INFLUENCE OF CALCIUM CHLORIDE (CaCl2) ON THE STRENGTH CHARACTERISTICS OF SAND-BENTONITE MIXTURES
Kanumuri T V S Ravindra Varma
Post Graduation student, Soil Mechanics and Foundation Engineering, Dept. of Civil Engineering, JNTUK-UCEK, Kakinada, Andhra Pradesh, India. , IN
Keywords: Sand-Bentonite mixture, Sodium Bentonite, Strength Characteristics, Calcium Chloride, Direct Shear test.
Abstract
Sand-Bentonite mixtures have been used as barrier/liner material in many engineering applications such as cores of earthen dams, landfill, cut-off walls and also in hydraulic containments such as reservoirs. The present study focuses on the influence of Calcium Chloride (CaCl2) on the strength characteristics of Sand-Bentonite mixtures. In this study, the Atterberg limits, strength characteristics of sand-bentonite mixtures are investigated for different percentage compositions of sand, bentonite and also for different percentage addition of CaCl2 to support recommendation for a cost-effective liner/barrier material. A series of modified compaction tests and direct shear tests for strength characteristics were conducted on different sand-bentonite mixtures and sand-bentonite-CaCl2 mixtures. The mixtures were formed by mixing the locally available Godavari river sand with sodium bentonite in the percentage
replacement of 0%, 15%, 30%, 45% by dry weight of sand. Later CaCl2 in the proportions of 0%, 0.5%, 1.0%, 1.5% is added to the optimum of the sand-bentonite mixtures. The optimum sand-bentonite-CaCl2 mixture is cured for 1 day, 7 days, 14 days and tested for its shear strength parameters. From the laboratory test results it was found that Sand-Bentonite mixture of S:B(70:30) with 1% addition of CaCl2 has the optimum strength parameters
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