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Properties of Bentonite Stabilised with Fluorogypsum

Rakesh Kumar Dutta, Mohammad Saqib Bin Lateefa

Abstract


This paper presents the properties of the bentonite stabilised with fluorogypsum. For this purpose, commercially available bentonite and fluorogypsum were used in this investigation. The fluorogypsum content and the curing period were varied from 0% to 10 % and 0 to 28 days respectively. Compaction tests results reveal that the maximum dry unit weight increases and optimum moisture content decreases with the increase in the fluorogypsum content to the bentonite. Further, 2 % fluorogypsum content in bentonite is effective in reducing the liquid limit of the bentonite drastically. However, effect of fluorogypsum on the reduction in the plastic limit of the bentonite is comparatively low. The liquidity index decreases with the increase in fluorogypsum content in the bentonite while as it increases with the increase in the curing period. The axial stress at peak as well as strain at failure increased with the increase in the fluorogypsum content added to the bentonite as well as the curing period. The axial stress at peak as well as strain at failure increased with the increase in the moisture content from OMC-3% to OMC+3%. Water content on the wet-side of optimum moisture content i.e. OMC+3% were effective in producing best results. The SEM-EDAX studies have demonstrated the development of cementation compounds by adding fluorogypsum to the bentonite. Such compounds were responsible for the improvement in the axial stress at failure with the increase in the curing period.

Keywords: Compaction test; optimum moisture content; maximum dry unit weight; axial stress; liquidity index

Cite this Article: Mohammad Saqib Bin Lateef, Rakesh Kumar Dutta. Properties of Bentonite Stabilised with Fluorogypsum. International Journal of Geological and Geotechnical Engineering. 2020; 6(1): 10–20p.


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