Construction method of a predictive model for thermal expansion coefficient of fully graded large aggregate concrete in hardening stage

Abstract

The invention discloses a construction method for a thermal expansion coefficient prediction model of complete size grading large aggregate concrete in a hardening phase. According to the invention, the thermal expansion coefficient of the complete size grading large aggregate concrete in the hardening phase and a material composing the concrete are researched, the complete size grading large aggregate concrete can be treated as an aggregation of apertures, a mortar and a crude aggregate, and the thermal expansion coefficient of the complete size grading large aggregate concrete in the hardening phase is predicted according to thermal expansion coefficients of all components. The concrete construction method for the thermal expansion coefficient prediction model of the complete size grading large aggregate concrete in the hardening phase comprises steps of establishing a series model of the thermal expansion coefficient, establishing a parallel model of the thermal expansion coefficient, and establishing the thermal expansion coefficient model based on the series model and the parallel model. The prediction model can well characterize the law of the relation between the thermal expansion coefficient of the complete size grading large aggregate concrete and the thermal expansion coefficients of the materials.

Description

technical field [0001] The invention relates to a method for constructing the thermal expansion coefficient of fully graded large aggregate concrete in the hardening stage, and belongs to the field of concrete construction. Background technique [0002] Since the advent of concrete, it has become an irreplaceable building material, and its cracking has also become one of the important factors affecting the service conditions and service life of modern engineering structures. For fully graded large aggregate concrete, the huge volume prevents the internal heat of hydration from being dissipated in time during the hydration process, and the structural failure and durability problems caused by cracks in engineering are becoming more and more prominent. The important reason is that the coefficient of thermal expansion, as an important parameter to characterize this performance, has been paid more and more attention by industry scholars. [0003] At present, domestic and foreign...

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Problems solved by technology

For fully graded large aggregate concrete, due to the large volume of aggregates and specimens, it is difficult to measure its thermal expansion coefficient with existing technology and equipment, and its research model has not yet been proposed

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