Fracture toughness of concretes at high temperature
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The fracture toughness of ordinary and refractory concretes in the range of 20–1300‡C was investigated, and the stress intensity factor, KIc, 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 KIc 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, KIc has a value of 0.043 MNm−3/2 for ordinary concrete, and for the refractory concrete at 1300‡C, KIc=0.34 MNm−3/2. The method presented for predicting the behaviour of concrete at high temperature may be used in engineering practice.
KeywordsPolymer Fracture Toughness Stress Intensity Intensity Factor Stress Intensity Factor
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