高温后纤维混凝土受压破坏力学及声发射特性研究

摘要/Abstract

摘要： 为探究温度、纤维类型对高温后混凝土单轴受压性能的影响,对普通混凝土、聚丙烯仿钢纤维混凝土、聚丙烯仿钢纤维-钢纤维混凝土试块进行不同温度(20、200、400和600 ℃)下单轴压缩试验,并使用声发射监测系统对混凝土受压破坏过程进行监测。根据声发射与单轴压缩试验得到的数据对混凝土在高温后的损伤行为进行分析。结果表明:混凝土受压破坏过程分为压密阶段、裂纹扩展阶段及失稳开裂阶段,对应的声发射过程分为接触期、缓增期和陡增期;不同温度下各试样的抗压强度损失率范围为9%~49%;通过对声发射信号定量分析可知聚丙烯仿钢纤维、聚丙烯仿钢-钢纤维的掺入可以降低混凝土200、400、600 ℃下的初始损伤。

关键词: 纤维混凝土, 聚丙烯仿钢纤维, 高温环境, 声发射, 阶段累积量占比

Abstract: In order to explore the effects of temperature and fiber type on uniaxial compression performance of concrete after high temperature, uniaxial compression tests were carried out on normal concrete, polypropylene imitation steel fiber and polypropylene imitation steel fiber-steel fiber reinforced concrete blocks at different temperatures (20, 200, 400 and 600 ℃), and the acoustic emission monitoring system was used to monitor the compression failure process of concrete. According to the test data obtained from acoustic emission and uniaxial compression test, the damage behavior of concrete after high temperature was analyzed. The results show that the compression failure process of concrete is divided into compaction stage, crack propagation stage and instability cracking stage, and the corresponding acoustic emission process is divided into contact stage, slow increase stage and sharp increase stage. The compressive strength loss rate of each sample at different temperatures ranges from 9% to 49%. Through quantitative analysis of acoustic emission signals, it is known that the incorporation of polypropylene imitation steel fiber and polypropylene imitation steel fiber-steel fiber can reduce the initial damage of concrete at 200, 400 and 600 ℃.

Key words: fiber reinforced concrete, polypropylene imitation steel fiber, high temperature environment, acoustic emission, proportion of stage cumulative amount

中图分类号:

TU528

王强, 王嘉成, 王南, 张伟, 徐东宇. 高温后纤维混凝土受压破坏力学及声发射特性研究[J]. 硅酸盐通报, 2025, 44(3): 915-923.

WANG Qiang, WANG Jiacheng, WANG Nan, ZHANG Wei, XU Dongyu. Compressive Failure Mechanics and Acoustic Emission Characteristics of Fiber Reinforced Concrete afterHigh Temperature[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(3): 915-923.

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