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http://dx.doi.org/10.4334/JKCI.2011.23.3.321

A Study on the Residual Mechanical Properties of Fiber Reinforced Concrete with High Temperature and Load  

Kim, Young-Sun (Center for Fire Science and Technology, Tokyo University of Science)
Lee, Tae-Gyu (Dept. of Architectural Engineering, Chungnam National University)
Nam, Jeong-Soo (Dept. of Architectural Engineering, Chungnam National University)
Park, Gyu-Yeon (POSCO Engineering&Construction Co., Ltd.)
Kim, Gyu-Yong (Dept. of Architectural Engineering, Chungnam National University)
Publication Information
Journal of the Korea Concrete Institute / v.23, no.3, 2011 , pp. 321-330 More about this Journal
Abstract
Recently, the effects of high temperature and fiber content on the residual mechnical properties of high-strength concrete were experimentally investigated. In this paper, residual mechanical properties of concrete with water to cement (w/c) ratios of 0.55, 0.42 and 0.35 exposed to high temperature are compared with those obtained in fiber reinforced concrete with similar characteristics ranging from 0.05% to 0.20% polypropylene (PP) fiber volume percentage. Also, factors including pre-load levels of 20% and 40% of the maximum load at room temperature are considered. Outbreak time, thermal strain, length change, and mass loss were tested to determine compressive strength, modulus of elasticity, and energy absorption capacity. From the results, in order to prevent the explosive spalling of 50 MPa grade concretes exposed to high temperature, more than 0.05 vol. % of PP fibers is needed. Also, the cross-sectional area of PP fiber can influence the residual mechanical properties and spalling tendency of fiber reinforced concrete exposed to high temperature. Especially, the external loading increases not only the residual mechanical properties of concrete but also the risk of spalling and brittle failure tendency.
Keywords
residual mechanical properties; high temperature; pre-load; compressive behavior; polypropylene fiber;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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