Flexural Performance of Cement Treated Clay-Sand Mixtures Reinforced with Synthetic Fibers

Abstract

The effects of synthetic fibers, cement content, and sand content on the flexural performance of cement-clay-sand mixtures has been evaluated through a flexural performance test with a third-point loading. Beam specimens for the flexural performance test were fabricated with a various amount of cement, sand, and synthetic fibers. Two types of fibers, PVA (Polyvinyl alcohol) and PP (Polypropylene) fibers, were employed in the test. The test results have exhibited that the factors considered in the test have significant effects on the flexural performance of the mixtures in several aspects. The flexural performance of the mixtures has been improved if the mixtures were reinforced with synthetic fibers. The flexural strength and the flexural toughness of the mixtures has been increased as the fiber content was increased. A multiple linear regression analysis has been performed to evaluate the effect of fiber content, cement dosage, and sand content on the flexural performance of the mixtures in terms of flexural strength and flexural toughness. Cement content and sand content were estimated as important factors to have an influence on the first-crack strength and the peak strength whereas the fiber content has the most significant influence on the post-crack behavior. The first-crack strength and the ultimate strength were increased as the cement content and the sand content were increased. As the fiber content was increased, the flexural toughness was increased.(PP, PVA) (6mm, 12mm), (0.5%, 1.0%, 1.5%) . . , .Keywords : Flexural performance test, Synthetic fiber, Cement content, Sand content, Fiber content, PP fiber, PVA fiber 한국지반신소재학회논문집 제16권 1호 2017년 3월 pp. 19 ∼ 29 J. Korean Geosynthetics Society Vol.16 No.1 March. 2017 pp. 19 ~ 29 DOI: https://doi.org/10.12814/jkgss.2017.16.1.019 ISSN: 2508-2876(Print) ISSN: 2287-9528(Online)