bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Manufacture of Short Mullite Fibers by Andalusite Mineral of Mei County China
Authors: Shi Zhen Wu , Xie Nian Suo
Published: September 2011

The short mullite fibers were manufactured by andalusite mineral raw materials of Mei County China through isothermal sintering process between 1350°C and 1550°C under the oxidation atmosphere. And then the process which andalusite mineral raw materials of Mei County China had transformed into short mullite fibers was analyzed by X-ray automatic powder diffractometer D/MAX-2400, and the property of morphology of short mullite fibers was observed by scanning electronic microscope QUNATA200. The result manifests that in the range of experimental temperature, andalusite mineral raw materials of Mei County China fully transforms into mullite phase after the specimen is kept warm for 3 hours under sintered temperature 1450°C, and the mullite phases which are transformed at sintered temperature 1450°C mostly present in the form of short fiber while the temperature naturally cools to room temperature with furnace, and this kind of short mullite fiber has the best crystallinity, and the least structural defect and the highest length to diameter ratio.
Treatment of Succade Wastewater with the Coagulating Agents PAC and Ferrous Sulfate
Authors: Zhang Yong Li , Zhang Yu Xiu , Wei Chao Hai
Published: September 2011

Succade wastewater, which was produced in manufacturing process, was treated with two kinds of coagulating agents PAC and ferrous sulfate. The influences of pH, concentration of coagulating agent on COD value, turbidity have been studied. The results of the experiments have shown that for ferrous sulfate, there is an obvious positive correlation, but no significant relation with turbidity removal rate was presented in the statistics; As for PAC, the turbidity declined significantly as PAC dosage increases, only when pH=5 that COD removal rate shows a clear positive correlation with PAC dosage.
A New Learning Method Based on Cybernetics
Authors: Tang Hong Mei
Published: September 2011

Based on cybernetics, feedback and other theories, the paper first introduces something about the learning system and then puts forward a new learning method-active input and active output method. In connection with the current problem of college students’ not very high learning efficiency, this paper, with college students as the subject of study, cybernetics as theoretical basis and experiment as verification means, makes a deep study on the factors influencing the language output of Chinese college students, puts forward the English learning model of active input and active output. The research indicates that in the current non-immersion learning environment, the active input and active output leaning theory will not only help learners to form new acquisition of language, improve comprehensively their discourse behavior, but also to spur on learners to make use of all their resources to improve their communicative competence. College students, who adopt such learning methods, show a higher enthusiasm and stronger confidence in studying English.
Study of Dynamic Visual Query Demonstration System for Steel Bridge Constructing Process
Authors: Jiang Hua , Wei Qun , Peng Yun Dong
Published: September 2011

Based on Vb programming language, combined with the large span suspension bridge in the project construction management, research and development of a visual simulation of integrated system platform, achieve the data call and control on the dynamic 3D visual simulation model. Ready to deal with various types of data required for the project, and fundamentally changes the method of mass data management, to realize the “visualization”, “specification” and “simplification” of modern construction management, so that all results more intuitive display of data in the dialog window with visual modeling. It’s good call on a variety of data to guide construction.
Research on the Height of Caving Zone and Roof Classification of Mining Whole Height at One Times in Thick Coal Seam
Authors: Wang Zhi Qiang , Yang Han , Chang Yun Bo , Wang Peng
Published: September 2011

Research on the division of the overlying rock roof of stope has great significance. The existing classification method is based on the determination of existing mining height and loose coefficient , and such studies have been proved exist some limitations in the applications of thick coal seam full coal mining. Theoretical analysis and similarity simulation experiments show that during the mining all height at one times in thick coal seam, as the recovery room increase ,the thickness of immediate roof of the overlying strata which fall with the mining increased signifi-cantly, and the structure of the overlying critical layer to stabilize that is the layer of hypogyny basic roof gradually increased. Through theoretical analysis and summarizing similar simulation experiment phenomenon, based on the definition and characteristics of the immediate roof and main roof, with elastic thin mechanics and the key strata theory as the research foundation, doing scientific classification of mining face's roof in all height at one times in thick coal seam, and combined impact of all factors, which influence the breakage and caving of Basic Roof, to estab-lish a scientific judgment in the length of work face and the pressure of basic roof for practical production relations, provide certain theoretical basis.
Improved Combination GM(1, 1) Model and its Application in Distortion Inspection
Authors: Deng Yong He
Published: September 2011

