Abstract
This paper reviews the methods for evaluation of strength and crack-resistance from the perspective of fracture mechanics and slow expansion of the most dangerous main cracks. Complete concrete stress-deformation and destruction diagrams with the fracture work and energy evaluation have been obtained through testing as well as the force parameter such as the critical stress intensity ratio has been determined. The analysis of test results has proved that crack-resistance of concrete can change depending on the type, size and volumetric content of the aggregate and also on the water-cement ratio, age, hardening conditions and heating temperature of concrete.
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