuan , He Zhong Ming , Luo Xin , Hu Qing Guo
Published: July 2014

Slope stability analysis requires detect and control the stress and strain timely. Familiar with the slope‘s stress and strain changes in excavation process has important guiding significance for the actual construction. In this paper, choose a slope in Guangxi freeway renovation and expansion process as the research object. Use FLAC3D to analysis the stress and displacement simulation results of this slope excavation step by step. Summarize the excavation regular pattern.
Finite Element Simulation and Stability Analysis of Composite Soil Nailing
Authors: Zhao Jie , Wang Ling Li
Published: July 2014

Under the condition of plane strain, a 2D elastoplastic FEM is used to analyze the behavior of composite soil nailing bracing of deep excavation, then finite element method of stability analysis is applied to evaluate the stability of the soil-nail wall. The authors analyzed the difference between composite soil nailing and normal soil nailing. Through analyzing the effect of bracing parameters on the deformation behavior and stability of the excavation, some useful conclusions are obtained to provide certain references for the design and construction of composite soil nailing.
Control Function of Corrosion of Calcareous Sandstone over Rock Mass Quality in One Hydroelectric Station on the Jinsha River
Authors: Lu Shu Qiang , Zhu Peng
Published: July 2014

The hydro-electrical power station is planned to be built on the Jinsha River. The regional geologic structure is complex. On the basis of the geological engineering conditions and rock mass quality classification, the change of wave velocity of rock mass is used to analyze systematically the control function of corrosion of calcareous sandstone over rock mass quality. The modificatory standard of rock mass quality classification and the system of rock mass quality classification in the hydroelectric station have been carried out. The main results can be taken as the basic data and the theoretical proofs to evaluate the engineering rock mass stability.
Searching for the Shortest Seepage Path of 3D Network in Fractured Rock Masses
Authors: Pan Bin , Zhang Yang Song
Published: July 2014

Fractured rock is a combination of rocks and fractures,the fractures which are ubiquitously distributed in fractured rock mass often constitute the flow and migration path of underground fluid and radionuclide.Discrete Fracture Network Model (DFN) was built with in-situ observations to evaluate the hydraulic conductivity tensor of rock masses.The fractures relation pattern with corresponding algorithm is given on the basis of computational geometric,and then the graph theory is employed as the mathematical model to represent the mutual positional relation of fractures.And then,with the use of Dijkstra algorithm, the hydraulic conductivity tensor could be obtained.
The Application of Reservoir Geo-Modeling Technology in Section07, Ticleni Oilfield
Authors: Pang Ling Yun
Published: July 2014

In the study of reservoir geo-modeling in Ticleni oilfield, structural model, the spatial framework of the geo-model was firstly constructed based on seismic and petrophysical data and integrated geological background analysis. Then the variogram function was analyzed based on petrophysical data and sedimentary setting analysis, and the litholofacies model was established. Finally, the property models were constructed with reservoir physical property controlled by lithofacies model. Therefore, the quantification of geological study achievements and the distribution of reservoir physical property are effectively combined, which provides the foundation for the sequent reservoir development of Section07.
The Genesis Mechanism Analysis of Qinglong Landslide in the Central Region of Yunnan Province Water Source Diversion Reservoir Area of the Jinsha River
Authors: Song Teng Jiao , Chen Jian Ping , Li Xin Jie , Yan Ji Yu
Published: July 2014

Qinglong landslide is a very typical landslide in the central region of Yunnan Province water source diversion reservoir area of the Jinsha River. The geological background of the landslide region is introduced,including Landform, stratum lithology and geological structure and hydrogeological condition. Based on the collected geological data and according to the results of site investigation, the complete picture of Qinglong landslide is provided. Then the image of 3d vision is made. The longitudinal profile and cross-sectional profile are drawn. At last, The genesis mechanism of Qinglong landslide is analyzed from the point of landform, Rock mass structure and Geological structure. The study is helpful to understand the status of other landslides and can provide the basis of appraisal of reservoir bank stability.
Experimental Investigation on the Physical and Mechanical Features of Clay Shale in Bayingobi Basin of Inner Mongolia
Authors: Liang Hai An , Lu Qing Rui , Chen Shi Jun , Hu Hai Yang
Published: July 2014

