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.
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