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Residual stress-strain relationship of Scoria aggregate concrete with the addition of PP fiber after fire exposure

Cai, B., Yu, T. & Fu, F. ORCID: 0000-0002-9176-8159 (2021). Residual stress-strain relationship of Scoria aggregate concrete with the addition of PP fiber after fire exposure. Fire journal, 4(4), 91. doi: 10.3390/fire4040091

Abstract

Scoria aggregate concrete (SAC) as new green material has been gradually used in some construction projects for its lightweight and high strength, which can reduce the environmental impact of construction materials. In this paper, the residual mechanical properties and intact compressive stress–strain relationships of polypropylene (PP) fiber-reinforced Scoria aggregate concrete after high-temperature exposure at 20, 200, 400, 600, and 800 ◦C were investigated. The failure modes of PP fiber-reinforced Scoria aggregate concrete specimens and the effect of high temperatures on the peak stress, secant modulus, and peak strain were obtained. The results showed that the residual compressive strength of heated concrete is significantly reduced when the temperature exceeds 400 ◦C. The residual strength and residual secant modulus of PP fiber-reinforced Scoria aggregate concrete are significantly higher than those of ordinary concrete. The Scoria aggregate concrete specimens with PP fibers exhibited fewer surface cracks and fewer edge bursts under high temperatures. The residual stress–strain equation of the Scoria aggregate concrete was established by regression analysis, which agreed well with the experimental results.

Publication Type: Article
Additional Information: Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Publisher Keywords: Scoria aggregate concrete; PP fiber; high temperature; stress–strain curve
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Civil Engineering
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