.It is availability to improve GM(1,1) forecasting precision based on the combination of GM(1,1) model and linear regression.But,it is no good to deal with no-saltation points always based on linear regression,and deal with saltation points based on equidistant GM(1,1) model.So,in the paper，it has definite meaning of theory and practice to advance a new GM(1,1) combination model to solve the problem.Finally some examples are given in the paper.
Failure Analysis on Main Drive System of Tracked Vehicles
Authors: Xue Ming Chen , Wu Jian
Published: September 2011

he failure phenomenon of coupling and universal-joint trunnion had often taken place since they were put in production. The static load strength and fatigue strength of main components were tested and analyzed in the ANSYS software. In order to deal with this failure problem, dynamics and kinematics emulation of drive system without damper was made to find the reason for his failure problem. An improvement program for the drive shafts was put forward. This paper provides theoretical basis for the design and production of tracked vehicles’ drive shafts.
Research on Dynamic Display System of Highway Traffic Incident Information Based on GIS
Authors: Wang Xi Cang , Jiao Pei Gang
Published: September 2011

With the development of domestic highway, people put forward higher and higher requirements for traffic capacity and service quality of the highway. This paper starts with traffic incident information management system functions, researches and develops a traffic incident information management system application platform based on the analysis of geographic information system software application. The feasibility of the system is proved with the valuable practical application and the program is implemented.
Research of Aero-Engine Life Prediction Based on Take-Off EGTM
Authors: Peng Hong Bo , Dan Min , Qu Hong Chu
Published: September 2011

Life prediction is one important of area Engine research. Take-off EGTM is an important parameter to monitor Engine performance. Take-off EGTM have great influence on Engine life, Reducing EGT will help to extend Engine life on wing (LOW), thereby reducing operating costs. Aiming at aero-Engine condition monitoring, the definition of take-off EGT Margin is given, estimation methods and their application on Engine life prediction are discussed.
Fire Performance of CFST, SRC and RC Frames
Authors: Wang Guang Yong , Wang Xing Qiang , Liu Guang Wei , Liu Xiao Yang , Ma Da Fang
Published: September 2011

Failure mechanism and fire resistance comparison of concrete-filled steel tube (CFST) frames, reinforced concrete (RC) frames and steel reinforced concrete (SRC) fames are proposed in this paper when their bearing capacity and rigidity at room temperature are similar. The result shows that the failure mode and failure mechanism of the 3 frame structures are much different, and the SRC frames have the maximum fire resistance.
Temporary Support Design on Large-Span Casting Box Girder of the Songpu Bridge
Authors: Wang Hai Jun , Xue Zhi Cheng , Han Zi Qian
Published: September 2011

By the study of construction of casting box girder of Songpu Bridge in Harbin, and the actual site geology, hydrology and the corresponding norms, this paper designed temporary support with the method of allowable stress. It was proved that the temporary support met the need of the site construction, both to ensure casting construction quality, but also save construction costs and speed up the construction progress, which provided a new way for the construction of large-span continuous box girder.
Evaluation and Performance Prediction for Asphalt Pavement Preventive Conservation Measures
Authors: Yang Yan Hai , Zhang Huai Zhi , Wang Bo
Published: September 2011

Based on the monitoring data of pavement performances and traffic volume from the China key projects, the expressways from Shenyang to Shanhaiguan and from Panjin to Haicheng, the effects of asphalt pavement preventive conservation measures utilized in the two expressways and the remaining equivalent standard loads are evaluated. Three models are adopted to predict the pavement performances for the two expressways in six years by the regressing analysis and the reasonable performance prediction models are accomplished through modifying the initial models by the actual monitoring data.
Based on AHP to Study the Comprehensive Evaluation of Architectural Space's Physical Environment
Authors: Xu Zhong , Fan Xiao Qing , Fan Tao , Gao Yong Tao
Published: September 2011

Architectural physical environment is the most important determined elements of people comfortably using architectural space. This paper firstly analyzes the physical environment's constitution for architectural space; uses analytic hierarchy process(AHP) to establish a kind of comprehensive evaluation model for physical environment of architectural space to divide them into three-level evaluation indexes; then calculated the weight value of each index for scheme layer; at the same time, selects four teaching buildings as evaluation instances and provides the value of each index for physical environment of architectural space by experts' scoring method; at last, weights and composites with the foregoing weigh to obtain the comprehensive scores of each teaching buildings and conducts the comprehensive evaluation.
Analysis on the Generation Operation of the Three Gorges Reservoir during the Experimental Operation Period
Authors: Ji Chang Ming , Pei Zhe Yi , Zhang Yan Ke , Zhou Ting
Published: September 2011

The operation of the Three Gorges power station is of the most complex feature in China and even in the world, for it involves many factors such as flood control, power generation, shipping and water supply. This paper takes the experimental reservoir impoundment in 2008 for example, demonstrated its impact on power grid operation, meanwhile, put forward suggestions on impoundment time, impoundment target, impoundment and fluctuating process and adjusting mechanism building, etc.
Review on Public Transportation System in Tehran City
Authors: Ebrahimi Hamid Reza , Pourheidari Soheila , Zivari Sima , Yavari Amir
Published: September 2011

