Detection method for fire-resistant performance of reinforced concrete beam and fireproof detection method for fireproof coating

Abstract

The invention belongs to the technical field of engineering materials and discloses a detection method for fire-resistant performance of a reinforced concrete beam and a fireproof detection method fora fireproof coating. Difference of thermotechnical and mechanical performance at constant temperature and high temperature is acquired by researching the thermotechnical and mechanical performance ofconcrete and reinforcing steel bars of an RC beam and analyzing high-temperature adhesive property of concrete and reinforcing steel bars. Obtained related conclusions in researching the fire-resistant performance of the RC beam provided with the fireproof coating on the surface have certain guiding meaning in structural element design and reinforcement after fire. By applying a SQW-A material high-temperature strength tester, the compressive strength of a concrete member provided with the fireproof coating on the surface reaches 15.81 MPa which is far greater than that (only 10.78 MPa) of the concrete member without the fireproof coating. Therefore, the fireproof action of concrete is improved by the fireproof coating arranged on the surface of the concrete.

Description

technical field [0001] The invention belongs to the technical field of engineering materials, and in particular relates to a method for detecting fire resistance of reinforced concrete beams and a method for detecting fire resistance of fireproof coatings. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] The research on fire resistance of reinforced concrete structures started relatively late in China. Zhu Bolong, Lu Zhoudao, and Li Jigeng conducted a relatively comprehensive study on the high-temperature performance of steel bars and concrete materials, and the fire resistance of reinforced concrete members and structures, which greatly promoted the research on the fire resistance of reinforced concrete structures in my country. [0004] my country established the State Key Laboratory of Fire Science at the University of Science and Technology of China in 1989, and then the former General Research I...

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Problems solved by technology

[0008] In the prior art, there is no analysis and calculation of the strength and deformation laws of reinforced concrete members at high temperatures, and the temperature field of RC beams under high temperature fires, and it is impossible to protect the concrete structures in fire with fire-resistant coatings

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