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1. Mechanical Properties of Grouting Materials for Heavy Metal Contaminated Soil in Acid Conditions | |||
YANG Yuyou,LI Xiangqian,DOU Haijun | |||
Civil and Architectural Engineering 01 December 2015 | |||
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Abstract:Fast anti-seepage and anti-corrosion are two difficult problems to be solved in an acid environment having abundant water and high content heavy metal. In this study, new grouting material with acid corrosion resistance was formed by adding slag and fly ash to cement-water glass two-shot grouting material. It is noted that the rapid setting of two-shot grout was maintained. Setting time and fluidity were tested and both satisfied the requirements of actual engineering. Scanning electron microscope (SEM), Uniaxial compressive strength test, and X-ray diffraction (XRD) were used to test the microstructure of grout gels, mechanical properties, and components, respectively. Before and after corrosion, uniaxial compressive strength of new grouting material was 16.8MPa before the corrosion and the strength was 10.6MPa after the corrosion signifying the corrosion resistance.Test results of XRD and SEM indicated that hydration products dissolution and microstructure destruction are the main reasons which decreases the grout gel strength due to acid corrosion. | |||
TO cite this article:YANG Yuyou,LI Xiangqian,DOU Haijun. Mechanical Properties of Grouting Materials for Heavy Metal Contaminated Soil in Acid Conditions[OL].[ 1 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4662199 |
2. Mechanical Properties and Microstructure Characterization of Heavy Metal Contaminated Mine Soils Solidified by Cement and Phosphate-based Binder | |||
YANG Yuyou,WU Haoliang,DU Yanjun,YI Yucheng | |||
Civil and Architectural Engineering 16 November 2015 | |||
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Abstract:Mine soil restoration is very important for ecological environment and residents life. This paper presents a study on mine soils, from the Baoshan, Hunan province, China, contaminated with heavy metals and stabilized by using a new phosphate-based binder (KMP) and ordinary portland cement (OPC). Aiming to explore the effects of binder type, binder content (%) and curing age of contaminated soils on environmental safety and strength properties of the soils contaminated with heavy metals in the mining area, toxicity characteristic leaching procedure (TCLP), acid-neutralizing capacity (ANC) test, sequential extraction procedure (BCR), unconfined compression test (UCT), X-ray diffraction (XRD) and scanning electron microscopic (SEM) procedures were carried out. Test results showed that as the curing age was increased from 0 d to 28 d, KMP and OPC stabilized contaminated soil underwent several changes: leaching of Zn and Pb gradually reduced, ANC (β) increased, exchangeable Zn and Pb decreased, residual contents increased and strength improved. When the binder content increases from 4% to 8% at the curing age of 28 d, the concentrations of leached Zn and Pb of KMP stabilized contaminated soil decreased by 64.2% and 60.05%, respectively; its ANC (β) increased by 2.97%; its residual Zn and Pb increased by 1.41 and 3.04 times, respectively; and its strength increased by 12.28%. Meanwhile, the concentrations of leached Zn and Pb of OPC stabilized contaminated soil decreased by 67.01% and 84.03%; its ANC (β) increased by 12.97%; its residual Zn and Pb increased by 1.84 and 1.25 times respectively and its strength increased by 24.05%. At the same curing conditions and binder content, KMP stabilized contaminated soil showed a lower leached Zn and Pb content than that by OPC, a higher ANC (β) by 1.65, more residual Zn and Pb by 41.5% and 89.01% respectively and an enhanced strength by 3.48-10.21%. (10 Points, Times New Roman) | |||
TO cite this article:YANG Yuyou,WU Haoliang,DU Yanjun, et al. Mechanical Properties and Microstructure Characterization of Heavy Metal Contaminated Mine Soils Solidified by Cement and Phosphate-based Binder[OL].[16 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4662202 |
3. A semi-analytical method to solve reaction on pier top induced by high-speed train over continuous girder bridge | |||
Cao Yanmei | |||
Civil and Architectural Engineering 18 April 2012 | |||