The basic physical and mechanical characteristics of Clay shale in Bayingobi Basin of Inner Mongolia have been investigated by using supersonic testing system, rock mechanical testing system, and rock triaxial testing system. The results indicate that the deep clay shale of this region is characterized by high density, high mechanical strength, low deformation and strong brittleness. More specifically, according to the tests, because of their relative small particle size, the carbonate grains of clay rocks in this region are distributed more uniformly, and the average clay mineral content is comparatively low, as a result, the deep clay shale of this region are featured by large internal friction angle and high mechanical strength.
Stability Analysis of Gypsum Mine Goaf Surface Based on Discrete Element Method
Authors: Liu Xiu Min , Chen Cong Xin , Xia Kai Zong , Huang Ping Lu
Published: July 2014

Considering rock joints, the discrete element method was used to study gypsum mine surface short-term and long-term stability. Filling method and caving method were selected as the surface treatment. Through comparison, Caving method is more suitable for handling the gob of gypsum mine. Surface movement angle and subsidence angle were obtained on the basis of the plastic zone, surface tilt rate and surface horizontal strain, and whereby draw a goaf risk areas to guide residential relocation. The research methods and conclusions in this paper can provide reference for the study of the empty area stability in gypsum mining currently.
Automated Analyzer, LOI and other Methods for Determination of Soil Organic Carbon
Authors: Zhang Yi Yu , Zhang Wei Hua
Published: July 2014

SOC as a significant quantity for the global carbon cycle, makes great sense in soil management and future climate scenario. With more and more researches carried out on SOC, methods used to the determination of SOC have being formed: automated analyzer, LOI and some others, such as using climate change information and remote sensing technique. The objective of this paper is to discuss advantages and disadvantages of automated analyzer (C-N analyzer) and LOI, and provide some references in selecting the appropriate measuring methods of SOC for the readers.
Study on Rock Strength Characteristic by Point Load Test
Authors: Wang Rui Hong , Jiang Yu Zhou , Guo Jin Long , Tang Tian Cai
Published: July 2014

Test point load test requires relatively small load, its instrument is portable, it can be easily applied to on-site testing,which may pave the way for the development of the fieldstrength of rock mechanics test, widely promoted in engineering construction, has a large space for development. When selecting the uniform rock do the load and saturation points uniaxial compression test respectively, and comparing the analysis of the two trials correlation between the results obtained by the method, the results showed that: point load test as a qualitative and semi-quantitative indicators are needed to meet the requiement of project, but if we put it as a fully quantitative indicators ,which will lead to large errors,and even lead to sweeping errors.
Coordinate Transformation and the Volume Covering Fractal Algorithm of Rock Surface Morphology
Authors: Man Ke , Zhao Yang , Li He Fei
Published: July 2014

The mechanics characteristics of the rock are mainly subjected by the joint and the fractures of the rock mass. For the joint, the surface morphology is especially the dominant influence factor. In order to describe the nature physics of rock surface, the surface morphology embarked on a fractured granite rock is described. And use the fractal dimension to calculate the volume of covering rock fracture surface, the relationship between fractal dimension and physical characteristics of rock surface.
Anisotropic Bounding Surface Model in ABAQUS Software
Authors: Qin Ya Zhou , Chen Qi
Published: July 2014

This paper presents an improved anisotropic bounding surface model which is based on Wheeler’s elastoplastic model (S-CLAY1). The developed model is programmed in ABAQUS software by writing UMAT subroutine, which is integrated in Return Mapping Algorithm. The parameters sensitivity analysis is implemented on plastic modulus. The study shows that the developed anisotropic bounding surface model is capable of describing the dynamic properties of soft clay.
Numerical Analysis of Construction Method in Shallow-Buried Large-Section Loess Tunnel
Authors: Sun Zhi Jie
Published: July 2014

