Effect of long-term acid attack on impermeability and microstructure of compacted cement-bound soils

CSpace

	Effect of long-term acid attack on impermeability and microstructure of compacted cement-bound soils
	Dong, Zhiwei ; Wan, Yong ; Wang, Ping ; Chen, Zhen ; He, Xingxing ; Hui, Xinminnan
	2022-07-07
发表期刊	ENVIRONMENTAL TECHNOLOGY
ISSN	0959-3330
摘要	Compacted cement-bound soils (CCS) are widely used as leakage barriers around solid waste landfills and contaminated sites. However, a study of its long-term reliability in an acidic environment is relatively scarce. A 3-year-long experimental study on the changes in permeability coefficient and microstructure of CCS under acid attack was conducted, from which the following conclusions can be drawn: the permeability coefficient of CCS under weak acid (pH = 5.00) attack decreased progressively with time, from 4.90 x 10(-8) cm/s at the beginning to 6.70 x 10(-10) cm/s after 3 years. Under strongly acidic environments with pH values of 2.65 and 3.65, the permeability coefficients of CCS initially decreased and then increased with time, reaching 6.70 x 10(-5) and 9.37 x 10(-8) cm/s, respectively. The degradation effect of a weak acid (pH = 5.00) on the hydration products of cement was mild as a large amount of hydration products (e.g. C-S-H shaped in short fibrous) remained in the pores of CCS after 3 years of immersion. However, strong acid caused an obvious degradation effect on the hydration products, which almost disappeared after 3 years of immersion. Based on the study data, a unified mathematical model was developed to correlate the permeability coefficient of CCS, immersion time and acidic solution pH value. Furthermore, a quantitative expression function between the service life of CCS and solution pH value was established.
关键词	Compacted cement-treated soil permeability coefficient acid solution long-term erosion microstructure
学科领域	Environmental Sciences & Ecology
语种	英语
WOS类目	Environmental Sciences
WOS记录号	WOS:000825797300001
出版者	TAYLOR & FRANCIS LTD
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://119.78.100.198/handle/2S6PX9GI/35300
专题	中科院武汉岩土力学所
作者单位	1.Chinese Academy of Sciences; Wuhan Institute of Rock & Soil Mechanics, CAS; 2.Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; 3.Chinese Academy of Sciences; Tsinghua University
推荐引用方式 GB/T 7714	Dong, Zhiwei,Wan, Yong,Wang, Ping,et al. Effect of long-term acid attack on impermeability and microstructure of compacted cement-bound soils[J]. ENVIRONMENTAL TECHNOLOGY,2022.
APA	Dong, Zhiwei,Wan, Yong,Wang, Ping,Chen, Zhen,He, Xingxing,&Hui, Xinminnan.(2022).Effect of long-term acid attack on impermeability and microstructure of compacted cement-bound soils.ENVIRONMENTAL TECHNOLOGY.
MLA	Dong, Zhiwei,et al."Effect of long-term acid attack on impermeability and microstructure of compacted cement-bound soils".ENVIRONMENTAL TECHNOLOGY (2022).