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Recycled concrete damage evolution model based on acoustic emission parameters and establishment method thereof

A technology of recycled concrete and damage evolution, which is applied in the direction of material analysis using acoustic wave emission technology, processing detection response signals, and material analysis using sound waves/ultrasonic waves/infrasonic waves, etc.

Inactive Publication Date: 2020-12-15
SHANDONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application of acoustic emission technology in the damage evolution analysis process of recycled concrete needs further research

Method used

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  • Recycled concrete damage evolution model based on acoustic emission parameters and establishment method thereof
  • Recycled concrete damage evolution model based on acoustic emission parameters and establishment method thereof
  • Recycled concrete damage evolution model based on acoustic emission parameters and establishment method thereof

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Embodiment

[0064] A damage evolution model and analysis method for recycled concrete based on acoustic emission parameters, comprising the following steps:

[0065] Step 1. Under a certain load, the initial defects inside the material will cause micro-cracks and micro-pores to continuously spread and melt, thereby reducing the mechanical properties of the material. This change in the microstructure leads to the degradation of the macroscopic properties of the material. In order to describe the damage, the damage parameter D is defined, and the calculation formula of the damage parameter D is as follows:

[0066]

[0067] where β is the overall performance parameter of the material, is the effective area, A d is the damage area, and A is the total area.

[0068] refer to figure 1 , Recycled concrete exhibits similar acoustic emission characteristics to ordinary concrete during loading, and they all go through the compaction stage, elastic stage, plastic stage and failure stage. At...

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Abstract

The invention discloses a recycled concrete damage evolution model based on acoustic emission parameters and an establishment method thereof. The evolution model is represented as follows in the specification, wherein D is a component damage parameter, the value range of D is 0-1, when D=0, the component is in a nondestructive state, and the greater the D value is, the greater the damage is, and when D=1, the complete damage of the component is represented; wherein Nm is the number of AE accumulated events when the nondestructive material is completely damaged; C is an integral constant; sigmais a relative stress level; and a and b are experimental parameters. The compressive failure process of the recycled concrete is studied, the influence of the replacement rate of the recycled coarseaggregate on the compressive failure process of the recycled concrete component is reflected, and a new way is provided for internal damage analysis of compressive failure of the recycled concrete component.

Description

technical field [0001] The invention belongs to the technical field of acoustic emission non-destructive monitoring, in particular to a damage evolution model of recycled concrete based on acoustic emission parameters and a method for establishing the same. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] As the largest man-made material, concrete has a great negative impact on both the occupation of natural resources and the environment. The amount of waste concrete demolished every year in the world, waste concrete produced by new buildings, and waste concrete discharged from concrete factories and prefabricated component factories is huge. Recycled concrete technology ...

Claims

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Application Information

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IPC IPC(8): G01N29/14G01N29/44
CPCG01N29/14G01N29/4472G01N2291/0232
Inventor 颜士荣王炳雷褚凤明蒋桂鹏黄天雨
Owner SHANDONG UNIV
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