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Numerical Simulation on Chloride Ions Diffusion in Concrete Qing Wang 1,2,a, Gang Xu 2,b, Jun Wei1,c 1School of Civil Engineering＆Architecture, Central South University, Changsha, Hunan, 410075, China 2 College of Civil Engineering＆Architecture, China Three Gorges University, Yichang, Hubei, 443002, China apostwq@163.com, bpostxg@163.com, cjuneweii@163.com Keywords: Chloride diffusion, Numerical simulation, thermal analysis, Fick’s second diffusion law Abstract.
Acknowledgement This work is supported by Major Scientific and Technical Project of Ministry of Railway (No. 2008G031-18), Open Foundation of National Engineering Laboratory for High Speed Railway Construction and the Key Scientific Research Project of Hubei Education Department of China (No.
Vol. 34(2004), p. 7(In Chinese) [5] X.Q.Meng: Engineering Journal of Wuhan University.

Comparison of Multiple Freeze-Thaw Cycles of High-Performance Concrete Test Beams and Concrete Beams Loaded Test Zhiqiang Li1,a, xianchun zheng1,b, Xiaohong Cong1,c 1 Dept of Civil Engineering, Hebei Institute of Architecture and Civil Engineering, Zhangjiakou, 075024, China alizq_369@sina.com, bzjkjyzxc@163.com , cgwb.xiao@163.com Keywords: HPC;Basalt fiber cement mortar; Freeze-thaw cycles Abstract.This study focuses on the following: analysis of the basic mechanical properties of freeze-thaw cycles BFRP composite; freeze-thaw cycle on BFRP reinforced concrete structures force performance; provide experimental basis for the the basalt FRP freeze-thaw environment concrete structure andtheoretical support.
It can be concluded, the use of basalt fiber can be improved to some extent the bending stiffness of the component; can also be seen that the use of basalt fiber will reduce the ductility of components, basalt fiber reinforcement for reinforced concrete beams, should be adopted according to specific engineering reasonable; freezing and thawing will reduce the stiffness of the test beam and crack, the deflection of the resulting increase in the need to be vigilant, design attention.
[2] Conrad H,Sprecher A F,The Electro plastic Effect in Matters,in Naborro FRN.Dislocations in Solids Amsterdam:Elsevier, (1989) 1~32 [3] Dry Carolyn.Crack and damage assessment in concrete and polymer matrices using liquids released internally from hollow optical fiber[J].Proceedings of SPIE-The International Society for Optical Engineering,(1996) 20~30 in Chinese.

An Efficient Calculation Method for Seismic Spectral Analysis under Multiple Support Excitations Jin Guoa and Junjie Wangb The State Key Laboratory for Disaster Redaction of Civil Engineering, Tongji University, Shanghai 200092, China a mofon921@126.com, b jqxu@126.com Keywords: spectral analysis; correlation coefficients; spatial coherence; random response; multiple support excitations.
The computation of the three coefficients is time-consuming by their original definitions, so the further use of response spectral analysis method for structures under multi-support excitations is unacceptable for civil engineers.
Neurenhofer, Response spectrum method for multi-support seismic excitation, Earthquake Engineering & Structural Dynamics, 21 (1992) 713-740
Jiang, Stochastic response of arch bridges under multiple support excitation, Journal of Vibration Engineering, Vol.8 2 (1995) 25-33
Ku, An efficient analysis of structural response for multiple-support seismic excitations, Engineering Structures, Vol. 17 1 (1995) 15-26

Predicting Model of Safe Distance Between Tunnel and Karst Cave Yongbiao Lai 1,2, a, Mengshu Wang 1,b and Chenguang Bai 2,c 1 College of Civil Architecture and Engineering, Beijing Jiaotong University, Beijing 100044, China 2 China State Construction Engineering Corporation Technical Center, Beijing 101300, China alyb3258@126.com, bdxgc@sina.com, cbaichenguang@cscec.com Keywords: Concealed Karst Cave, Safe Distance, predicting model, support vector machine.
Introduction How to properly determine the safe distance between tunnel and karst cave is a synthesis civil engineering problem relating to the engineering cost, execution and operation.
In fact, the reasonable safety distance should be determined by synthetically considering the various factors based on the nature of the geotechnical engineering, engineering geological conditions, the specific conditions and construction method etc.
Many other engineering examples also proved the feasibility of the prediction model of safe distance between tunnel and karst cave having been built above, See the reference 7.
Forecasting model of safe cover thickness of tunnel crossing Songhua River in Harbin[J]．Chinese Journal of Rock Mechanics and Engineering.Vol.22(2003)：p.849—854

Key Construction Technology for Highway on Soft Foundation Yang Lin1， YaBo He2 1,2 Department of Construction Management, School of Civil Engineering, WuHan University, Wuhan, Hubei (stephaniesky@163.com) Keywords: Soft foundation, highway, development status, technology trends, key construction technology, empirical study Abstract.
This paper analysis common engineering problems on soft foundation and the development status for soft soil treatment technology, then build up the technology trends on it.
Theoretical Backgrounds Common engineering problems on Soft Foundation Soft soil has the characteristics such as soft pine, void ratio, the natural high water content, high compressibility, low strength, permeability and structural sensitivity of small.
The development status for soft soil treatment technology Soft subgrade treatment is a very practical design and construction engineering technology, its technical condition is complex, the impact on many factors, and site engineering geological conditions, hydrogeological conditions, construction requirements are closely related, while the foundation treatment should also attach importance to environmental protection.
Of Civil Eng.

