Heave Studies on Fly Ash-Stabilised Expansive Clay Liners

B. R. Phanikumar; M. Uma Shankar

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Heave Studies on Fly Ash-Stabilised Expansive Clay Liners

机译：Heave Studies on Fly Ash-Stabilised Expansive Clay Liners

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Clay liners or compacted earthen barriers are important barrier materials used for preventing contaminant transport through soils. A low hydraulic conductivity (k) is a significant parameter that governs the design and construction of clay liners. Compacted expansive clays, which are montmorillonite clays, also have a very low hydraulic conductivity (k). When expansive clays are blended with fly ash, an industrial waste, the hydraulic conductivity (k) further reduces as the ash-clay blends result in increased dry densities at increased fly ash contents. Hence, fly ash-stabilised expansive clay can also be proposed as a unique clay liner material. As expansive clays undergo heave when they come into contact with water, it is necessary to study the heave behaviour of fly ash-stabilised expansive clay liners. This paper presents heave studies on fly ash-stabilised expansive clay liners. Fly ash in different contents by dry weight of the expansive clay was added to the clay, and the ash-clay blend was compacted as a liner overlying a natural field soil layer. Compacted lateritic clay was used for simulating the natural field soil into which contaminants migrate. Calcium chloride (CaCl_2) solution of varying concentration (5,10,20,50,100 and 500 mM) was used as the permeating fluid in the heave studies. The rate of heave and the amount of heave of the fly ash-stabilised expansive clay liners were monitored. Deionised water (DIW) was also used as inundating fluid for comparative study. Heave (mm) decreased with increase in solute concentration for all fly ash contents. For a given solute concentration, heave decreased up to a fly ash content of 20 and thereafter it increased when the fly ash content was increased to 30 . Heave of the fly ash-stabilised expansive clay liners was correlated with their permeability, liquid limit (LL) and free swell index (FSI) pertaining to the respective fly ash content and CaCl_2 concentration.

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《Geotechnical and geological engineering》 |2017年第1期|111-120|共10页
作者
B. R. Phanikumar; M. Uma Shankar;
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作者单位

Department of Civil Engineering, School of Mechanical and Building Sciences, VIT University, Vellore 632 014, India;

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原文格式 PDF
正文语种英语
中图分类地质学;
关键词
Fly ash-stabilised expansive clay liner; Hydraulic conductivity (k); Heave; Liquid limit (LL); Free swell index (FSI);

Heave Studies on Fly Ash-Stabilised Expansive Clay Liners

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