Numeralization evaluation method for crack resistance of concrete

Abstract

The invention discloses a numeralization evaluation method for crack resistance of concrete. The numeralization evaluation method comprises the following steps: testing test data of a concrete test piece by using a temperature stress testing machine; calculating a crack-resisting security coefficient Kf and taking the crack-resisting security coefficient Kf as an evaluation criterion of the crack resistance of the concrete; substituting tested cracking stress and room-temperature stress into the calculation in the calculation of the Kf; and when the Kf is more than 1.15, showing that a concrete test piece to be tested has good crack resistance. The evaluation method can be used for rapidly obtaining a testing result, and the temperature sensibility and the restraint stress relaxation performance of the restricted concrete are evaluated by a ratio of the cracking stress to room-temperature stress, so that the cracking resistance of the concrete can be directly evaluated.

Description

technical field [0001] The invention relates to a test method for evaluating the anti-cracking performance of concrete by using a temperature stress test. The constrained concrete is cured under a specific temperature history and its thermodynamic performance is tested. The performance parameters are calculated and the anti-cracking performance index is calculated to evaluate the cracking sensitivity of concrete. Background technique [0002] For a long time, scholars at home and abroad have used various restraint test methods to study the early cracking sensitivity of concrete. However, due to many factors affecting the crack resistance of concrete, in addition to the early shrinkage deformation of concrete, there are mainly ultimate tensile values, axial Tensile strength, elastic modulus, linear expansion coefficient, hydration temperature rise, creep and other factors. Since the above factors are not independent of each other, but are interrelated and restricted, most of...

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Problems solved by technology

[0006] However, in actual engineering, concrete materials with high cementitious material content and high grades often have greater tensile strength and adiabatic temperature rise, resulting in greater cracking stress and higher cracking temperature. This is a comprehensive evaluation of which index to choose The crack resistance of concrete brings difficulties, and these two commonly used indicators are not conducive to the horizontal comparison of the crack resistance of different types of concrete

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