With respect to population growth, particularly in developing countries like Iran, this trend has caused people to use personal vehicles more than ever so that application of personal vehicles is more than predicted traffic capacity and potential in towns and megalopolises. This has created several traffic and environmental problems and casualties and financial losses in urban community. For some period of time, the experts and specialists in the field of traffic and urban administration are thinking about some alternative solutions to resolve these problems. One of such alternatives to substitute with using personal vehicle is establishment, development and renovation of public transportation system in all dimensions of megalopolises. At the present essay, it has been tried to explore into public transportation system of Tehran City as one megalopolis and with respect to planning objectives of public transportation in Tehran City, we will deal with the problems and difficulties which this plan is faced by them and eventually by purposing some solutions including optimization of system capacity and accessibility to network, reducing trip time and presentation of some strategies to improve mental imagination of public in using public transportation, we have contributed to create an integrated, efficient and reliable public transportation system.
Effect of Local Damage on the Performance of Structures
Authors: Xu Jun Xiang , Zhang Lan Chun
Published: September 2011

Abstract. The dynamic behavior of structure subjected to local damage is investigated using conceptional removal methods recommended in the General Services Administration (GSA) guidelines. Two types of local damage are considered, namely, the speed and location of failure. The study is conducted on designed seven-story prototype buildings by applying dynamic liner analysis. Based on the simulation, it is concluded that dynamic effects are important considerations properly representing structural behavior in a robustness analysis of structure. The results also show that corner column play more important role in prevention of structural collapse than interior column. The resulting information would be valuable for protecting structures.
Discuss the Loss of Traditional Culture in Modern Architecture
Authors: Liu Qiang , Shi Nan , Chang Jiang
Published: September 2011

Foreign trends are fashionable in contemporary Chinese architecture, foreign cutting-edge architecture ideas and international styles wantonly invade, making more and more national landmark buildings possess foreign appearances, and architectural images are becoming more eye-catching, while ethnic, regional features contained in buildings get lost gradually. Based on the comprehensive analysis of positive and negative examples of construction, this paper tries to find the best conjunction point between traditional culture and modern architecture.
Study on Sulfate Resistance of Concrete with Compound Mineral Admixture
Authors: Yang Qian Rong , Wang Xiao Qian , Ji Hui
Published: September 2011

The strength, expansion and amount of scaling of concrete with compound mineral admixture (CMA) from steel slag, granulated blast furnace slag and fly ash were studied. The result shows that damage by crystallization press from sulfate attack when concrete was exposed to sulfate environments under wetting–drying alternation is much larger than that from sulfate chemical attack. Adding CMA to concrete could reduce the damage from expansion of concrete caused by sulfate chemical attack, but the resistance of concrete to damage by crystallization press from sulfate attack was remarkably reduced.
The Unified Formula of the Calculation of Flexural Members Strengthened
Authors: Li Yan He , Ren Sheng Yuan , Yi Bo
Published: September 2011

In this paper, the concept of "the amount of bending reinforcement" is introduced, the unified formula of the calculation of flexural members strengthened by selecting the axis of a reasonable balance is obtained, a way of explicit calculation is found. the concept of formula of the calculation of flexural members strengthened is clear and the calculation is simple.
Modelling Long-Term Bridge Deterioration at Structural Member Level Using Artificial Intelligence Techniques
Authors: Lee Jae Ho , Guan Hong , Loo Yew Chaye , Blumenstein Michael , Wang Xin Ping
Published: September 2011

Efficient use of public funds for structural integrity of bridge networks requires an effective bridge asset management technology. To achieve this, a reliable deterioration model is essential in any Bridge Management System (BMS). The deterioration rate is calculated based on historical condition ratings obtained from the structural element-level bridge inspections. Although most bridge authorities have previously conducted inspection and maintenance tasks, these past inspection records are incompatible with what are required by a typical BMS as input. Such incompatibility is a major cause for the deficiency of the current BMS outcomes. Artificial Intelligence (AI)-based bridge deterioration model has recently been developed to minimise uncertainties in predicting deterioration of structural bridge members (e.g. beams, piers etc). This model contains two components: (1) using Neural Network-based Backward Prediction Model (BPM) to generate unavailable historical condition ratings; and (2) using Time Delay Neural Network (TDNN) to perform long-term performance prediction of bridge structural members. However new problems have emerged in the process of TDNN prediction. This is because the BPM-generated condition ratings are used together with the actual condition ratings. The incompatibility between the two sets of data produces unreliable prediction outcomes during the TDNN process. This research is thus to develop a new process based on the existing method, thereby overcoming the abovementioned problems. To achieve this, the actual overall condition ratings are replaced by the BPM forward predicted condition ratings. Consequently, the outcome of this study can improve accuracy of long-term bridge deterioration prediction.
The due Changes of Urban Planning in China: Reflections on an Event of Sanitation Facilities Construction
Authors: Wang Lin Shen , Yuan Yun , Hu Ming , Pan Kun , Ni Jian Bo , Liu Qiang
Published: September 2011

