主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
消防科学与技术

消防科学与技术 ›› 2020, Vol. 39 ›› Issue (2): 173-177.

• • 上一篇    下一篇

聚丙烯纤维对混凝土高温后性能的影响

刘晓仙，杜红秀   

  1. （太原理工大学土木工程学院，山西 太原 030024）
  • 收稿日期:2019-10-08 出版日期:2020-02-15 发布日期:2020-02-15
  • 通讯作者: 杜红秀，太原理工大学建筑与土木工程学院教授。
  • 作者简介:刘晓仙(1993-)，男，河北邯郸人，太原理工大学土木工程学院硕士研究生，主要从事混凝土材料及其火灾损伤检测研究，山西省太原市万柏林区迎泽西大街79号，030024。
  • 基金资助:
    国家自然科学基金项目“梯度热开裂-蒸汽压-荷载耦合作用下高性能混凝土缺陷演化研究”（51478290）

Effect of polypropylene fiber on the performance of concrete after high temperature

LIU Xiao-xian, DU Hong-xiu   

  1. (College Civil Engineering, Taiyuan University of Technology, Shanxi Taiyuan 030024, China)
  • Received:2019-10-08 Online:2020-02-15 Published:2020-02-15

摘要： 为研究聚丙烯纤维对C80高性能混凝土（简称“HPC”）的高温后劈拉强度的影响，对素C80HPC及掺加0.1%和0.2%的C80HPC进行高温试验，观察记录混凝土的爆裂情况，并对试件进行劈拉强度试验，利用红外热像仪检测C80HPC试件断面的红外温升，分析HPC的劈拉强度、红外温升与受火温度的关系。结果表明，在C80HPC中掺入0.1%的聚丙烯纤维可以抑制爆裂的发生；HPC的劈拉强度均随受火温度的升高而不断下降，掺入聚丙烯纤维会降低HPC的劈拉强度；建立的受火温度与红外平均温升、劈拉强度的回归方程可用于火灾后HPC的火灾温度、剩余强度的鉴定及后期建筑恢复。

关键词: 聚丙烯纤维, 高性能混凝土, 受火温度, 劈拉强度, 红外温升

Abstract: In order to study the effect of polypropylene fiber on the tensile strength of C80 high performance concrete (HPC) after high temperature, the high temperature test was carried out on C80HPC containing 0, 0.1% and 0.2% polypropylene fiber, and the cracking of concrete was observed and recorded. After the tensile strength test was carried out, the infrared temperature rise of the cross section of the C80 HPC was detected by infrared thermal imager. The relationship between the tensile strength of the HPC, the infrared temperature rise and the temperature of the fire was analyzed. The results show that the incorporation of 0.1% polypropylene fiber in C80 HPC can inhibit the occurrence of bursting; the tensile strength of HPC decreases with the increase of fire temperature, and the incorporation of polypropylene fiber will reduce the tensile strength of HPC. The established regression equation of fire temperature and infrared average temperature rise and tensile strength can be used to identify the fire temperature, residual strength and post-building recovery of HPC after fire.

Key words: polypropylene fiber, high performance concrete; fire temperature, tensile strength, infrared temperature rise