Abstract
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.
Highlights
Fire poses one of the most serious risks to concrete for underground construction and above ground structure because it often results in explosive spalling of concrete
This paper presents an experimental study of the fiber effect on the pore pressure in SCC during fire exposure
The pore pressure development of plain SCC and FRSCC with various fibers during fire exposure will be analyzed
Summary
Fire poses one of the most serious risks to concrete for underground construction and above ground structure because it often results in explosive spalling of concrete. The other one is related to the thermo-hydral process (pore pressure theory), which is directly related to the mass transfer of vapor, water and air in the porous network. This thermo-hydral process will result in building up high pore pressures and pressure gradients, as shown in Fig. 1b [9]. This paper presents an experimental study of the fiber effect on the pore pressure in SCC during fire exposure. The study of pore pressure development leads to a better understanding of spalling in SCC and FRSCC during fire exposure. 3.5 billion df=18 μm Double duoform lf =45 mm df=0.74 mm Melting temperature (oC) —
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