Ekinci, A; Ferreira, PMV; (2012) Effects of fibre reinforcement in the shrinkage behaviour of compacted clay. In: Atalar, C and Çinicioğlu, F and Das, BM and Sağlamer, A and Toğrol, E, (eds.) Third International Conference on New Developments in Soil Mechanics and Geotechnical Engineering. (pp. pp. 455-461).

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Abstract

The stability of clay slopes and liners is intimately connected to desiccation cracking. To mitigate this problem, research has been performed on mixtures of soil with additives such as lime, cement and/or fibres. Chemical additives tend to generate stiff materials and may leach and create environmental problems; therefore, fibre reinforcement became an interesting alternative as it reduces the cracking formation and cracking propagation in soils subjected to wetting and drying, as well as accommodating certain displacements. In this article, results of a pilot study on reinforced and unreinforced compacted samples of clay from the Lambeth Group, subjected to desiccation, are presented. The samples were compacted according to the BS 1377- 4:1990, using 3 different moisture contents (optimum and optimum plus and minus 2%). For all moisture contents, 3 samples were prepared with 0, 0.2% and 0.4 % of fibres by dry weight. Fibres and soil were hand mixed in order to achieve a homogeneous fibre distribution. While the samples were drying, their height, diameter and weight were measured. Photographs were also taken in order to verify the occurrence of desiccation cracking. The results show that the reinforced samples have a lower volumetric deformation and desiccation cracking was not visible while the unreinforced samples showed a higher volumetric reduction, with large cracks visible between the compacted layers of soil.

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