高强混凝土受火后力学性能变化规律的研究  

MECHANICAL PROPERTIES OF HIGH-STRENGTH CONCRETE AFTER FIRE

作　　者：李敏[1] 钱春香[1] 王珩[1] 游有鲲[1] 孙伟[1] 

机构地区：[1]东南大学材料科学与工程系,南京210096

出　　处：《硅酸盐学报》2003年第11期1116-1120,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(59938130);江苏省自然科学基金(BK99016)。

摘　　要：对受火后的混凝土试件进行了抗压强度、抗折强度和劈裂抗拉强度试验,讨论了温度、强度等级、试件尺寸、含水量对其高温后力学性能的影响。研究表明,受火后,抗折强度较抗压强度下降更快;高强度的混凝土在600℃前抗压强度下降不多;大尺寸混凝土试件较小尺寸混凝土试件的残余抗压强度下降慢;混凝土试件的含水率越高,相对残余抗压强度越低。采用超声波速度法和质量损失法对火灾高温后混凝土内部结构的变化进行了探讨。Compressive strength, bending strength and splitting strength of a high-strength concrete after fire were investigated. The effects of temperature, strength grade, specimen size and water content on the mechanical properties of the concrete after fire were discussed. Results show that the loss of bending strength after fire is more considerable in comparison to that of compressive strength after fire. The compressive strength of the concrete decreases slightly before 600°C. The decrease in the remainder compressive strength of the big-size concrete is more less than that of the small-size concrete. The higher the water content percent is, the lower the relative remainder compressive strength of the concrete will be. The internal structure of the concrete after fire was also examined by the ultrasonic velocity method and the mass loss method.

关 键 词：高强混凝土 抗压强度 抗折强度 劈裂抗拉强度 超声波速度 受火 力学性能 

分 类 号：TU528.01[建筑科学—建筑技术科学]