通过28组126个砂浆试件不同受火时间后抗压强度的试验,研究了砂浆抗压强度随温度升高的变化规律。研究表明,不同种类不同强度砌筑砂浆抗压强度下降程度基本相近。按照ISO 834受火45min时,砂浆抗压强度下降至常温时的24.1%～30.4%,低于CECS 252∶2009《火灾后建筑结构鉴定标准》的相关数值。 Through the test of compressive strength of 126 mortar specimens of 28 groups after different fire time, the changing law of compressive strength of mortar with temperature was studied. The research shows that the compressive strength of different types of masonry mortar with different strength is almost the same. According to ISO 834 when exposed to fire for 45 min, the compressive strength of mortar decreased to 24.1% ~ 30.4% at normal temperature, lower than the CECS 252: 2009 “Fire Building Identification Standards.”