Effect of Fly Ash on PVA Fiber/Cementitious Matrix Interfacial Interactions and Tensile Properties of Composites

Abstract

Abstract: The effects of fly ash content on matrix strength, the interfacial interactions between polyvinyl alcohol (PVA) fiber and cementitious matrix, and the tensile properties of strain-hardening cementitious composites (SHCC) with non-surface-modified PVA fibers were investigated. The results show that with the increase of fly ash content, the 28 d compressive strength of the matrix declines within the range of 18~93 MPa. The uniaxial tensile test results show that the effect of fly ash on SHCC at 20% (mass fraction, the same below) and 50% dosages is insignificant. With the fly ash dosage increasing to 67% and 80%, the multiple-microcracks and strain-hardening characteristics of SHCC tend to be enhanced, and the corresponding ultimate strain increases, up to 7.2%, and SHCC has a characteristic of light weight. The results of fiber pullout test display that the high content of fly ash not only reduces the chemical bond between PVA fibers and the matrix, but also weakens the interfacial friction, which effectively inhibits the premature rupture of PVA fibers during the pullout process, and enhances the ductility of SHCC with non-surface-modified PVA fibers.

Key words: concrete, strain-hardening cementitious composite, fly ash, multiple-microcracks, ductility, uniaxial tensile, fiber pullout

CLC Number:

TB332

YAO Zhigao, LIN Chang, CAI Shu, XU Shuying, PAN Lisha. Effect of Fly Ash on PVA Fiber/Cementitious Matrix Interfacial Interactions and Tensile Properties of Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(7): 2327-2336.

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