To research the deformation regularity of large section loess tunnel in construction procession with different construction methods, 3D Numerical Simulation is applied and the large-section loess tunnel of highway is taken as an example. Comparing deformation regularity of surrounding rock in three types of construction method conditions, the research results show that:The CRD method takes precedence in the condition of the convergence of surrounding rock is large. The both sides heading method takes precedence in the condition of ground surface settlement is large.
Study on Chloride Penetration Resistance of High Volume Slag Powder Concrete
Authors: Ding Hong Xia , Wang Chun Tao , Ge Bin , Li Yun Sheng
Published: July 2014

The influences of Portland cement substituted by slag powder in a high proportion (50% and 70%) on the chloride penetration resistance of concrete were studied. The results show that: the penetrability of Portland cement concrete reduced by one grade if 0.5% water reducer is added, but the water binder ratio is not the decisive factor for the permeability. There is a negative correlation between 6h electric flux and compressive strength only when concrete with same cementing materials. High volume slag powder concrete has excellent resistance to chloride ion permeability, which declines further with the increment of slag powder quantity added, the permeability coefficient of the concrete with 50% and 70% content of slag powder is as low as 27.8%~32.3% that of Portland cement concrete.
Study on Temperature Effect of the Super-Long Concrete Structure in Electrolytic Aluminum Plants
Authors: Yin Ying Zi , Li Bing Wen
Published: July 2014

Due to the demand of the architectural features and production processes, so that the structure can’t be constructed according to specification requirements to set corresponding expansion joints. This leads to the structure to form a super-long concrete structure. Such structures have large force and deformation under the action of temperature, and even cause cracking of the structure, which seriously impacts on the safe and proper use of structure. Further, if the structure is longer than the specification maximum spacing of joints, just relying on the qualitative construction measures to deal with the impact of the temperature effect on the structure can’t meet the requirements of structural design. Meanwhile, now the quantitative calculation of temperature effect isn’t unified at home and abroad，the adverse effect of the structural temperature effect is an urgent problem. In this paper, regarded the actual electrolytic aluminum plant long concrete structure as the research object, and used finite element analysis program to study the quantitative analysis to explore the laws of temperature stress and deformation size of the long concrete structure. It provides a reference for the construction and seamless design of future similar structure.
The Change of Stress on Marine Concrete Covered with Barnacles
Authors: Wang Gen Li , Ye Zheng Mao , Wu Bin
Published: July 2014

Barnacle is a major creature in marine fouling organisms, it increases static load and dynamic load of marine structures. In this paper, the change of stress on marine concrete surface covered with barnacles is studied. Moreover, a simplified model is established. The result shows that the stress of seawater increases by 0.53 times on the concrete surface, which is covered with barnacles.
The Simulation Analysis of the Bearing Capacity of the BFRP Reinforced Concrete Columns
Authors: Li Ke , Wang Ru Heng , Mo Jun , Jia Bin
Published: July 2014

The behavior of the bearing capacity of the reinforced concrete columns confined with basalt fiber reinforced plastic sheet (BFRP) under axial compression is analyzed by the finite element method, and obtain the ultimate compressive strength and stress distribution of the BFRP. The analysis results show that the simulation results agree well with the experimental results, the strength and ductility of the BFRP reinforced concrete columns are improved obviously. The ratio of the strength test values and simulation values is between 0.91~1.14, the error is within an acceptable range. Then based on the strength of FRP confined concrete columns model, the test values are compared with those of the strength model calculation values, the ratio of the simulation values and calculated values is ​​between 0.94 to 1.03,that means the simulation values are credible. The mechanical properties of the BFRP reinforced concrete column are improved significantly.
Pavement Performance of Foaming Warm Mix Asphalt with RAP
Authors: Li Liang Ying , Yang Xiao Long , Cao Gui
Published: July 2014

