Strength enhancement of peat stabilized with rubber chips

Nur Rasfina, Mahyan and Siti Noor Linda, Taib and Norazzlina, M.Sa'don and Liyana, Truna (2022) Strength enhancement of peat stabilized with rubber chips. Journal of Engineering Science and Technology, 17 (5). pp. 3360-3377. ISSN 1823-4690

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Abstract

Peat is often considered a problematic deposit with poor geotechnical characteristics, and which regularly requires stabilization to withstand any building or infrastructure constructed on it. Since structural damages due to peat deposits such as ground settlement, slope failure, and poor stability occurs, it is important to investigate the characteristics of peat and methods to improve its strength properties. This study proposes the use of various percentages of cement in a suitable water-additive (W/A) ratio, with rubber chips as a stabiliser and sand as a filler. The optimum W/A ratio needed to attain the maximum unconfined compressive strength (qu) and to achieve the greatest reductions in the permeability coefficient (k) was investigated. The peat was treated with admixtures that included peat with its natural moisture content, 15% sand, and 10% rubber chips at three different W/A ratios of 2.0, 2.5, and 3.0. The W/A ratio of 2.0 was indicated to be the optimum ratio of stabilized peat as it achieved the highest maximum strength, 106.75kPa, and attained the highest reduction in permeability coefficient, -49.42%, compared to the other W/A ratios. Peat stabilization with other additives, such as lime and gypsum, at W/A ratios over 3.0 for curing periods of over 28 days should be conducted to produce the best strength variation that treated peat can achieve.

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