The government want construct garbage transfer station near one residential area, they had to stop construct since the residents resisted, the urban planning need responsible the problem. There are necessary to make the following changes: to emphasis the “public welfare” of basic public facilities and practicability of urban planning; to do research in the protection of such facilities, make the green space system and alliance planning; through improving many methods to improve the schedule management, such as monitoring and feedback of construction, short-term assignments rolling implementation, "construction controllers" training and similar as the first- approval responsibility for patient, etc; to push public prior participation through BBS, public adjustment, community activities and electronic media, to promote the preparation of well-organized system using atmosphere of cooperation, shared responsibility system, contact agencies and volunteer; extension of the trend of planning paradigm to “experience-oriented planning”, set up the renovation of humanism in urban planning field.
A Construction of Landscape Evaluation Indicator System for the Urban Comprehensive Park Based on the Theory about Three Elements
Authors: Li Hui Min , Jin Yan Ming
Published: September 2011

In order to evaluate landscape of the urban comprehensive park scientifically, landscape elements of the comprehensive park were analyzed by using the landscape theory about three elements. Landscape evaluation indicators were chose preliminarily from three aspects- aesthetics, ecological environment and function, and were filtered and optimized by probability statistics analyzing survey data to experts and the public. Landscape evaluation indicator system for the urban comprehensive park was constructed, which could provide base for Landscape evaluation.
Ranking of Strategic Management Indicators in Improvement of Urban Management by Using Multiple Attribute Decision Method of TOPSIS
Authors: Moghaddam M. R. Sadeghi , Yavari Amir , Ghariblu F , Anbari Y
Published: September 2011

Planning, investment and city management have been surprisingly become so complex and difficult because of the massive growth of cities and the dual role they play. Not only Complexity and importance of the problem are facing planners to this reality but also make them to quit outdated methods of urban management, and accept new ideas and updated methods. In this study, urban development strategy was considered by emphasizing on public participation, local government power and urban vision. Because urban vision is an ideal situation which society hopes to achieve in future. Certainly one of the most important goals of this project was citizen’s welfare. Thus we tried to explain and define these criteria’s such as development strategy plan and urban management. At the end the existing approaches has been evaluated by considering urban approaches as parallel options and determining its basic indicators and their efficiency. By considering existing approaches as a multi- dimensional approach, the multi- dimensional decision method like TOPSIS method has been used and consequently existing application ranked generally and since our country is developing so this could be an efficient step to the self- help of the cities.
Performance Language of Glass in Architecture Designing
Authors: Chu Yan , Lv Jing Qing , Zhou Tong
Published: September 2011

The paper summarizes seven typical moods of the application of glass as a performance material in architecture designing with examples. It points out that glass is not only function material but also performance material in architecture. It also provides a new thought to deal with the glass in architecture designing.
Cultural Town: Small Town Planning and Construction Based on Mongolian and Yuan Culture
Authors: Liu Da Peng , Wang Hong Wei
Published: September 2011

Mongolian and Yuan culture is the culture system which is interactive with original nomadic culture and ZhongYuan farming culture forming, whose elements, symbols and connotation is used effectively in planning and construction of small towns is reflected in the display with a town image and the key point of a town charm objectively. It is necessary to analysis the relation with the Mongolian and Yuan cultural elements and small towns as an opportunity to plan and construct the small towns of Mongolian and Yuan culture. This is the latest annotation to cultural town, and it is the language and way to express of the characteristics in small towns.
City Context Character in Information Society
Authors: Li Gang , Cao Jian Zhou
Published: September 2011

According to characteristic of city context and information society, in this paper, City context character in information society is put forward. City context design in information society include the blending between a part and the whole; the blending between the internal and the external; the blending between the urban and the environmental; the blending between the different cultures.; the blending between the history and the present; the blending between the technique and man. we suppose city context new annotation、new ideas、new development in information society.
Study on the Regulatory Detailed Planning in Mountainous Cities
Authors: Wang Zheng , Zheng Tao , Xiong Juan
Published: September 2011

Chongqing is a typical mountainous city and favorable exploration has been made with respect to the preparation of the regulatory detailed planning through decades of urban planning and construction. In combination with the experience of Chongqing, the planning method is discussed on the actuality of the land under investigation and analysis, the protection and creation of the landscape features, the establishment of the harmonious relations between human and city as well as nature in respect of the actuality investigation & analysis and the planning layout exploration.
Research on Integration of Modern Urban Street Space with Underground Space
Authors: Zhao Jing Wei , Fu Hou Li
Published: September 2011

The further development and utilization of underground space resources by human effectively integrate urban space with underground space and win high space scale benefits. As an important form of urban public space, street space undertakes complex urban functions, which is placed as the priority of urban design. This paper studies deeply the development and integration of two street space forms, i.e. underground space and street and road space, to explore effective utilization mode of modern urban space.
Seeking Feasible Low-Carbon Residential Design Strategies According to the Energy Consuming Sources of the Residential Construction
Authors: Liu Chao Ying
Published: September 2011

