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Influence of water and mica content on resilient properties of coarse granular materials

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Elevated amounts of free mica particles in unbound granular materials used in road construction are believed to detrimentally influence bearing capacity. The objective of presented work was to investigate the influence of mica content on resilient properties of coarse granular material (maximum particle size 63 mm) under varying water contents. The test scheme comprised triaxial tests, using constant confining pressures, at incrementally raised water contents up to practically full saturation. Increased mica content was achieved by replacing a part of the base material grading smaller than 4 mm, with an equal amount of pure muscovite mica of similar grading, hence keeping the overall particle size distribution unchanged. Generally, resilient modulus decreased with increased mica content and elevated water contents caused reduction in stiffness. In relative terms, the reduction in resilient modulus caused by water decreased with increased mica content.
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Keywords: Granular materials; Mica; Moisture; Time domain reflectometry; Triaxial test

Document Type: Research Article

Affiliations: Division of Highway Engineering, Royal Institute of Technology, Stockholm, Sweden

Publication date: 01 June 2008

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