Foam-based WMA are the most commonly used techniques. Gansu Department of Transportation recently let its first foaming warm mix asphalt in RAP project in response to need to evaluate the foaming warm mix asphalt technology in RAP and how it correlates with material specific to Gansu Province. Three foaming warm mixtures with RAP were designed. Based on this, Marshall volume indicators and pavement performance were tested and contrasted for three foaming warm mixtures with RAP and corresponding HMA. Foaming warm mixtures with RAP were produced at 130°C-140°C which is lower 10°C-20°C. The result show that 15% to 30% RAP can be added into foaming warm mixtures. Foaming warm mix asphalt technology can reduce 20°C of compaction temperatures compared with HMA. And its pavement performance can meet regulatory requirements.
Environment Evaluation Standard Analysis of POE of Winter City Commercial Buildings
Authors: Liu Jia Sheng
Published: July 2014

In the Post Occupancy Evaluation(POE) of Winter City Commercial Building, the author, taking the building users (shoppers and managers) as the evaluation subjects, explored all kinds of environment involved in the use, and analyzed the environment evaluation standards, to establish POE system of winter city commercial building.
Thermal Expansion Coefficient Prediction of Asphalt Mixture with the Eshelby Equivalent Inclusion Theory
Authors: Wu Jun
Published: July 2014

Asphalt mixture was considered as a two-phase composite, in which coarse aggregates are embedded into asphalt mastic matrix, namely a mix of fine aggregates and asphalt, so that a theoretical framework was proposed to correlate its effective thermal expansion coefficient with its components and microstructures based on the Eshelby equivalent inclusion theory. A four-parameter model with the experimentally determined parameters was used to characterize the viscoelastic constitutive behavior of asphalt mastic. The thermal expansion coefficient prediction of asphalt mixture was conducted and compared with the predictions by the sparse method and the self-consistent method. It was revealed that the prediction from the proposed theoretical framework is reasonable.
Modelling of Micro-Concrete Behaviour under Static and Dynamic Loading
Authors: Boutemeur Remdane , Demidem Mustapha , Bali Abderrahim , Benyoussef El Hadi
Published: July 2014

The aim of this study is to present a model for assessing the dynamic compression behaviour of a micro-concrete. This model is based on the results of numerous tests providing the developments of the mechanical characteristics of the material on a wide range of strain rate from 10-4s-1to 10+3s-1.The Split Hopkinson Pressure Bar (SHPB) dispositive, based on the wave propagation theory in materials, has-been adopted to carry out the dynamic tests on the investigated material. The proposed model is composed of two terms, each characterizing the different contributions noted in the two major explored areas of strain rate.
An Investigation into Magnetic Roasting-Separation of Refractory Iron Ore in Suspended State
Authors: Li Qi , Chen Yan Xin , Song Qiang , Yao Yan Fei
Published: July 2014

Aiming at the disadvantages of traditional magnetic roasting process, suspension calcining process was suggested to dispose refractory iron ore. The experiment indicated that under the conditions of 750°C~850°C, CO volume percentage was 1%, the limonite and siderite could efficiently transformation into magnetite, which only needed 10~20 secs. Tests of roasting-magnetic separation could attained results as: concentrate iron grade be 49.26%, recovery of iron be 87.28%.
Crafts and Material Analysis of the Three Gorges Tourism Souvenirs
Authors: He Guang Qing
Published: July 2014

The design of tourist souvenir is the structure of the tourism industry needs, is also the important direction of regional economic development. In this paper, aiming at the application of traditional crafts and materials in the three gorges local features, more manifests the design value of the tourist souvenirs. As the modern tourism market the goal of sustainable development, through continuously improve product innovation and research and development mode, to better service to the all-round development of the three gorges tourism market.
Effect of Rheology-Regulation Additives on the Formwork Lateral Pressure of the Self-Compacting Concrete
Authors: Chen Hui , Yang Jian Ming , Zheng Jia Wei
Published: July 2014

This article mainly aims at to research the affect of thixotropy on the development of the formwork lateral pressure, the ultimate goal is to minimize the potential safety hazard of construction.Before the experiment, through the tests of net cement slurry, we can determine kaolin (additive) to change the influence of the liquidity of concrete. For the mixture of self-compacting concrete (SCC) ,set different content of admixture. Through experimental simulation measurement in 4 meters height of concrete pouring and pouring diameter of 150 mm, test the size of the lateral pressure casting the bottom template, and compare the condition of not using mineral admixtures, helps to identify the most appropriate for the amount of admixture.
Study of Highway Coarse Aggregate Gradation on Airport Pavement Concrete Design
Authors: Ma Dao Xun , Liu Yan , Lai Yong
Published: July 2014