According to Xuanmei Yang and other scholars’ study, space heating and cooling together with water heating consist the majority of domestic energy consumption. This article analyzes the seven aspects of domestic energy consumption by heating or cooling. From the building envelope technology and low-carbon technology aspects, it provides numbers of feasible strategies to attain low-carbon residential design adapting to the energy consuming sources of the residential construction.
Research on Dual Buck Half Bridge Five-Level Inverter for Rooftop Solar System
Authors: Ji Bao Jian , Hong Feng , Ge Wen Jing , Yang Wei
Published: September 2011

This paper presents a novel design for dual buck half bridge five-level inverter (DBHBFLI), which based on field-programmable gate array (FPGA), and was used for photovoltaic power system. This topology is derived from dual buck half bridge inverter (DBHBI), which has the characteristics of no shoot-through problem, no body diode reverse-recovery problem, and current half-period work mode, these merits are retained in the proposed inverter. FPGA logic device is chosen for the hardware implementation of control circuit. The FPGA controller consists of six main modules: the sine wave generator module, the triangle wave generator module, the voltage proportion integration (PI) module, the current proportion (P) module, sinusoidal pulse width modulation (SPWM) module, and SPWM distribution module. VHDL is used in the design of each module. The simulation and experiment results which confirm the validity and performance of the design are shown in the paper.
Evaluation on Leading Product of Energy Saving Wall Material
Authors: Ni Tie Quan , Wang Shu Ying , Wang Hao
Published: September 2011

With the rapid development of new wall material in recent ten years, it is difficult to select the reasonable product. In order to guide the healthy and orderly development of energy saving wall material, all kinds of wall material are analyzed comprehensively basing on the various possible indexes which affect the performance of wall material. By evaluating, the leading product of energy saving wall material is obtained.
Eco-Friendly Vernacular Rural Housing in Western China: a Case Study of a Reconstruction Project after 2008 Sichuan Earthquake
Authors: Cheng Hui , Liu Jia Ping , Wang David , Zhou Wei , Hu Rong Rong , Liu Da Long
Published: September 2011

In the rapid urbanization of rural western China, a variety of long-standing housing typologies are being replaced with energy consuming brick-concrete structures that have little connection to vernacular traditions. To improve this situation, this paper proposes an ecologically sensitive alternative, based on a case study of the design and construction of 44 new dwellings in Daping Village, Sichuan Province, after that area was devastated by the May 12, 2008 earthquake. We propose that this eco-approach may represent a generalizable approach for sustainable development of vernacular architecture in western China.
Research of the British Residential Building Designs and Energy Conservation
Authors: Wang Liang
Published: September 2011

As the British has a cold and rainy climate, which is variability, its relatively high energy efficiency standards has been set up. Energy efficient building in the United Kingdom in the technical measures three main areas: 1) use of structural measures to raise the walls, roof and windows of the thermal insulation properties; 2) the use of solar energy; 3) improving the heating system. Currently the United Kingdom to promote passive solar house without external mechanical action, heat-absorbing insulation materials of construction for the media, the use of natural cold and hot air exchange, to the use of solar energy.
Study on Temperature Field and Thermal Stress for an Insulated Composite Wall
Authors: Mei Fu Liang , Li Gui Ling
Published: September 2011

In this dissertation, the mathematical models of thermal conduction procedure and thermal deformation for an insulated composite wall are established. That thermal conduction model takes complicately environmental changes (such as solar radiation, building self-radiation, reflecting ground radiation, air temperature, outdoor heat convection and indoor heat convection) into account. The thermal conduction problem is solved using finite difference method on spatial domain and DIPIM on time domain respectively. Computational formulae of thermal stress are deduced based on theory of thermal elasticity and plane section assumption. Finally, both the hourly temperature field and the thermal stress for an exteriorly and an interiorly insulated composite wall within a typical day of winter and summer are analyzed. Computational results show although the exterior insulation system is more beneficial to the stability of primary wall than interior one, the effect of environmental changes on mortar cracking and decorative materials inside the exteriorly insulated system than that inside the interiorly insulated system. The temperature gradient inside the insulated lamination is bigger than that in other laminations for any insulated system within whether winter or summer. In addition, the temperature gradient inside the insulated lamination for the interiorly insulated system within winter is bigger than that within summer, but the temperature gradient inside the insulated lamination for the interiorly insulated system within summer is bigger than that within winter. Although the exteriorly insulated system is more beneficial to the stability of primary wall than the interiorly insulated, the effect of environmental changes on mortar cracking and decorative materials for the exteriorly insulated system is bigger than that for the interiorly insulated. An exteriorly insulated system is more beneficial to the primary wall than an interiorly insulated system according to environmental attacks on the primary wall.
Chemical Corrosion Resistance of Concrete with Mineral Admixture Slurry in Artificial Seawater
Authors: Su Ying , Zhu Wan Fa , Ding Wen , He Xing Yang
Published: September 2011

