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

作　　者：匡一达 姚志敏 边会婷[1] 赵军[1] 李新喆 张丽娟[1] KUANG Yida;YAO Zhimin;BIAN Huiting;ZHAO Jun;LI Xinzhe;ZHANG Lijuan(School of Mechanics and Safety Engineering,Zhengzhou University,Zhengzhou 450001,China;School of Mechanical Engineering,Zhengzhou University of Science and Technology,Zhengzhou 450064,China)

机构地区：[1]郑州大学力学与安全工程学院,河南郑州450001 [2]郑州科技学院机械工程学院,河南郑州450064

出　　处：《郑州大学学报（工学版）》2024年第4期111-116,124,共7页Journal of Zhengzhou University（Engineering Science）

基　　金：国家自然科学基金资助项目(51906227);河南省科技攻关项目(222102320049)。

摘　　要：为了研究不同灭火剂对高温混凝土力学性能的影响,以5℃/min和10℃/min升温速率将不同龄期的混凝土在高温炉里进行加热,分别在200、400、600、800℃下维持恒温1 h,测试了不同龄期和不同加热温度下试件的质量损失率。随后将混凝土试块放置于钢化玻璃箱体中,分别使用水、二氧化碳、哈龙1211、七氟丙烷作为灭火剂进行冷却,冷却至室温后,测试不同灭火剂处理后混凝土试块的抗压强度和劈拉强度。结果表明:龄期对烧失率的影响主要体现在400℃加热条件下,7 d和14 d养护龄期试块的烧失率大于28 d养护龄期试块的烧失率;常温下灭火剂不影响试块的抗压强度,400℃和600℃时水、哈龙1211和七氟丙烷会使试块抗压强度降低;对于养护龄期为7 d和14 d的试块,水冷处理在600℃条件下会使试块抗压强度升高,分别升高了9.14%和9.18%,龄期并不影响哈龙1211和七氟丙烷的试验结果;加热温度为800℃时,试块高温后抗压强度较低,不能体现不同处理方式对试块抗压强度的影响;400℃下水、哈龙1211和七氟丙烷会使混凝土劈拉强度降低;二氧化碳对高温混凝土抗压强度和劈拉强度的影响可以忽略。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 significantly 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 

分 类 号：TU528.01[建筑科学—建筑技术科学]