[1]匡一达,姚志敏,边会婷,等.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(04):111-116.[doi:10.13705/ j.issn.1671-6833.2024.04.007]
　KUANG Yida,YAO Zhimin,BIAN Huiting,et al.Effect of Fire Extinguishing Agents on Compressive Strength and Splitting Tensile Strength of Concretes Exposed to High Temperatures[J].Journal of Zhengzhou University (Engineering Science),2024,45(04):111-116.[doi:10.13705/ j.issn.1671-6833.2024.04.007]
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灭火剂对高温混凝土抗压强度和劈拉强度的影响()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
45
期数:
2024年04期
页码:
111-116
栏目:
出版日期:
2024-06-16

文章信息/Info

Title:
Effect of Fire Extinguishing Agents on Compressive Strength and Splitting Tensile Strength of Concretes Exposed to High Temperatures
文章编号:
1671-6833(2024)04-0111-06
作者:
匡一达1;  姚志敏2;  边会婷1;  赵 军1;  李新喆1;  张丽娟1
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
Author(s):
KUANG Yida1;  YAO Zhimin2;  BIAN Huiting1;  ZHAO Jun1;  LI Xinzhe1;  ZHANG Lijuan1
1.School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China; 2.School of Mechanical Engineering, Zhengzhou University of Science and Technology, Zhengzhou 450064, China
关键词:
混凝土;  高温;  灭火剂;  抗压强度;  劈拉强度;  龄期;  烧失率
Keywords:
concrete;  high temperature;  fire extinguishing agents;  compressive strength;  splitting tensile strength;  curing age;  mass loss rate
分类号:
TU528.01
DOI:
10.13705/ j.issn.1671-6833.2024.04.007
文献标志码:
A
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。
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.

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更新日期/Last Update: 2024-06-14