A series of mineral admixture slurry with different fineness was manufactured by means of wet-milling with stirring mill. The effect of mineral admixture treated by dry milling and wet milling on chemical corrosion resistance of concrete in artificial seawater was investigated in this paper. Results showed that, the chemical corrosion resistance of concrete with fly ash and original fly ash treated by different grinding mode is improved, and the chemical corrosion resistance of concrete with slag is relatively inferior. The compound of fly ash and slag can evidently improve the weakness of slag concrete that has poor chemical resistance.
Experimental Study on Impact Resistance of CaCO3 Whisker-Reinforced Cement Mortar
Authors: Cao Ming Li , Yao Hang , Cui Shi Cai
Published: September 2011

CaCO3 whiskers were incorporated into the cement mortar in this study and the effects of whiskers on the impact resistance of mortar were investigated. The results showed that CaCO3 whiskers could improve the impact resistance of cement mortar before initial cracking. When the whisker content was 10%, the reinforcing effect was optimal. But after initial cracking, the capacity of matrix to resist further impact load was not improved significantly. By observing the failure modes of specimens, it was shown that the crack branches of whisker-reinforced cement mortar were increased, which indicated the brittleness of matrix was decreased and the toughness was improved to some extent. In addition, the reinforcing mechanisms of CaCO3 whiskers in the cement mortar were also discussed
Cation Migration in Mortar with Different Volume Fractions of Aggregate Affected by Electric Field
Authors: Kuo Wen Ten , Liu Chih Chien , Wang Wei Chien
Published: September 2011

This study used Type I Portland cement with Na2Oeq of 0.67% to fabricate a mortar specimen with w/c ratio of 0.5 and a dimension of φ10  3 cm. The 7 volume fractions of aggregate (Vf) were adjusted to 0, 10, 20, 30, 40, 50 and 60%, and Acceleration Lithium Migration Technique (ALMT) experiments with 9 A/m2 constant current density were performed. The results show that for specimen with Vf of 10%, the negative effects on ion migration generated by aggregate dilution and tortuosity effects were the greatest; therefore, the removal times of Na + and K+, the time it took for Li+ to pass through the specimen and the time for Li+ to reach steady state were all longer than in the other experiments. When Vf was increased to 20 and 30%, the negative effect from the dilution and the tortuosity effects generated by the increase in Vf was cancelled the positive effect from ITZ on ion migration. When Vf was increased to over 30%, the percolation effect from ITZ controlled the behavior of ion migration. During the ALMT experiment, the anode steadily produced a large amount of O2, while the cathode produced a small amount of H2.
Experimental Study on Mechanical Properties of Axially Loaded PVC Tubed Short Concrete Columns
Authors: Dong Jun , Chen De Ping , Zhao Ju Mei , Shan De Shan , Liu Xin Yue , Liu Gang
Published: September 2011

Twelve PVC tubed short concrete columns and four columns without PVC tube confined were tested under axial load to investigate mechanical properties of axially loaded PVC tubed short concrete columns . The principal influencing factors such as concrete strength, loading condition and ratio of height to diameter were studied. Test results indicated that strength and deformation performance of core concrete increased as a result of the confinement of PVC tube. The PVC tube confinement effect on concrete will decrease with an increase in strength of concrete. Load- carrying capacity and deformation of short composite columns with different loading condition made some difference. As the ratio of height to diameter increases, load- carrying capacity and plasticity of short composite columns decreased gradually.
Experimental Study on the Effects of Addition of Excessive Volume of Fly Ash on Concrete Properties
Authors: Quan Hong Zhu , Kasami Hideo
Published: September 2011

This paper presents the results of experimental study on the effects of addition of excessive volume of fly ash on the strength characteristics of concrete. Crushed stone aggregate concrete with the replacement ratio of fly ash to Portland cement of 0, 10%, 20%, 30%, 40%, 60% and 80% were tested for compressive strength and modulus of elasticity at the ages of 7 days, 28 days and 91 days. The test result indicated significant reduction in compressive strength with the increase of fly ash content, indication 90% reduction at 80% fly ash replacement. Reduction in modulus of elasticity was found to be less than those of compressive strength, indicating 60% reduction at 80% fly ash replacement.
Effect of Mineral Admixtures and Water/Binder Ratios on the Resistance to the Chloride Ions Penetration into Concrete
Authors: Hu Yan Jun , Du Yan Liang
Published: September 2011

In this study, concrete prisms were made with three mineral admixtures: fly ash, blast furnace slag or silica fume and with three water-to-binder ratios(w/b). Chloride penetration was measured by the rapid chloride permeability test (RCPT)-ASTM C1202, 150-days ponding test and alternate wetting and drying test by cyclic loading with salt solution and oven drying, and the results by the three test methods were compared. This paper discussed the effects of mineral admixtures and w/b on the concrete chloride permeability. Blending concrete with blast furnace slag, fly ash or silica fume was beneficial with regard to the resistance against chloride ion penetration. Concrete specimens with lower w/b showed lower chloride permeability.
Study on Thermal Dilation Coefficient of Fiber Concrete at early Stage
Authors: Lei Yun Bo , Cao Xue Juan
Published: September 2011

