Abstract
This paper carried out burst tests on the carbon and polyvinyl alcohol (PVA) fiber high-strength concrete specimens to investigate the effects of fiber type, fiber content, water content, heating rate and test specimen size on the burst, and the whole burst process of fiber-high concrete was photographed and recorded. The results indicated that fiber addition will improve the high temperature burst behavior of the high-strength concrete, and the performance of PVA is greatly different from that of carbon fiber. The water content and heating rate have little influence on the burst of the PVA test specimen, but they will greatly affect the carbon fiber test specimen. The size of the test specimen has a great influence on the burst. For the PVA concrete test specimen, the large size test specimen bursts on the surface; as for the carbon fiber test specimen, the large size test specimen delays the initial burst time, but the burst becomes fiercer.
Highlights
High-strength concrete possesses superb mechanical properties [1,2,3,4,5] and durability, which has been extensively applied in practical engineering [6,7]; it is likely to burst under high temperatures [8,9]
The burst-proof fibers can be classified into two categories based on the basic theory, namely, the high elastic modulus fiber dominated by steel fiber, which can be ascribed to the reinforcement, tensile strength and high thermal conductivity of steel fiber; the other type of fiber is the plastic fiber dominated by Polypropylene (PP) fiber, which can form the pore canal under high temperatures and can release the vapor pressure to alleviate the occurrence of bursts
Compared with the reference concrete, the compression strength of polyvinyl alcohol (PVA) fiber concrete was reduced by 11%, while that of carbon fiber concrete was elevated by 6.6%; at a fiber content of 0.6%, that of PVA fiber concrete was reduced by 17% compared with the reference concrete, while that of carbon fiber concrete was increased by 2% relative to the reference concrete
Summary
High-strength concrete possesses superb mechanical properties [1,2,3,4,5] and durability, which has been extensively applied in practical engineering [6,7]; it is likely to burst under high temperatures [8,9]. Some studies indicate that high-strength concrete is subject to bursting at the temperatures of 300–500 ◦ C [10,11,12,13,14,15], and scholars have proposed three theories, namely, vapor pressure theory [16,17,18], thermal stress theory [19] and temperature gradient theory [20,21], to explain the cause of bursting. The burst-proof fibers can be classified into two categories based on the basic theory, namely, the high elastic modulus fiber dominated by steel fiber, which can be ascribed to the reinforcement, tensile strength and high thermal conductivity of steel fiber; the other type of fiber is the plastic fiber dominated by Polypropylene (PP) fiber, which can form the pore canal under high temperatures and can release the vapor pressure to alleviate the occurrence of bursts. Scholar [24] studied the influence of PP fiber on the burst of high-strength concrete and discovered that a 0.2% volume content of PP fiber could avoid the occurrence of bursts, whereas ultrahigh-strength concrete with a 0.3% PP fiber content would burst under high temperatures, indicating the presence of a suitable zone in the plastic fiber content
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