Reduction of Expansive Index, Swelling and Compression Behavior of Kaolinite and Bentonite Clay with Sand and Class C Fly Ash

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 f...

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Bibliographic Details
Published in:Geotechnical and geological engineering 2016-02, Vol.34 (1), p.87-101
Main Authors: Kolay, P. K., Ramesh, K. C.
Format: Article
Language:English
Subjects:
Bentonite
Civil Engineering
Clay
Compression
Earth and Environmental Science
Earth Sciences
Expansion
Expansion reducing admixtures
Expansive soils
Fly ash
Geotechnical engineering
Geotechnical Engineering & Applied Earth Sciences
Hydrogeology
Kaolinite
Liquid limits
Original Paper
Plastic limit
Plasticity
Pressure
Properties
Reduction
Sand
Shrinkage
Soil
Soil properties
Soil shrinkage
Swelling pressure
Terrestrial Pollution
Waste Management/Waste Technology
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Summary: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.
ISSN:0960-3182
1573-1529
DOI:10.1007/s10706-015-9930-4