干旱区生态环境知识资源中心(Arid): Evaluation of red soil-bentonite mixtures for compacted clay liners

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DOI	10.1016/j.jrmge.2023.04.006
	Evaluation of red soil-bentonite mixtures for compacted clay liners
	Devapriya, A. S.; Thyagaraj, T.
通讯作者	Thyagaraj, T
来源期刊	JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
ISSN	1674-7755
EISSN	2589-0417
出版年	2024
卷号	16 期号:2 页码:697-710
英文摘要	Compacted clay liners are an integral part of the waste landfills, which are provided to contain the leachate within the landfills and protect the surrounding environment. Generally, locally available natural soils are used for the construction of compacted clay liners if they satisfy the design criteria. However, not all soils in their natural state satisfy all the design criteria for the liner materials. Thus, there is a definite need to modify the locally available natural soils by blending with bentonite to meet the required design criteria for the liners. In view of this, the present study evaluates the suitability of an Indian red soil enhanced with bentonite as a liner material. To achieve this, a series of experiments were carried out using locally available red soil and bentonite. First, the suitability of the red soil was evaluated as a liner material. The experimental results showed that the red soil met all the selection criteria stipulated by the Environmental Protection Agencies (EPAs) for the liners except the hydraulic conductivity criterion. Therefore, the red soil was mixed with bentonite contents of 10%, 20% and 30%, and the red soil-bentonite mixtures were evaluated for their suitability for liners in their compacted state. Further, as the liners in the arid and semi-arid regions are subjected to moisture variations due to seasonal moisture fluctuations and other factors, the red soil-bentonite mixtures were subjected to wetdry cycles, and their suitability was evaluated after wet-dry cycles. The experimental results revealed that all the red soil-bentonite mixtures met the stipulated EPA criteria for the liners in the as-compacted state. However, the red soil-bentonite mixtures with 20% and 30% bentonite contents only satisfied the hydraulic conductivity requirement even after wet-dry cycles. The experimental findings were supplemented with the microstructural insights captured through digital camera images, scanning electron microscopy (SEM), and mercury intrusion porosimetry (MIP) studies. O 2024 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).
英文关键词	Compacted clay lines Hydraulic conductivity Wet-dry cycles Microstructure
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:001233815500001
WOS关键词	HYDRAULIC CONDUCTIVITY ; WATER-CONTENT ; BEHAVIOR ; DESICCATION ; MICROSTRUCTURE ; BARRIERS ; CRACKING ; LIME
WOS类目	Engineering, Geological
WOS研究方向	Engineering
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404681
推荐引用方式 GB/T 7714	Devapriya, A. S.,Thyagaraj, T.. Evaluation of red soil-bentonite mixtures for compacted clay liners[J],2024,16(2):697-710.
APA	Devapriya, A. S.,&Thyagaraj, T..(2024).Evaluation of red soil-bentonite mixtures for compacted clay liners.JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,16(2),697-710.
MLA	Devapriya, A. S.,et al."Evaluation of red soil-bentonite mixtures for compacted clay liners".JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 16.2(2024):697-710.