Method and equipment for quantitatively evaluating cracking risk of concrete structure indoors

Abstract

The invention provides a method and equipment for quantitatively evaluating the cracking risk of a concrete structure indoors. Namely, two metal template frames with the same structure are arranged in a variable temperature chamber, one metal template frame is hollow, and the other metal template frame is used for pouring a concrete test piece; strain gauges are pasted at the centers of the top surfaces of the two metal template frames; the temperature of the variable temperature chamber is adjusted, the internal temperature of the concrete structure in the on-site pouring process is simulated, concrete is poured into one of the metal template frames according to the on-site concrete structure pouring process, and in the pouring process, under different age periods of a concrete test piece at different internal temperatures through a strain gauge and a strain acquisition instrument, deformation of the metal formwork frame with the hollow interior and the metal formwork frame with the concrete test piece poured inside are obtained in real time; a concrete test piece constraint stress curve is drawn; and whether the concrete test piece has a cracking risk or not isdirectly evaluated according to the drawn concrete test piece constraint stress curve.

Description

technical field [0001] The invention relates to a method and test equipment for assessing whether there is a risk of cracking in a concrete structure. Specifically, the invention relates to a method and test equipment for indoor quantitative assessment of whether there is a risk of cracking in a concrete structure in consideration of the temperature effect inside the concrete. Background technique [0002] During the pouring process of a concrete structure (such as a concrete dam), due to its thick section, the heat generated by its internal hydration reaction cannot be dissipated in time, resulting in a rapid rise in the temperature inside the concrete structure. When there is a large temperature difference between the internal temperature of the concrete structure and the external temperature of the concrete structure, especially when the temperature rise inside the concrete structure reaches a peak value, the temperature drop process inside the concrete structure begins to...

AI Technical Summary

Problems solved by technology

However, it often occurs that the concrete section at the pre-embedded rod is weakened, resulting in cracking of the concrete at the section, and the measured data is inaccurate, which makes the final analysis and evaluation results inaccurate

[0007] 3. In order to simulate the arbitrary temperature history of the concrete specimen, it is necessary to install corresponding temperature templates around the specimen to meet the temperature control requirements and increase the complexity of the test equipment

[0008] 4. The current temperature stress testing machine and other similar equipment used in the test need to be equipped with servo motors and supporting measurement and control software, which is expensive and inconvenient for the promotion and use of such equipment

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