Numeralization evaluation method for crack resistance of concrete

An evaluation method and technology for concrete, which is applied in the direction of testing the strength of materials by applying stable tension/compression, which can solve the problems of high cracking temperature, difficult crack resistance of concrete, and unfavorable crack resistance of concrete.

Active Publication Date: 2014-06-11
CCCC FOURTH HARBOR ENG INST +4
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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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  • Numeralization evaluation method for crack resistance of concrete
  • Numeralization evaluation method for crack resistance of concrete
  • Numeralization evaluation method for crack resistance of concrete

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Embodiment Construction

[0033] The numerical evaluation method of concrete crack resistance of the present invention comprises the following steps:

[0034] (A) Make the concrete mixture, pour it into the mold of the temperature stress testing machine to make the concrete specimen, and use the temperature stress testing machine to adjust the initial temperature of the concrete specimen to within the range of 20±3°C.

[0035] The temperature stress testing machine used in this article is the HYPY-II temperature stress testing machine of Beijing Hangyuan Pingyang Technology Development Co., Ltd., and other temperature stress testing machines with the same function and parameters can also be used.

[0036] (B) Set temperature stress test conditions

[0037] Test mode: adiabatic temperature rise mode; ambient temperature range 25±4°C; holding time 48h; cooling rate 2°C / h; step unit 0.8~1.3μm; constraint degree 100%.

[0038] The specific test process is as follows: after the test starts, the concrete st...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/18
Inventor 宋雪峰李超王胜年范志宏徐兆全
Owner CCCC FOURTH HARBOR ENG INST
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