Open AccessDamage classification in concrete, mortar and cement-paste beams under bending by Acoustic Emission Technique (AET)
Author(s) -
Tam Nguyen-Tat
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/869/7/072007
Subject(s) - acoustic emission , mortar , materials science , bending , structural engineering , cement , shear (geology) , ultimate tensile strength , mode (computer interface) , acoustics , composite material , computer science , engineering , physics , operating system
In concrete, AET has been used to characterize the different fracture modes in flex-ural beams by RA method (described in RILEM TC 212 ACD recommendation). In this study, three-point-bending tests have been conducted on cement-based specimens (concrete, mortar and cement-paste) to promote tensile mode and/or shear mode in these specimens. Acoustic Emission (AE) raw data were filtered to remove noise from signals. Then, k -means algorithm, as a Pattern Recognition Analysis (PRA) method, was used to identify the similarities within the recorded signals and to classify the filtered-signals into groups. Clustering results by k -means according to a proposed process have proven efficiency in providing information on RA, AF, Rise-time, Duration and Absolute Energy (ABEN) related to mode I and mode II. Then, two damage classification techniques were used, in which RA method was applied to filtered signals. By these techniques, the proportion of mode I and II was specified and the location of demarcation line also fixed.