The paper presents a new method for identifying the form and intensity of spalling using an analysis of the acoustic signal emitted by concrete. To assess the intensity and monitor the course of concrete spalling during fire exposure, the analysis of the recorded sound from the furnace chamber is used. The spalling intensity was determined based on signal amplitude analysis. Investigation of sound records showed that the character of spalling can be categorized by a well-defined frequency value. Based on the analysis of the Fast Fourier Transform (FFT) spectrum, the authors have distinguished the following phenomena that are the source of the signal by assigning the corresponding frequency of the sound wave vibration: explosive spalling, aggregate spalling and destructive spalling.

本文提出了一种通过分析混凝土发出的声学信号来识别剥落形式和强度的新方法。为了评估强度并监测火灾暴露期间混凝土剥落的过程，使用了对来自炉膛的记录声音的分析。基于信号幅度分析确定剥落强度。对声音记录的调查表明，剥落的特征可以通过明确定义的频率值进行分类。作者通过对快速傅里叶变换（FFT）频谱的分析，通过分配相应的声波振动频率，区分了以下作为信号来源的现象：爆炸性剥落、聚集剥落和破坏性剥落。