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 ›› 2021, Vol. 40 ›› Issue (9): 1301-1304.

• • 上一篇    下一篇

高温后混凝土劈裂抗拉强度实验研究

周建超，陈海彬，王棒棒   

  1. 华北理工大学 河北省地震工程研究中心, 河北 唐山063021
  • 出版日期:2021-09-15 发布日期:2021-09-15
  • 作者简介:周建超（1994-），男，河北唐山人，华北理工大学建筑工程学院在读硕士，主要从事建筑结构抗火研究，河北省唐山市曹妃甸新城渤海大道21号，063021。
  • 基金资助:
    国家自然科学基金项目（51478162,51608196）；河北省自然科学基金项目（E2014209099，E2020209086）

Experimental study on splitting tensile strength of concrete after high temperature

ZHOU Jian-chao, CHEN Hai-bin, WANG Bang-bang   

  1. Earthquake Engineering Research Center of Hebei Province, North China University of Science and Technology, Hebei Tangshan 063021, China
  • Online:2021-09-15 Published:2021-09-15

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摘要： 为探究高温后混凝土劈裂抗拉强度变化，选取本地区常用的混凝土配合比，制作尺寸为100 mm×100 mm×100 mm的C30和C40两种强度等级的混凝土试块共156块，分别在受火时间60 min和90 min、自然冷却和喷水冷却、高温后静置1 d和14 d的不同工况下进行火灾实验，得到不同受火时间、不同冷却方式、不同静置时间、不同强度等级影响下的高温后混凝土劈裂抗拉强度，进一步分析了不同工况的影响程度，为高温后建筑结构或构件的鉴定评估和加固设计提供依据。

关键词: 高温, 混凝土强度, 受火时间, 静置时间, 冷却方式, 劈裂抗拉强度

Abstract: In order to explore the variation of the splitting tensile strength of concrete after high temperature, 156 pieces of C30 and C40 concrete blocks with the size of 100 mm×100 mm×100 mm were made by choosing the mix ratio of concrete commonly used in this area. The simulated fire tests were carried out under different conditions of 60 min and 90 min fire time, natural cooling and water spraying cooling, 1d and 14d standing after high temperature. The splitting tensile strength values of concrete specimens with different fire time, cooling methods, standing time and strength grade after high temperature were obtained. The influence degree of different working conditions was further analyzed, which provides the basis for the appraisal and reinforcement design of building structures or components after high temperature.

Key words: high temperature, concrete strength, fire time, standing time, cooling method, splitting tensile strength