基于非线性超声技术的热损伤混凝土微裂纹检测实验研究

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (5) : 126-135.

论文

许颖，张何勇，王青原

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Microcrack detection tests of thermal damage concrete based on nonlinear ultrasonic technology

XU Ying, ZHANG Heyong, WANG Qingyuan

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文章历史 +

摘要

混凝土结构在受热或者火灾作用后其内部极易形成微裂纹，这将严重影响混凝土的耐久性与强度等特性。基于非线性声场调制理论，提出边带峰计数法及损伤指标概念，以评估热损伤混凝土微裂纹的发展。通过高温制备热损伤混凝土，对热损伤混凝土微裂纹的检测结果表明，损伤指标会随微裂纹的发展而增大，与理论研究吻合。证明了非线性声场调制法的可行性，并引入非线性声场共振法进行对比实验，分析了调制法的优越性。并对不同水灰比、骨料比与升温速率的热损伤混凝土微裂纹的检测实验发现，损伤指标峰值会随混凝土水灰比或骨料比的增大而增大，缓慢升温方式对混凝土的损伤较快速升温方式大，并建立起了残余强度与损伤指标峰值之间的关系，为混凝土材料的热损伤评估奠定基础。

Abstract

Micro-cracks are easy to form in concrete structure after heating or fire, which will seriously affect the durability and strength of concrete. Based on the theory of nonlinear acoustic field modulation, the side band peak counting method and the concept of damage index are proposed to evaluate the development of thermal damaged concrete micro-cracks. Through the preparation of heat damaged concrete at high temperature, the detection results of micro-cracks in heat damaged concrete show that the damage index will increase with the development of micro-cracks, which is consistent with the theoretical research. The feasibility of the nonlinear field modulation method is proved, and the advantages of the modulation method are analyzed by introducing the nonlinear field resonance method for comparative experiments. It is found that the peak value of damage index will increase with the increase of water cement ratio or aggregate ratio of concrete, and the damage index peak value of concrete will increase with the increase of water cement ratio or aggregate ratio of concrete, and the damage index peak value of concrete will increase with the increase of water cement ratio or aggregate ratio of concrete, and the relationship between residual strength and damage index peak value will be established for the evaluation of thermal damage of concrete materials fixed foundation.

导出引用

许颖，张何勇，王青原. 基于非线性超声技术的热损伤混凝土微裂纹检测实验研究[J]. 振动与冲击, 2021, 40(5): 126-135

XU Ying, ZHANG Heyong, WANG Qingyuan. Microcrack detection tests of thermal damage concrete based on nonlinear ultrasonic technology[J]. Journal of Vibration and Shock, 2021, 40(5): 126-135

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