Adamczak-Bugno Anna, Lipiec Sebastian, Adamczak Jakub, Vičan Josef, Bahleda František
Faculty of Civil Engineering and Architecture, Kielce University of Technology, Av. 1000-An. of Polish State 7, 25-314 Kielce, Poland.
Faculty of Mechatronics and Mechanical Engineering, Kielce University of Technology, Av. 1000-An. of Polish State 7, 25-314 Kielce, Poland.
Materials (Basel). 2023 Oct 20;16(20):6786. doi: 10.3390/ma16206786.
This article presents the results of tests conducted to identify the failure process and evaluate the deformation of axially compressed concrete specimens modified with polypropylene fibers (PP). The test specimens were previously stored at ambient temperature and subjected to fire temperatures of 300 °C, 450 °C, and 600 °C. Acoustic emission (AE) signals were recorded during loading, along with force and strain measurements. The recorded AE signals were analyzed using the k-means clustering method. The compilation of the test results made it possible to determine the classes of signals characteristic of different stages of the material failure process and to indicate the differences in the failure mechanisms of specimens stored under ambient conditions and subjected to fire temperatures. Digital image correlation (DIC) measurements were conducted during the strength tests. A numerical model of the material (FEM) was also prepared, and a comparison of the obtained results was carried out.
本文介绍了为识别轴向受压聚丙烯纤维（PP）改性混凝土试件的破坏过程并评估其变形而进行的试验结果。试验试件预先在环境温度下储存，然后分别承受300℃、450℃和600℃的火灾温度。在加载过程中记录声发射（AE）信号，同时测量力和应变。使用k均值聚类方法对记录的AE信号进行分析。试验结果的汇总使得确定材料破坏过程不同阶段的信号类别成为可能，并指出了在环境条件下储存和承受火灾温度的试件破坏机制的差异。在强度试验期间进行了数字图像相关（DIC）测量。还建立了材料的数值模型（有限元法），并对所得结果进行了比较。
