钢纤维再生粗骨料混凝土受压声发射特性与损伤演化

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (5) : 136-142.

论文

崔正龙，费海超，孙万吉，李正元

作者信息 +

Acoustic emission characteristics and damage evolution of steel fiber recycled coarse aggregate concrete under compression

CUI Zhenglong, FEI Haichao, SUN Wanji, LI Zhengyuan

Author information +

文章历史 +

摘要

为了探究钢纤维掺量（体积率0%、0.8%、1.5%）对C30再生粗骨料混凝土（质量分数取代率0%、100%）基本力学性能的影响，结合声发射特征参数和应力-应变曲线来描述钢纤维再生粗骨料混凝土在轴心受压过程中的损伤演化规律。试验结果表明，通过对声发射损伤定位、撞击计数与能量计数分析，可实现钢纤维再生粗骨料混凝土轴心受压破坏从累计损伤到微裂缝演变，再到宏观裂缝扩展的全过程动态监测，不同钢纤维掺量再生粗骨料混凝土与普通混凝土试件在加载过程中损伤点的密集集中位置与试件最终破坏位置相符；基于声发射累计撞击计数建立的混凝土损伤模型可用于分析钢纤维再生粗骨料混凝土的损伤演化规律。

Abstract

In order to explore the influence of steel fiber content ( volume rate 0 %, 0.8 %, 1.5 % ) on the basic mechanical properties of C30 recycled coarse aggregate concrete ( mass fraction replacement rate 0 %, 100 % ), the damage evolution law of steel fiber recycled coarse aggregate concrete during axial compression was described by combining acoustic emission characteristic parameters and stress-strain curve. The test results show that through the analysis of acoustic emission damage location, impact count and energy count, the dynamic monitoring of the whole process of axial compression failure of steel fiber recycled coarse aggregate concrete from cumulative damage to micro-crack evolution and then to macro-crack propagation can be realized. The concentrated location of damage points in the loading process of recycled coarse aggregate concrete and ordinary concrete specimens with different steel fiber contents is consistent with the final failure location of the specimens. The concrete damage model based on acoustic emission cumulative impact count can be used to analyze the damage evolution law of steel fiber recycled coarse aggregate concrete.

导出引用

崔正龙，费海超，孙万吉，李正元. 钢纤维再生粗骨料混凝土受压声发射特性与损伤演化[J]. 振动与冲击, 2023, 42(5): 136-142

CUI Zhenglong, FEI Haichao, SUN Wanji, LI Zhengyuan. Acoustic emission characteristics and damage evolution of steel fiber recycled coarse aggregate concrete under compression[J]. Journal of Vibration and Shock, 2023, 42(5): 136-142

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