Evaluation of hydraulic conductivity and self-healing potential of punctured geosynthetic clay liner

ABSTRACT

An experimental study was conducted on the modified geosynthetic clay liner (GCL) specimen by replacing encapsulated Sodium Bentonite (Na-B) with different percentages of locally available black cotton soil (BCS). The specimens with punctured hole sizes of 4, 8, and 12 mm in diameter were tested for hydraulic conductivity and self-healing capacity assessed by improved triaxial apparatus. The flowing permeant was prepared with the heavy metals: iron, zinc, nickel, and total chromium based on the results of the chemical analysis of leachate collected from the municipal solid waste site (MSW). The experiment results were observed at 24, 48 and 72 hours. The results were analysed to identify the best specimen mix (Na-B and BCS) regarding the lowest hydraulic conductivity and highest self-healing potential. The results demonstrated that BCS can be utilized in modified GCL as an impermeable barrier for leachate percolation at the MSW dump site.

KEYWORDS:

• Black cotton soil
• geosynthetic clay liner
• hydraulic conductivity
• self-healing

Disclosure statement

No potential conflict of interest was reported by the author(s).

Authors contributions

Abhishek Dixit: Conceptualization, Methodology, Manuscript writing – Original draft preparation; Deepesh Singh: Visualization, Investigation, Writing − Reviewing and Editing; Sanjay Kumar Shukla: Writing – Reviewing and Editing.

Data availability statement

All generated and analysed data during this study are included in this article.

Additional information

Funding

The author(s) reported there is no funding associated with the work featured in this article.