论文名称：Influence of different fibers on the change of pore pressure of self-consolidating concrete exposed to fire
论文类型：期刊论文
发表刊物：CONSTRUCTION AND BUILDING MATERIALS
收录刊物：SCIE、EI
卷号：113
页面范围：456-469
ISSN号：0950-0618
关键字：Pore pressure; Spalling; Fire; Fibers; Self-consolidating concrete; Hybrid effect
摘要：The focus of this paper is given to investigate the effect of different fibers on the pore pressure of fiber reinforced self-consolidating concrete under fire. The investigation on the pore pressure-time and temperature relationships at different depths of fiber reinforced self-consolidating concrete beams was carried out. The results indicated that micro PP fiber is more effective in mitigating the pore pressure than macro PP fiber and steel fiber. The composed use of steel fiber, micro PP fiber and macro PP fiber showed clear positive hybrid effect on the pore pressure reduction near the beam bottom subjected to fire. Compared to the effect of macro PP fiber with high dosages, the effect of micro PP fiber with low fiber contents on the pore pressure reduction is much stronger. The significant factor for reduction of pore pressure depends mainly on the number of PP fibers and not only on the fiber content. An empirical formula was proposed to predict the relative maximum pore pressure of fiber reinforced self-consolidating concrete exposed to fire by considering the moisture content, compressive strength and various fibers. The suggested model corresponds well with the experimental results of other research and tends to prove that the micro PP fiber can be the vital component for reduction in pore pressure, temperature as well spalling of concrete. (C) 2016 Elsevier Ltd. All rights reserved.
发表时间：2016-06-15