Study on the Selection of Subcontractors Based on Fuzzy Comprehensive Evaluation Feng Yu1, a, Bin Kang2, b 1School of Civil Engineering and Architecture, Wuhan University of Technology, Hubei Wuhan, 430070, China 2School of Civil Engineering and Architecture, Wuhan University of Technology, Hubei Wuhan, 430070, China a1988yufeng@sina.com, bkangbin2008@163.com Keywords: Construction subcontractor, Selection progress, Fuzzy Comprehensive Evaluation, The evaluation factors set.
Introduction Overall engineering contracting mode depend on its owners´tendencies, allocation of resources, comprehensive benefits, development trends and many other advantages.
Subcontractors subcontracting engineering quotation level have a significant impact on the choice of general contractor.
In recent years the subcontractors similar engineering experience involve the choices of general contractor.
Engineering Case A general contractor wants to subcontract his large-scale bridge engineering’s landscaping projects.

3D Simulation of Tunnel Collapse Consolidation and In-situ Monitoring Analysis Zhimin Chen1, 2, a and De-an Zhao 2, 3, b 1Key Laboratory of Road ＆ Bridge and Underground Engineering of Gansu Province, Lanzhou, Gansu 730070, China; 2School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China; 3School of Civil Engineering, Northwest University for Nationalities, Lanzhou, Gansu 730030, China; achenzhimin0523@126.com, bzhao_da@mail.lzjtu.cn Keywords: Tunnel Collapse; Finite Difference Simulation; Consolidation Scheme; In-Situ Monitoring Abstract: A shallow buried tunnel was collapsed during construction.
This could be referenced for similar engineering.
Engineering practice shows that the forms of tunnel collapses are different under different conditions because of different influence factors.
There are many engineering examples[5-6] of collapse consolidation at domestic and abroad, but the majority is based on experience.
RAILWAY ENGINEERING, 1998, (2): 28－30.

The Influence of Geopolymerization Process on Liquid and Plastic Limits of Soils Sharifah Zaliha Syed Zuber1, a, Mohd Mustafa Al Bakri Abdullah1, b, Kamarudin Hussin1, c, Fauziah Ahmad3, d, Mohammed Binhussain4,e 1 Center of Excellence Geopolymer and Green Technology (CEGeoGTech), School of Material Engineering, University Malaysia Perlis (UniMAP), P.O Box 77, d/a PejabatPosBesar, 01000 Kangar, Perlis, Malaysia. 2Faculty of Engineering Technology, Universiti Malaysia Perlis (UniMAP), P.O.
Box 77, D/A Pejabat Pos Besar, Kangar, Perlis 01000, Malaysia 3School of Civil Engineering, UniversitiSains Malaysia, Engineering Campus, 14300 NibongTebal, SeberangPerai Selatan, Pulau Pinang. 4King Abdulaziz City Science and Technology, P.O.
High liquid limit could lead to various problems in engineering field; (1) high natural water content, (2) low strength (CBR value) and (3) poor water stability [6].
Even though geopolymerization process of geopolymer is complex and still not fully understood [10], the finding of new applications by using this process is still going on since it was found to have potential to be used for construction engineering, fire proof, biomaterials, waste treatment, etc [11].
[12] British Standard: BS 1377-2:1990, Methods of test for soils for civil engineering purposes - Part 2: Classification tests, (1990).

Research on Deflection Calculation of Laminated Glass Simply Supported on Four Sides Xun Wang1, a, Qilin Zhang1,b, Jun Chen2,c, Zhixiong Tao1,d and Jun Chen3,e 1School of Civil Engineering, Tongji University, Shanghai, 200092, China 2China Airport Construction Group Corporation of CAAC, Beijing, 110101, China 3East China Architectural Design & Research Institute Co., Ltd, Shanghai, 200092, China awangxun_wx@sina.com, bzhangqilin@mail.tongji.edu.cn, c314648438@qq.com, dzhixiongtao@163.com, ecj9104@ecadi.com Keywords: Laminated glass, Load bearing capacity, Experimental research, Numerical simulation.
Other parameters are the same with “Technical code for glass curtain wall engineering” in China.
Acknowledgements This work was financially supported by the National Natural Science Foundation of China (Grant No. 50978195), and Kwang-Hua Fund for College of Civil Engineering, Tongji University.
Technical code for glass curtain wall engineering.
Ansys numerical analysis for engineering structure Beingjing: China Communications Press (2007).

Engineering geological condition.
Geotechnical Engineering Test Monitoring Manual.
Foundation Engineering Manual, Fang Xiaoyang, Qian Hongxu, et a.l.
Monitoring and supervision of geotechnical engineering.
Pan, Civil Engineering monitoring technology.