This paper chose 5~31.5 mm coarse aggregate (commonly used in highway) to supersede 5~20 mm, 20~40 mm double-graded coarse aggregate (commonly used in airport pavement), studying the influence of 5~31.5 mm coarse aggregate on the airport pavement concrete. The results show that the flexural strength and loss rate of relative dynamic elastic modulus of airport pavement concrete prepared with 5~31.5 mm coarse aggregate meet the airport pavement design requirement, the optimum mix amount is the water-cement ratio of 0.40 and the unit cement consumption of 330 kg/m3, and for frost resistance durability after 200 freeze-thaw cycles, the relative dynamic elastic modulus is still above 90%.
Analysis on the Integration Form of the Marginal Culture of Harbin Daowai
Authors: Sun Zhi Min
Published: July 2014

Dowai, which belongs to the marginal culture of Harbin city, has the typical characteristic of the marginal culture. And the Chinese culture and the western culture are recombined in here. This recombining culture embodies the core culture spreading to the marginal state, and reflects the cultural collision and the cultural interwined. The paper analyses on the integration form of the Dowai architectural culture.
Carbonation Property and Prediction of Concrete Mixed with Alkaline Potential Water
Authors: Miao Chen , Sun Bing Quan , Wang Li , Zhang Da Wei
Published: July 2014

This study investigates carbonation properties of concrete mixed with alkaline potential water (APW). A miniature electrolyzer made up of diaphragm electrolytic cells was made to produce APW. Results show that APW concrete gains greatly in carbonation property - carbonation depth deepened by 21% in the 28day fast carbonation test. A new mold is developed to make concrete samples with spherical concaves which promised a smooth test surface to the sample, realizing the lossless test of concrete carbonation. A long term carbonation test (90 days) of concrete mixed with ARPW is carried out. Applying grey system theory, the time dependence rule, which decides the dynastic model of carbonation formula is studied, offering a more scientific basis for estimating the structural durability of concrete.
Corrosion Resistance of 50 Years Concrete Exposed to Saline Areas
Authors: Zhang De Cheng , Lv Yan Ping , Fan Sheng Li , Ouyang Min , Xu Xiao Lei
Published: July 2014

The Hong Run petrochemical oil depot is located in a saline area in the north of Weifang, where the contents of chloride and sulfate in this area are very high. Due to the rigorous environmental conditions, concrete with 50 years durability and C40 strength grade was prepared. A kind of corrosion resistance concrete with high performance superfine mineral powder and high performance pumping agent was developed to adapt to the conditions in saline areas. The chloride-penetration resistance ability was investigated by the test of chloride ion rapid electric transport (ASTM C1202). The concrete compressive strength and mortar expansion rate under continuous immersion in four different corrosion solutions was studied. The results showed that the chloride-penetration grade is very low. The compressive strength is high and the mortar expansion rate lower than 0.1%.
Investigations on the Impact of Non-Longitudinal Cracks on the Durability of Concrete Structure
Authors: Zhou Xiu Jing , Shu Jia Ming , Wu Bo Ming , Ren Xv Chu , Gan Wei Zhong
Published: July 2014

Concrete structure is widely used in civil engineering. Concrete cracking, a common and frequently occurring disease, is one of the main factors that cause impaired concrete structure durability. This paper analyzes the generation process and features of non-longitudinal concrete cracking. With on-site investigation of selected buildings in Ningbo, the paper discusses the main existing non-longitudinal cracks and their impact on the durability of concrete structure.
Quantitative Evaluation on Pozzolanic Reaction of Silica Fume and the Time Dependent Development of Portlandite in Composite Cementitious Systems
Authors: Wei Yong Qi , Yao Wu
Published: July 2014

