郑州大学学报（工学版）2024，Vol.45Issue(4)：111-116,124,7.DOI:10.13705/j.issn.1671-6833.2024.04.007
灭火剂对高温混凝土抗压强度和劈拉强度的影响
Effect of Fire Extinguishing Agents on Compressive Strength and Splitting Tensile Strength of Concretes Exposed to High Temperatures
摘要
Abstract
To study the influences of fire extinguishing agents on the mechanical performance of concretes after high temperatures,specimens of different curing ages were heated to different temperatures at 5℃/min and 10℃/min heating rates,and then they were maintained at different constant temperatures of 200℃,400℃,600℃and 800℃for one hour.The mass loss rate of specimens of different curing ages and heating temperatures were tested.Specimens were moved into a tempered glass frame.Water,Halon 1211,CO2 and HFC-227ea were used to treat these specimens.The results showed that the mass loss rates of the specimen with 7 d and 14 d curing age were sig-nificantly higher than that in 28 d curing age at 400℃.Fire extinguishing agents did not affect the compressive strength of the specimens at room temperature.Water,Halon 1211,and HFC-227ea could reduce compressive strength of the specimens after high temperature treatment at 400℃and 600℃.However,water cooling treatment at 600℃could increase the compressive strength of the specimen with 7 d and 14 d curing age by 9.14%and 9.18%.Curing age did not affect the experimental results of Halon 1211 and HFC-227ea,and the compressive strength of the specimen was relatively low at 800℃,which could not reflect the influence of different treatment methods on the compressive strength.Water,Halon 1211,and HFC-227ea fire extinguishing agents could reduce the splitting tensile strength of concrete at 400℃.CO2 had no influence on the compressive strength and splitting tensile strength of concrete.关键词
混凝土/高温/灭火剂/抗压强度/劈拉强度/龄期/烧失率Key words
concrete/high temperature/fire extinguishing agents/compressive strength/splitting tensile strength/curing age/mass loss rate分类
建筑与水利引用本文复制引用
匡一达,姚志敏,边会婷,赵军,李新喆,张丽娟..灭火剂对高温混凝土抗压强度和劈拉强度的影响[J].郑州大学学报（工学版）,2024,45(4):111-116,124,7.基金项目
国家自然科学基金资助项目(51906227) （51906227）
河南省科技攻关项目(222102320049) （222102320049）
