Cement Type Effect on Improvement of Clayey Soil Properties

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Title: Cement Type Effect on Improvement of Clayey Soil Properties

Author(s): Murat Mollamahmutoglu and Eyubhan Avcı

Publication: Materials Journal

Volume: 115

Issue: 6

Appears on pages(s): 855-866

Keywords: calcium aluminate cement; clay; compressibility; strength; sulfate-resistant cement; swelling

Date: 11/1/2018

Abstract:
In this paper, some geotechnical properties of low-plasticity clay blended with calcium aluminate cement (CAC) at different contents were investigated and compared with those of sulfate-resistant cement (SRC)-blended low-plasticity clay. As the liquid limits of CAC and SRC-blended low-plasticity clay decreased, their plastic limits increased. Additionally, the liquid limit and the plastic limit of CAC-blended low-plasticity clay were found to be lower than those of SRC-blended low-plasticity clay. The optimum moisture content and maximum dry density of low-plasticity clay were increased by both CAC and SRC agents. Moreover, the optimum moisture content and maximum dry density values of CAC-blended low-plasticity clay were higher than those of SRC-blended low-plasticity clay. The shear strength of low-plasticity clay was also increased with the CAC and SRC additives. The internal friction angles of CAC-blended low-plasticity clay were higher than those of SRC-improved low-plasticity clay under both the wet-cured and air-dried conditions. The cohesion intercepts of CAC-improved low-plasticity clay under both the wet-cured and air-dried conditions were lower than those of SRC-improved low-plasticity clay. The compressibility and swell characteristics of low-plasticity clay were considerably reduced with both CAC and SRC admixtures. However, the swell and compressibility of CAC-blended low-plasticity clay were lower than those of SRC-blended low-plasticity clay. Generally, the CAC agent was more effective than the SRC agent in the improvement of aforementioned low-plasticity clay properties.