Method for evaluating compressive failure and damage of recycled concrete based on acoustic emission rate process theory

Abstract

The invention discloses a method for evaluating compressive failure and damage of recycled concrete based on an acoustic emission rate process theory. The method comprises the following steps: applying axial compressive load to a recycled concrete member, synchronously measuring acoustic emission signals of the member and stress strains generated by the member, fitting a scatter diagram of the stress level and the acoustic emission cumulative event number of the recycled concrete, establishing a mathematical model of the stress level and the acoustic emission cumulative event number of the recycled concrete, and deriving the model to obtain a probability density function of the acoustic emission cumulative event number, then integrating to obtain a compressive failure and damage evolutionmodel, establishing the relationship between an elastic modulus change value and polynomial parameters, and evaluating the damage degree of the recycled concrete according to the initial damage amountof the recycled concrete. According to the method, a mathematical method and an acoustic emission theory are combined, the damage degree of the recycled concrete is evaluated by utilizing the methodfor evaluating compressive failure and damage of recycled concrete based on acoustic emission rate, the structural damage can be well evaluated, and a new approach is provided for the health monitoring and disaster early warning of the reinforced concrete structure.

Description

technical field [0001] The invention belongs to the technical field of acoustic emission monitoring, and in particular relates to a compression damage evaluation method for recycled concrete based on the acoustic emission rate process theory. Background technique [0002] As a building material with excellent performance, concrete is widely used in the construction industry and plays an important role in the construction and development of society. However, the production of concrete requires a large amount of raw materials such as stone, and these raw materials will eventually be exhausted with the increasing use of concrete. As an emerging building material, recycled concrete not only solves the current shortage of resources, but also solves the problem of difficult construction waste disposal. However, the mechanical performance and failure mechanism of recycled concrete are different from ordinary concrete due to the original mortar that wraps coarse aggregate. Therefor...

AI Technical Summary

Problems solved by technology

However, the current research on the application of acoustic emission technology in the damage evaluation of recycled concrete is still insufficient.

At the same time, the damage assessment method combining the rate process theory and damage mechanics of recycled concrete materials needs further research.

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