Compressive strength of compacted clay-sand mixes

Khan, F., Azam, S., Raghunandan, M.E., and Clark, R. (2014), Advances in Materials Science and Engineering, 2014 (Article No.: 921885), 1-6. doi: 10.1155/2014/921815 (ISI: Q4; Impact factor: 0.744, 2014), 2014

The use of sand to improve the strength of natural clays provides a viable alternative for civil infrastructure construction involving earthwork. The main objective of this note was to investigate the compressive strength of compacted clay-sand mixes. A natural clay of high plasticity was mixed with 20% and 40% sand (SP) and their compaction and strength properties were determined. Results indicated that the investigated materials exhibited a brittle behaviour on the dry side of optimum and a ductile behaviour on the wet side of optimum. For each material, the compressive strength increased with an increase in density following a power law function. Conversely, the compressive strength increased with decreasing water content of the material following a similar function. Finally, the compressive strength decreased with an increase in sand content because of increased material heterogeneity and loss of sand grains from the sides during shearing.

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