Combined Influences of Cement, Rice Husk Ash and Fibre on the Mechanical Characteristics of a Calcareous Sand

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Combined Influences of Cement, Rice Husk Ash and Fibre on the Mechanical Characteristics of a Calcareous Sand

Tavakol, Kamran / Bayat, Meysam / Nadi, Bahram / Ajalloeian, Rassoul

Many available stabilisers and reinforcements have been used to enhance the mechanical characteristics of silica sand. So far, many studies have been carried out to understand the influence of various old and new additives such as natural and synthetic fibres or traditional stabilisers on the mechanical characteristics of silica sands. However, there is minimal study on the mechanical characteristics of stabilised or reinforced calcareous sands. The main focus of the current study was to evaluate the influences of relative density (Dr), Portland cement (C) content, rice husk ash (RHA) content and synthetic polypropylene fibre (PPF) content on the mechanical characteristics of a calcareous sand, which were: Dr [30%, 80%], C [0, 3%, 5%, 7.5%], RHA [0, 7%, 7.5%, 10%], and PPF [0%, 1%]. For this purpose, direct shear tests have been conducted on treated calcareous sand subjecting to three curing times (7, 14, and 28 days). The test results indicate that adding cement, rice husk ash and polypropylene fibre increases the shear strength and reduces the volumetric strain under shear loading. Thespecimens containing 7.5% cement and 7.5% RHA generally exhibited the highest shear strength and the lowest volumetric strain. Relative density, cement content, RHA content, fibre content and curing time have more important effects on the cohesion than the friction angle of treated specimens.