The addition of fiber into concrete can not only suppress the interior shrinkage strain and decrease the thermal dilation coefficient (TDC) of concrete, but also it can lessen the width of shrinkage crack, especially reduce the appearance of interconnected pore, thus the reduction of the water content of capillary pore will make the TDC of paste matrix lessen. In this paper, an experiment was designed to study the TDC from the 5th day to the 29th day after the concrete was poured. The results show that the addition of fiber can effectively reduce the TDC of concrete. When the addition is the same, high-modulus carbon fiber reinforced concrete has a lower TDC than low-modulus polyester fiber concrete.
Research on Saving Energy and Reducing Cost of the Higher Learning Institution
Authors: Wang Qing Yu
Published: September 2011

The work of energy saving in the Institution of higher learning was analyzed in the research, and the problems facing higher education on energy consumption were analysed. These measures were proposed that establishing lead agency, strengthening energy conservation regulation, conforming resources efficiently, optimizing resources and facilities, strengthening the publicity of saving, establishing energy-saving habits, detailing day to day management, reducing energy consumption effectively. Through the above measures, speeding up the process of energy saving higher education.
The Additive of Concrete Material Study on the Impact of the Anti-Permeability
Authors: Wang Li Mei , Liang Jun
Published: September 2011

Through experiments, in concrete reasonable use efficient jianshuiji, fly ash and slag powders and adding mixed materials thereof after the concrete can be greatly increased the anti-permeability and improve the durability of concrete.
Research on the Treatment for Water Damage to Widened Subgrade of Collapsible Loess Based on Centrifuge
Authors: Weng Xiao Lin , Zhang Liu Jun , Wang Wei
Published: September 2011

A centrifugal earth structure deformation test system has been developed to study the mechanism and pattern of subgrade damage as caused by water wetting to the widened roads in collapsible loess areas. It incorporates an upgraded electric sensor logging system and a centrifugal field image pickup system and provides a centrifuge model test platform for both the new road and the original road that are subject to water wetting and infiltration. A centrifuge test model on which actual stress distribution can be simulated was set up to study the forms of water damage to the widened subgrade. In the same time, special research was conducted with regard to the working mechanism of geogrid in the splice between the new road and the old, as well as the effect of dynamic compaction on loess foundation. It indicates that high water content in the toe of slope of a widened road could significantly influence the stability of subgrade. Local instability in loess foundation, as caused by the presence of high level of underground water especially after a heavy rain, could be a great threat to the integrity and safety of the subgrade on top of it. In this case the loess foundation, which is locally wetted and softened by water, would undergo a reduction in shearing strength and gradually lose its stability under the load of subgrade, that eventually results in the sliding or separation between the new subgrade and the old. The reinforced materials used in the splice can enhance soil hardening and help establish soil arching effect under which the settlement of subgrade is well controlled.
Anti-Seismic Analysis of Masonry-Reinforced Concrete Structure Based on LS-DYNA
Authors: Liu Xiao Bin , Chen Guo Ping
Published: September 2011

composite structure of masonry wall and reinforced concrete wall as A new type of structure, With masonry structure is adopted for the subject, Proper Settings of reinforced concrete shear wall part of combined structure system, It mainly by shear deformation of masonry and bending deformation of reinforced concrete shear wall is mainly composed LS-DYNA, software of finite element, is used to study the structure, simulations of the response procedures of composite structure under earthquake load are made, as well as the destruction of composite structure. According to calculation and analysis, it can be known that this kind of composite structure can obviously improve seismic resistant capability, and the level of destruction is relative smaller, which can meet the requirements for fortification against earthquake that is "keeping intact in minor earthquakes, repairable in medium earthquakes, standing upright in major earthquakes"
Determination of Compacting Temperatures of Rubberized Asphalt Mixtures Containing Warm Mix Asphalt Additives
Authors: Cao Wei Dong , Liu Shu Tang , Cui Xin Zhuang
Published: September 2011

To determine the compacting temperatures of rubberized asphalt (RA) mixtures containing warm mix asphalt (WMA) additives, a total of three RA binders were produced in laboratory using two kinds of WMA additives (Sasobit and CW), and one control binder without WMA additive. Brook rotational viscosity test of RA binders and Marshall compaction test of RA mixtures at various temperatures were conduced to study the viscosity-temperature properties of RA binders with WMA additives and analyze the volumetric properties of RA mixtures with different compacting temperatures, respectively. The results indicate that both Sasobit and CW can decline viscosity at testing temperatures and the compacting temperatures of RA mixes containing CW and Sasobit are 160°C and 154°C, respectively.
Application of High Density Polyethylene Pipe (HDPE) in Same Floor Drainage System
Authors: Tang Jie , Xu Ping Ping
Published: September 2011

