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通过对聚丙烯-钢纤维增强高强混凝土(混杂纤维/高强混凝土)试块的高温试验,研究不同目标温度后混凝土表观特征、高温爆裂、质量损失及力学性能。结果表明:高强混凝土在600℃时发生爆裂,混杂纤维/高强混凝土直至800℃未出现爆裂,混杂纤维有效抑制了高强混凝土的高温爆裂。混杂纤维/高强混凝土的质量损失随所受温度的升高而增大,其抗压强度、抗折强度随温度的升高而降低,并且400℃以后显著降低。相同温度下,混杂纤维的加入提高了高强混凝土高温后强度。通过对试验结果的统计分析,分别建立了混杂纤维混凝土质量损失、抗压强度和抗折强度随温度变化的关系式。
Through the high temperature experiments of polypropylene-steel fiber reinforced high-strength concrete (hybrid fiber / high-strength concrete) test blocks, the apparent characteristics, high temperature burst, mass loss and mechanical properties of concrete after different target temperatures were studied. The results show that the high-strength concrete burst at 600 ℃, the hybrid fiber / high-strength concrete does not burst until 800 ℃, and the hybrid fibers effectively suppress the high-temperature burst of the high-strength concrete. The mass loss of hybrid fiber / high-strength concrete increases with the increase of temperature, and its compressive strength and flexural strength decrease with the increase of temperature, and the mass loss decreases significantly after 400 ℃. The same temperature, the hybrid fiber added to improve the strength of high-strength concrete after high temperature. Through the statistical analysis of the test results, the relationship between the mass loss, compressive strength and flexural strength of the hybrid fiber concrete with temperature is established respectively.