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 ›› 2022, Vol. 41 ›› Issue (2): 191-196.

• • 上一篇    下一篇

高温后不同冷却方式下自密实混凝土力学性能研究

王连坤，蔡凯鹏，陈伟杰，唐 强   

  1. （五邑大学 土木建筑学院 ，广东 江门 529020）
  • 出版日期:2022-02-15 发布日期:2022-02-15
  • 作者简介:王连坤（1977-），男，五邑大学土木建筑学院土木工程系主任，副教授，主要从事钢结构、组合结构以及再生混凝土结构力学性能研究，广东省江门市蓬江区东成村22号，529020。
  • 基金资助:
    五邑大学学生创新创业项目（2019CX09）

Study on mechanical properties of self-compacting concrete under different cooling methods after high temperature

WANG Lian-kun, CAI Kai-peng, CHEN Wei-jie, TANG Qiang   

  1. (School of Civil Engineering and Architecture, Wuyi University, Guangdong Jiangmen 529020, China)
  • Online:2022-02-15 Published:2022-02-15

摘要： 对54个标准立方体和27个标准棱柱体C40自密实混凝土试件高温后，采用自然冷却和喷水冷却两种方式下的力学性能进行研究，并观察试块的表观特征及测量高温后损失率，结果表明：两种冷却方式下，500 ℃时混凝土试块的表观特征均发生显著变化；高温后质量损失率和峰值应变随温度升高而增大，弹性模量随温度升高而下降；试块的抗压强度、劈拉强度及轴心受压强度都呈现下降趋势，喷水冷却方式下3种强度更低。

关键词: 高温, 冷却方式, 质量损失率, 自密实混凝土, 力学性能

Abstract: The mechanical properties of 54 standard cubes and 27 standard prism C40 self-compacting concrete specimens under natural cooling and water spraying cooling after high temperature were studied, and the apparent characteristics of the specimen and the loss rate after high temperature were observed. The results show that the apparent characteristics of concrete blocks changed significantly at 500℃ under two different cooling methods. After high temperature, the mass loss rate and peak strain increased with the increase of temperature, and the elastic modulus decreased with the increase of temperature. The compressive strength, splitting tensile strength and axial compressive strength of the test block showed a downward trend under the two cooling methods, but these three strengths were lower under the water spraying cooling method.

Key words: high temperature, cooling method, rate of mass loss, self-compacting concrete, mechanical properties