（中国建筑科学研究院有限公司， 北京 100013）

［摘要］考虑自然冷却方式下，对不同高温以及持续不同时间后的钢筋连接用套筒灌浆料试块进行了抗折强度和抗压强度试验，并与常温下的试验结果进行对比。同时，应用SEM对试块进行了微观结构分析。结果表明，随着温度的升高，灌浆料试块内部孔洞数量逐渐增多，尺寸逐渐增大，凝胶体结构致密程度逐渐下降并出现裂缝和局部破碎，600℃高温处理后劣化最严重； 抗折强度和抗压强度均随温度的升高而下降，但抗压强度降低幅度小于抗折强度降低幅度。相同温度下，持续时间较长时，抗折强度则趋于稳定。试验结果可为装配式混凝土结构火灾后的性能评估提供参考依据。

［关键词］钢筋连接用套筒灌浆料； 高温； 耐火性能； 抗折强度； 抗压强度； 微观分析

中图分类号：TU398-7文献标识码：A文章编号：1002-848X(2020)22-0062-05

Experimental study on fire resistance of grouting material for sleeve of rebar splicing

JIN Qingbo, SUN Bin, ZHANG Jinfeng, WANG Wenzheng, ZHAO Yang

（China Academy of Building Research Co., Ltd., Beijing 100013, China）

Abstract:Considering the natural cooling method, the flexural strength and compressive strength tests were carried out on the test blocks for grouting material for sleeve of rebar splicing after different high temperatures and for different durations, and compared with the test results at room temperature. At the same time, SEM was applied to analyze the microstructure of the test blocks. The results showed that with the increase of temperature, the number of inner hole of the grouting test blocks increased gradually, the size gradually increases, the degree of densification of the gel structure gradually decreased and the cracks and partial failure occurred, the degradation is the most serious after 600℃. The flexural strength and compressive strength decreased with the increase of temperature, but the reduction of compressive strength is smaller than that of flexural strength. At the same temperature, when the duration is longer, the flexural strength tends to be stable. The test results can provide a basis for quality evaluation of prefabricated concrete structure after fire.

Keywords:grouting material for sleeve of rebar splicing; high temperature; fire resistance; flexural strength; compressive strength; microscopic analysis

*中国建筑科学研究院有限公司青年基金项目（20160112331030066）。

作者简介：金庆波，学士，高级工程师，Email:xiaobo147@163.com； 通信作者：孙彬，博士，研究员，Email:sunbinmail@163.com。