Quantitative X-Ray Diffraction (QXRD) with Rietveld full pattern fitting method and the hyphenated technique of ThermoGravimetry (TG) with Differential Scanning Calorimetry (DSC) were used to explore the effects of silica fume (SF) on hydration process of composite cementitious system (CCS) as well as the pozzolanic reaction (PR) of SF in this system. Results indicate that the PR of SF has started at the end of the first day but proceeds very slowly during the rest days due to the agglomeration of SF particles; and the starting point of PR is far earlier than that of drop of CH content, which implies that it is not suitable to mark conventionally the drop of CH content as the starting point of PR.
Shaking Table Test of Eccentric Reinforced Concrete Frame-Shear Wall Structure Model
Authors: Li Bing , Lu Li Na , Lv Hai Tao , Li Xu Fang
Published: July 2014

Reinforced concrete eccentric frame-shear wall structure has been widely used in engineering. However, this structure is mainly used for high-rise structure, and it is difficult to obtain accurate earthquake response of structure through experimental study. Therefore, simulation software needs to be used for study on seismic performance of high-rise structures. This paper produces useful conclusions for the project through shaking table test and the simulation of seismic performance provided by ANSYS finite element analysis software.
Study on the Alkali-Free Liquid Accelerator
Authors: Wang Ji Liang , Song Jing Liang , Liu Kang , Wang Da Peng
Published: July 2014

Based on orthogonal design method, a kind of alkali-free liquid accelerator is successfully developed by adopting aluminum sulfate, DL-Lactic acid, triethanolamine, glycerol, phosphoric acid and other raw materials. The initial setting time of the accelerator is 2min50s, and final setting time is 6min30s. The compressive strength ratio of 28 days is 103.5%. All the indices meet the first class requirements in Flash setting admixtures for shotcrete (JC477-2005). It is also provided with better adaptability. Finally XRD testing method is adopted to reveal the fast-setting mechanism of alkali-free accelerator.
The Aggregate’s Influences on Properties of Porous Pervious Concrete Made of Recycled Aggregates
Authors: Gong Ping , Zhang Wen Liang
Published: July 2014

In this study,different particle size’s aggregates ,different aggregate correction coefficients and different sand ratio were selected to study the aggregate’s influences on properties of porous pervious concrete made of recycled aggregates.The results shows that the 28-day compressive strength of concrete with single particle size is lower than those with two kinds of particle mixing ,as for the permeability coefficient, the former is much higher than the latter .With the aggregate correction coefficient’s increase,the 28-day compressive strengths of concrete increases first and then decreases, the permeability coefficient increases . The 28-day compressive strengths of concrete increases with the increase of the sand ratio. the permeability coefficient increases first ,decreases then.
Experimental Study on Fatigue Performance of the Reinforced Concrete Beam with Stainless Steel Rebar
Authors: Zhang Guo Xue , Huang Jia Wei , Chen Zi Qing , Zhou Xi Wu
Published: July 2014

Based on the fatigue test of 6 stainless steel reinforced concrete beams, number of stress cycles, dropping-coefficient of stiffness and crack width are studied. This paper mainly discussed, under different stress states and reinforcement ratio, the influence of the reinforced concrete beam with stainless steel rebar on crack development, deflection and fatigue life. It can be concluded that, the fatigue life of the stainless steel reinforced concrete beam will go up as the stress decreases. Based on the analysis of the test results, the S-N curve can be deduced.
Experimental Study on Mechanical Behaviors of Precast Concrete Shear Wall with Vertical Joint
Authors: Zhao Qin Yan , Zhang Zhong Yong , Qiu Guang Ming , Liu Ji Liang , Chu Ming Jin
Published: July 2014

Precast two-way hollow slab concrete shear wall is a new structure adapted to housing industrialization. To study the effect of the vertical joint on mechanical behaviors of shear walls, one reinforced concrete shear wall and two precast concrete shear walls built with hollow slabs were quasi-statically tested under low cyclic loading. The study of failure mode and failure process of specimens shows that vertical macro-cracks occurred in precast walls under loading, which made failure behavior of walls evolve from integral wall into split wall. It also shows that relative deformation formed along the vertical joint before peak load, so the ductility of walls is increased. New type shear walls exhibit good ductility and brittle shear failure can be avoided effectively.
Research on Ordinary Concrete Durability
Authors: Cheng Peng , Chen Xin Fu , Wu Lang
Published: July 2014

