Given the degradation of mechanical properties in concrete under elevated temperature namely, tensile strength, modulus of elasticity, compressive strength, etc., what is the justification behind the increase of fracture energy with the rise in temperature? Needless to say, the so-called fracture energy is in direct correlation with tensile strength.
Many thanks for your reply S M Anas. However, don't you think the required energy to cause a tensile crack in a damaged concrete is considerably less than its intact counterpart? With this in mind, it seems a little bit odd and a relatively complex issue that the fracture energy value increases with temperature rather than decreasing.
Anyway, many thanks for your time and comment.
Because toughness of concrete increases with the temperature in the mentioned temperature range
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