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Abstract:In order to calculate the force transmitted to the top of pier induced by high-speed train running through continuous girder bridge, the semi-analytical dynamic interaction model is established for train-track-continuous girder bridge system, in which the dynamic character-istics of train, track, and bridge are taken into account. In the method, all the derivations are carried in the frequency domain and the vibrations in the time domain are obtained by inverse Fourier transformation, which makes it very convenient to observe dynamic characteristics of train-track-bridge structure from the point of frequency. Compared to the FEM model, the presented semi-analytical method is easier to calculate and the solution is more accurate. | |||
TO cite this article:Cao Yanmei. A semi-analytical method to solve reaction on pier top induced by high-speed train over continuous girder bridge[OL].[18 April 2012] http://en.paper.edu.cn/en_releasepaper/content/4475810 |
4. An Health Impact Assessment Model of Building | |||
LI Xiaodong,KONG Xiangqin,GAO Yuanxue | |||
Civil and Architectural Engineering 02 January 2011 | |||
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Abstract:To assess the life cycle health impact of the building objectively, this paper presents a building health impact assessment (HIA) model. Based on the life cycle assessment (LCA) theory, the model classifies the health impact of the building into three categories: global warming, respiratory effect and carcinogenesis. In each category, the link between an emission and the consequent potential damage is established by four procedures: fate analysis, exposure analysis, effect analysis and damage analysis. Furthermore, a set of databases needed in each procedures is developed. The paper is offering a general overview of how to identify and assess the health impacts of the building quantitatively. This model can be used as a tool for project manager to make environment-friendly decisions in construction plans. | |||
TO cite this article:LI Xiaodong,KONG Xiangqin,GAO Yuanxue. An Health Impact Assessment Model of Building[OL].[ 2 January 2011] http://en.paper.edu.cn/en_releasepaper/content/4403273 |
5. Study on Grouting and Bolting Reinforcement Method and Its Application to Collapse Area in Transport Roadways | |||
QIAO Lan,SUI Zhili | |||
Civil and Architectural Engineering 06 December 2010 | |||
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Abstract:The grouting and bolting reinforcement method is widely used for ground support in underground mines. In the present study, the rock support mechanism of grouting in combination with bolting device is studied, and subsequently the key technical issues associated with this support approach are analyzed. Based on a practical case of the collapse area of the main transport roadway at a underground mine in China, a systemic support design is proposed and used to control the development of collapse area. Meanwhile, a 3D numerical modeling with FLAC3D is utilized to simulate the stability of surrounding rock mass after supporting. By calculating the displacement of surrounding rock and the change of maximum unbalanced forces, the stability of the collapse area of the roadway has a great improvement after applying the grouting and bolting reinforcement method, and the operation safety of the transport roadways can be guaranteed effectively. | |||
TO cite this article:QIAO Lan,SUI Zhili. Study on Grouting and Bolting Reinforcement Method and Its Application to Collapse Area in Transport Roadways[OL].[ 6 December 2010] http://en.paper.edu.cn/en_releasepaper/content/4395429 |
6. In-situ Liquefaction Evaluation Based On CPT Testing | |||
QIAO Lan,GAO Wen | |||
Civil and Architectural Engineering 06 December 2010 | |||
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Abstract:To improve handling capacity of ports, expansion of land by reclamation along the coast is becoming more prevalent in many ports, such as the Jeddah Islamic Port, Saudi Arabia. There usually exists liquefaction potential of thick and soft clay deposits which needs to be eliminated. Here, the in-situ liquefaction potential is evaluated using CPT. | |||
TO cite this article:QIAO Lan,GAO Wen. In-situ Liquefaction Evaluation Based On CPT Testing[OL].[ 6 December 2010] http://en.paper.edu.cn/en_releasepaper/content/4395423 |
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