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为确保混凝土结构的抗火性,对普通强度高性能混凝土高温性能进行试验,探讨普通强度高性能混凝土的高温爆裂与力学性能。结果表明,普强高性能混凝土与高强高性能混凝土类似,湿含量和密实度是影响其高温爆裂的主要因素。当湿含量超过临界值时,爆裂几率随湿含量上升而增大;混凝土越密实,爆裂越严重。体积分数0.05%的聚丙烯纤维可防止普强高性能混凝土发生高温爆裂,纤维掺量越高,高温损伤程度越小。聚丙烯纤维对残余力学性能有一定的改善作用。
In order to ensure the fire resistance of concrete structure, the high temperature performance of ordinary high strength concrete was tested, and the high temperature burst and mechanical properties of ordinary high strength concrete were discussed. The results show that the high-performance concrete is similar to the high-strength and high-performance concrete. The moisture content and the density are the main factors affecting the high-temperature burst. When the moisture content exceeds the critical value, the burst probability increases with the increase of moisture content; the more dense the concrete, the more serious the burst. The polypropylene fiber with volume fraction of 0.05% can prevent burst of high-performance concrete at high temperature. The higher the fiber content is, the lower the degree of high-temperature damage is. Polypropylene fiber to improve the residual mechanical properties of a certain extent.