论文部分内容阅读
本文研究了含湿量和纤维对高性能混凝土高温爆裂和高温后残余力学性能的影响。研究结果表明,含湿量是影响高性能混凝土高温爆裂的主要因素。高性能混凝土发生爆裂的温度范围是350~450℃,爆裂的临界含湿量为63%~75%。试件含湿量越高,试件爆裂的频率和损伤程度越大。单掺体积分数为0.05%的网状聚丙烯纤维或PVA纤维即可防止高性能混凝土发生高温爆裂,纤维掺量越高,高性能混凝土高温损伤程度越小。单掺网状聚丙烯纤维和PVA纤维改善了高性能混凝土高温后残余抗压强度、残余劈拉强度和残余断裂能。
In this paper, the effect of moisture content and fiber on residual mechanical properties of high performance concrete after burst at high temperature and high temperature was studied. The results show that the moisture content is the main factor affecting the high temperature burst of high performance concrete. High-performance concrete burst occurs in the temperature range of 350 ~ 450 ℃, the critical burst moisture content of 63% to 75%. The higher the moisture content of the specimen, the greater the frequency of the specimen burst and the degree of damage. The single polypropylene fiber or PVA fiber with the volume fraction of 0.05% can prevent the burst of high performance concrete at high temperature. The higher the fiber content, the less the high temperature damage of high performance concrete. The single mixed mesh polypropylene fiber and PVA fiber improve the residual compressive strength, residual splitting tensile strength and residual fracture energy of high performance concrete after high temperature.