Fracture Mechanical Properties of Concrete Exposed on High Temperatures Based on DIC

doi:10.16552/j.cnki.issn1001-1625.2025.0257

Abstract

Abstract: Three-point bending fracture tests were conducted on notched concrete beams at different temperatures (20, 200, 400, 600 and 800 ℃), and the surface deformation field was observed using the digital image correlation(DIC) method. By defining a strain boundary threshold, the fracture process zone of concrete was identified. Based on fracture mechanics theory, the initial fracture toughness, unstable fracture toughness and fracture energy of concrete were calculated. The variation law of fracture properties with temperature was analyzed. The results indicate that as temperature increases, the fracture process zone appears earlier, and the stable crack propagation phase is extended. The growth rate of the fracture damage factor accelerates with rising temperature during the early loading stages and gradually slows down near the peak load, suggesting that elevated temperatures cause the fracture process of concrete to transition from brittle to ductile. Both the initial and unstable fracture toughness decrease gradually with increasing temperature. The fracture energy gradually increases from 200 ℃ to 600 ℃ due to enhanced ductility and post-peak deformation capacity of concrete at high temperatures, but it significantly decreases at 800 ℃ as a result of material decomposition.

Key words: concrete, high temperature, fracture property, fracture process zone, digital image correlation method

CLC Number:

TU528

WANG Lei, RAO Bin, ZHAO Yanru, XU Youjun, CHEN Ming. Fracture Mechanical Properties of Concrete Exposed on High Temperatures Based on DIC[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(9): 3196-3206.

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