Journal Published Online: 10 May 2019
Volume 49, Issue 1

Cement-Improved Wetting Resistance of Coarse Saline Soils in Northwest China

CODEN: JTEVAB

Abstract

Wetting-induced collapse of coarse saline soil foundations is a frequently encountered problem in the inland basin of Northwest China, but this particular behavior and relevant treatment have not been given adequate attention. Specimens treated by silicate cement were used in wetting collapse testing at conventional foundation loads, with five cement contents and four curing durations considered. The results indicate that in the case of no curing, the collapsible deformation during wetting declines at higher cement contents, and a stepwise development of deformation was noticed over the wetting duration. Specimens treated by cement after curing exhibit a decrease in the compressive deformation during wetting, and part of them show volume expansion instead. The complex hydrolysis and hydration reaction of cement in the process of curing primarily accounts for this. Moreover, the collapsibility coefficient varies within a narrow range in the noncuring case, proving the limited influence of cement inclusion; however, a gentle range, from 2.0 to 4.0 %, can be found after curing, beyond which it slightly varies. An elastoplastic model was established, incorporating a variable boundary seepage equation, and was then used for modeling a field immersion test. The rationality of the model was verified by comparing the measured and simulated results, including the degree of saturation and vertical displacement. The optimal depth and width for cement treatment was discussed in view of the practical engineering.

Author Information

Xu, Jian
School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi, China
Li, Yanfeng
School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi, China
Wang, Songhe
Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an, Shaanxi, China
Ren, Jianwei
School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi, China
Ding, Jiulong
Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an, Shaanxi, China
Wang, Qinze
Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an, Shaanxi, China
Cheng, Dongxing
Northwest Electric Power Design Institute Co., Ltd. Of China Power Engineering Consulting Group, Xi’an, Shaanxi, China
Yu, Fan
Department of Civil Engineering, McMaster University, West Hamilton, Ontario, Canada
Pages: 26
Price: $25.00
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Stock #: JTE20180533
ISSN: 0090-3973
DOI: 10.1520/JTE20180533