This paper analyses the technology characteristics of HDPE pipes and UPVC pipes that used in drainage. Using a residential building project in Hangzhou as an example, it compares the economic benefits and comprehensive benefits of HDPE pipes with those of UPVC pipes. It concludes that it’s better to use HDPE pipes in same floor drainage system, and the using of HDPE pipes will bring benefits in the promoting of the same floor drainage system.
Development of an Vehicular Test System on Vehicle NOx Emission and Fuel Consumption
Authors: Liu Jun , Shi Xiao Peng , Dong Jing Jing , Wang Hui Zhong , Yang Hao Ming
Published: September 2011

This paper introduced the test system which can record and process the related condition parameter considering the needs of international vehicle emission (IVE) model. In order to improve its extendibility and versatility, gasoline vehicle fuel consumption measurement model based on carbon balance method was established. Theoretical model of calculating nitrogen oxides (NOx) emission and fuel consumption by carbon balance method is illustrated. And to measure the exhaust gas flow rate, a V-cone flow-meter and a gas analyzer which were modularized were designed, too.
Influence of the pH of Comb-Shaped Polymer Solutions on the Adsorption Between the Polymer and SO42- Ions
Authors: Duan Guo Rong , Huang Guo Hong , Wang Xin , Gong Ying
Published: September 2011

Comb-shaped hyper-branched polycarboxylate polymers, both water-reducing-type admixtures (applied in cement, symbol of JS) and slump-retaining-type admixtures (applied in cement, symbol of BT), were prepared, and their adsorption characteristics with SO42- ions were studied by conductivity loss experiments. The results indicated that both JS and BT generate electrical conductivity losses in Na2SO4 aqueous solutions, suggesting that there was some interaction adsorption between the SO42- ions and the polymer. The adsorption was closely related to the pH of the sample solutions and occurred due to the strong interactions between the carboxylic acid groups in the polymer backbones and SO42- ions (rather than Na+ ions). However, there was an extremely weak electrostatic adsorptive interaction between the SO42- ions and the long polyether side-chain.
Properties and Safety Management about LNG Carrier
Authors: Jiao Zhan Li , Jiang Chun Xia
Published: September 2011

Due to the special chemical and physical properties of the LNG, there are some safety risks in LNG transportation. Maritime transportation is the key link of LNG transportation, the safety of which even more directly has impact on the healthy development of LNG transportation. In accordance with the safety management system of “human – machine – environment - control”, the hidden risks linked to the safety management of LNG ship are analyzed in different aspects such as cargo property, ship factors, environment factors, human factors and management factors respectively; Combined the home and abroad rules about LNG, the impact and requirement to safety management to LNG are discussed, too. Then, polices and methods are given responding to the above noticed factors.
Research on the Microscopic Characterization of Preparing Alpha-Hemi Hydrate Gypsum from FGD Gypsum at Atmospheric Pressure
Authors: Zhang Yun , Li Xiao Fei , Yin Wen Xuan
Published: September 2011

The condition of preparing α-hemi hydrate gypsum from FGD gypsum at atmospheric pressure is easy to achieve. It acquires atmospheric pressure and low heating temperature. This paper introduces two different methods of preparing α-hemi hydrate gypsum, aqueous salt solution method and dry dehydration. Use the microscopic characterization of α-hemi hydrate gypsum to identify the product. Observe the crystal of product by stereo microscope and characterize the compounds with Fourier transforms infrared spectroscopy. Investigate the factors’ effects between the two methods.
Mechanical Properties on Thermosetting Epoxy Asphalt Waterproof Bond Material for Cement Concrete Pavement Based on Composite Structures
Authors: Qian Zhen Dong , Wang Ya Qi , Song Xin
Published: September 2011

One of the important methods to ensure the durability of cement concrete pavement is utilizing excellent waterproof bond layer. Firstly, based on the mechanism of strength of the thermosetting epoxy asphalt waterproof bond material (EAWBM), the construction temperature which is strictly controlled above 130°C, is insured. Then the amount, the curing time and temperature of the thermosetting epoxy asphalt, are studied as the influencing factors of mechanical properties based on the composite structures of the concrete cement pavement. Finally, through the three-point bending fatigue test of composite structures, the fatigue durability of different waterproof bond material is compared. The results show that: the optimal amount of the thermosetting epoxy asphalt is 0.60~0.80L/m2; the asphalt concrete paving must be carried out within 24~32h after the EAWBM is constructed; the mechanical properties of the material decreases as the increasing test temperature; the waterproof bond materials have greater impact on the fatigue durability for the composite structures of the concrete cement pavement compared with the paving material, and the fatigue durability of the EAWBM is the optimal selection for cement concrete pavement.