Abstract
The fracture toughness of ordinary and refractory concretes in the range of 20–1300‡C was investigated, and the stress intensity factor, K Ic, on three-point bent specimens (according to ASTM E-399 recommendation) determined. With an increase in testing temperature, the stress intensity factor decreases for both concretes. The values of K Ic at 20‡C for both concretes are comparable, being equal to 0.64 MNm−3/2 for ordinary concrete, and 0.72 MNm−3/2 for refractory concrete, respectively. At 1100‡C, K Ic has a value of 0.043 MNm−3/2 for ordinary concrete, and for the refractory concrete at 1300‡C, K Ic=0.34 MNm−3/2. The method presented for predicting the behaviour of concrete at high temperature may be used in engineering practice.
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References
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Prokopski, G. Fracture toughness of concretes at high temperature. Journal of Materials Science 30, 1609–1612 (1995). https://doi.org/10.1007/BF00375272
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DOI: https://doi.org/10.1007/BF00375272