This paper introduces the common concrete durability research background of the status quo, summarizes the corrosion resistance of concrete under the background of the main influence factors. The corrosion types and corrosion mechanism of concrete are discussed, including the corrosion mechanism of concrete base material of cement, steel corrosion mechanism and corrosion mechanism of reinforced concrete structures. From the research and the analysis of the structure formation of ordinary concrete, summarizes the common strength grade of concrete high performance-based approach.
Ready-Mixed Concrete Green Production Matrix
Authors: Wu Jiao Jiao
Published: July 2014

This paper establish a whole concrete production process-based matrix with the whole concrete production process as coordinate and the three principles (maximum utilization of natural resources, minimization of pollution, optimization of plant construction) as abscissa, and put forward the key technologies and management measure to provide reference for the green production in Ready-mixed concrete industry.
Based on the Genetic Algorithm to Optimize the BP Neural Network in the Degree of Concrete Creep Prediction Model
Authors: Yao Hui Qin , Jiang Ye Long
Published: July 2014

The BP neural network model for creep degree of concrete is established,in which concrete age under load and loading time as input variables and the creep degree of concrete as output variable. In order to get best optimal weight and threshold of the BP neural network, genetic algorithms method has been used by selection, crossover and mutation operation. The BP neural network model is applied to the engineering of “515”dam.Comparison the prediction results of the BP neural network and the eight-parameters formula of concrete creep degree, the BP neural network model has high prediction accuracy. What’s more, this intelligent prediction model for creep degree of concrete has good credibility and reference value in practical engineering.
Expermental Study on the Mixture Ratio and the Compressive Strength of Concrete with Recycle Crushed Brick Coarse Aggregate
Authors: Liu Qin , Zhang Xiao Na
Published: July 2014

Considering the high absorption of water is a distinctive feature of recycled crushed bricks coarse aggregate, the mixture ratio text of recycled concrete using crushed bricks as coarse aggregate is carried out, and the compressive performance is studied.The resert indicate , the strength grade of recycled concrete which using bricks as coarse aggregate can reach C20 and C25, characterisitic value of cubic concrete compressive strength at the age of 28 days are 21.2MPa and 27.55MPa;Based on regression analysis of test data , the formulas which estimated the strength of recycled coarse aggregates concrete are given out. Calculated values are in agreement with the measurement values, which can provide a reference for engineering application.
The Architecture Space Design for Commercial Display Based on Regional Division of Environment
Authors: Guo Yi Zhang
Published: July 2014

This paper firstly introduces the types of architectural space for display. They are usually distinguished by the different nature and characteristics, in order to facilitate the selection and use in the design space. Then, the composition of the indoor space is introduced, which includes the ground, walls and top surface. Finally, the method of architecture space design for the commercial display is presented. According to the size and shape of space, the rational decoration is employed to create the application, the appearance of the indoor environment. The design of indoor ground and wall to set off people, furniture and furnishings background, and the top surface of the differences in the design of indoor space is full of change.
Analysis of Application of Molecular Sieve on the Woody Fire-Retardant Research
Authors: Chen Xing Yan , Tao Tao
Published: July 2014

In the past decade, molecular sieves are applied to the flame retardant research areas. This article introduces the types and functional features of molecular sieve, especially the properties of mesoporous molecular sieve, the function of porous channel system, the method of controlling the aperture and the way of functional modification. On the basis of induction and analysis of molecular sieve in fire-retardant research, I have made three points: (1) Molecular is a good kind of fire-retardant synergist; (2) A little molecular added is enable to improve the ability of fire-retardant materials; (3)Bringing the molecular sieve into woody material is in the trend of smog-retardant, low-poisonous, environment-friendly.
The Challenges of Nigerian Hospital Ward Setting in Providing for Family Participation
Authors: Alkali Ibrahim Abubakar , Ahmad Moh'd Hamdan Hj , Said Ismail
Published: July 2014

