Effect of Fire Extinguishing Agents on Compressive Strength and Splitting Tensile Strength of Concretes Exposed to High Temperatures

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Effect of Fire Extinguishing Agents on Compressive Strength and Splitting Tensile Strength of Concretes Exposed to High Temperatures

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[1]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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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 45 Number of periods: 2024 04 Page number: 111-116 Column: Public date: 2024-06-16

Title:: Effect of Fire Extinguishing Agents on Compressive Strength and Splitting Tensile Strength of Concretes Exposed to High Temperatures

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

Keywords:: concrete; high temperature; fire extinguishing agents; compressive strength; splitting tensile strength; curing age; mass loss rate

CLC:: TU528.01

DOI:: 10.13705/ j.issn.1671-6833.2024.04.007

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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Last Update: 2024-06-14