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1. 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 |
2. 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 |
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