Healthcare facilities design is a complex and dynamic process that considers meeting the needs of each of its stakeholders. The design becomes more complex when it involves building for particular user groups with non-standard specification. The Nigerian healthcare delivery system like many other health care systems in developing countries requires active participation of the patient's family member. However, the hospital setting in Nigeria has not been configured to accommodate their stay. This qualitative study is carried out to explore the extent of family participation in caring for their hospitalised ones with a view to identify design indices that will guide Nigerian hospital ward design. Data was obtained through observation and unstructured interview in a typical adult male and female surgical wards in one of the tertiary hospitals in Nigeria. Data was analysed using classical content analysis method. The result shows the design indices generated from patient's families involvement required in the Nigerian hospital ward configuration.
Recycled Aggregate Concrete Mixture Proportion Method Based on Pulp Content
Authors: Han Qing , Jia Zong Ming , Sun Dong Ye
Published: July 2014

Putting forward a new recycled aggregate concrete mixture proportion method based on the pulp content by researching the effect of pulp content on recycled coarse aggregate physical properties .Research on the cube compressive strength and splitting tensile strength of recycled aggregate concrete by the proposed method and results showed that:The proposed method can reduce the dosage of cement and sand, and increase the recycled aggregate concrete compressive strength and splitting tensile strength ;Establishing the relationship formula between splitting tensile strength and compressive strength of recycled aggregate concrete upon a large number of experimental data.
Silica Sand Powder Mixed with Slag Powder Complex Technology Used for PHC Piles Production
Authors: Jiang Yuan Hai
Published: July 2014

Design concrete mix used in the PHC pile production, silica sand powder and slag powder as a concrete admixture, replace a certain percentage of Portland cement, under the premise of meeting the PHC pile production requirements. After the steam curing, determinate the demould strength of concrete and after autoclave curing, determinatie the compressive strength of concrete. Test results show that it is feasible for the use of silica sand powder and slag powder instead of Portland cement , in which the proportion of concrete admixtures up to 45%. Silica powder and the amount of slag powder were mixed with 150 kg/m3, 50 kg/m3, the concrete demould strength up to 49.1 MPa and the compressive strength after autoclave up to 89.0MPa, to achieve requirements of the national standard GB13476 .
Analysis of Developing Compound Insulation Blocks from Wall Self-Thermal System
Authors: Guo Hai Yan , Ye Jian Bing
Published: July 2014

This paper analyzed the compound thermal isolation building blocks based on sintering shale hollow bricks. This work has redesigned the shape of building block, besides, optimized the holes in it and filled the thermal insulation materials in holes, thus the new compound sintering hollow bricks have a good thermal performance and mechanical performance. After the analyzing of the filling devices, the amount and value of productions have both improved.
Study on the early Hydration of Alkali-Activated Slag Cementing Materials
Authors: Shi Jin Song , Yuan Xiao Hui , Chen Hui Guo
Published: July 2014

The early hydration of alkali-activator slag(AAS) cementing material is studied by changing the environment temperature, the proportion of slag and fly ash, water glass module, and dosage of sodium silicate. The results show that as the temperature raise, the hydration rate and hydration heat of the AAS cementing materials will remarkably accelerate. Joining coal ash in the pure slag cementing material can effectively slowdown its hydration reaction, and the hydration heat is also reduced.
Influence of Silica Fume on Mechanical Property of High Performance Concrete
Authors: Li Yun Feng , Zhu Jian , Xu Li
Published: July 2014

Silica fume is a by-product in the production of ferrosilicon and industrial silicon material. With the ultrafine physical structure of and high volcanic ash activity, silica fume is more important admixture in concrete improving the strength and durability of concrete, and it is widely used in high performance concrete engineering. Influence of silica fume on mechanical property of high performance concrete is investigated in this paper. Experimental results show that the strength of concrete increases significantly when suitable dosages of admixtures is applied.