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- Title
Effect of Fire Extinguishing Agents on Compressive Strength and Splitting Tensile Strength of Concretes Exposed to High Temperatures.
- Authors
KUANG Yida; YAO Zhimin; BIAN Huiting; ZHAO Jun; LI Xinzhe; ZHANG Lijuan
- 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 °C/ min and 10 °C / min heating rates, and then they were maintained at different constant temperatures of 200 °C, 400 °C, 600 °C and 800 °C 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 °C . 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 °C and 600 °C . However, water cooling treatment at 600 °C 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 °C, 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 °C. CO2 had no influence on the compressive strength and splitting tensile strength of concrete.
- Publication
Journal of Zhengzhou University: Engineering Science, 2024, Vol 45, Issue 4, p111
- ISSN
1671-6833
- Publication type
Article
- DOI
10.13705/j.issn.1671-6833.2024.04.007