Strength and durability parameters of a cemented sedimentary silt for application in paving
DOI:
https://doi.org/10.14295/transportes.v28i5.2106Keywords:
Soil-cement. Durability. Strength. Guabirotuba Formation. Paving.Abstract
This paper presents the strength and durability parameters of sedimentary silt from Curitiba (Brazil) stabilized with cement for potential use in paving. Splitting tensile strength, unconfined compressive strength and loss of mass against wetting and drying cycles (W/D) were researched in the laboratory using greenish-gray silt (originating from one of the horizons of the Guabirotuba Formation - Paraná) and high-early strength Portland cement- ARI (CPV). Cement contents (C) of 3, 5, 7 and 9% were used, molding dry unit weights (γd) of 14, 15 and 16 kN/m3, curing times (t) of 7, 14 and 28 days, and fixed moisture content (ω) of 23%. The results demonstrate that with the increase of the cement content and the curing time, there is a gain of strength, microstructure improvement, and a decrease in the accumulated mass loss (ALM) and the initial porosity (η) of the compacted mixtures. The porosity/volumetric cement content ratio (η/Civ) was used to determine the minimum amount of cement necessary to stabilize the soil according to the parameters of strength and durability. Finally, C=5% by weight is the minimum content that satisfies the requirements for potential soil use in the sub-base.
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