Authors: P K Kolay K C Ramesh
Publish Date: 2015/09/28
Volume: 34, Issue: 1, Pages: 87-101
Abstract
Swelling behavior of expansive soil has always created problems in the field of geotechnical engineering Generally the method used to assess the swelling potential of expansive soil from its plasticity index shrinkage limit and colloidal content Alternative way to evaluate swelling behavior is from its expansive index EI and swelling pressure value The present study investigates the reduction of EI and swelling pressure for kaolinite and bentonite clay when mixed with various percentages of Ottawa sand and Class C fly ash The percentages of Ottawa sand and Class C fly ash used were 0–50 by weight The results show that there is a significant reduction in the swelling properties of expansive soil with the addition of Ottawa sand and Class C fly ash The reduction in EI ranged approximately from 10 to 50 and 4 to 49 for kaolinite and bentonite clay respectively Also the maximum swelling pressure of kaolinite and bentonite clay decreased approximately 93 and 64 respectively with the addition of various percentages of Ottawa sand and Class C fly ash Standard index properties test viz liquid limit plastic limit and linear shrinkage test were conducted to see the characteristics of expansive soil when mixed with less expansive sand and fly ash Also for these expansive soils one dimensional consolidation test have been conducted with sand and fly ash mixtures and the results were compared with pure kaolinite and bentonite clay
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