Reduction of Heaving of Alkali Contaminated Soil
The effect of alkaline solutions on engineering behaviour of foundation soils is attracting great attention because of its wide spread use in industry and possible soil contamination. The effect of strong alkali solution on volume change behaviour of natural black cotton soil present in the alumina extraction plant premises has been studied in order to understand the mechanism of heaving in the foundation soil, which can help to formulate a scheme to control the heave. The results indicate that an increase in swelling and compressibility of the soil upon contamination occur. The observed high swelling occurs in two stages. The first stage of swelling is due to conventional adsorption of water by negatively charged particles and the second phase of swelling is by dissociation of interstratified mineral, rectorite, present in the soil into its constituent minerals, viz., smectite and illite. The dissociation causes much higher swelling than in the mixed layer mineral. Potassium chloride, which can link expansive minerals, has been proposed to control the induced heave. This paper reports the effect of 2％ and 5％ potassium chloride (KCI) on the volume change behaviour of the soil contaminated with alkali. It has been shown that the dissociation can nether be prevented nor reversed by potassium chloride but can be used to reduce the swelling caused by negative charges on clay particles.
Alkali volume change KCI remediation
P. Hari Prasad Reddy P. V. Sivapullaiah
Department of Civil Engineering, Indian Institute of Science, Bangalore-560012, India Professor, Department of Civil Engineering, Indian Institute of Science, Bangalore-560012, India
国际会议
北京
英文
82-92
2007-08-20（万方平台首次上网日期，不代表论文的发表时间）