Premium
Fracture monitoring and damage pattern recognition for carbon nanotube‐crumb rubber mortar using acoustic emission techniques
Author(s) -
Xu Jie,
Fu Zhengwu,
Han Qinghua,
Li Hongliang
Publication year - 2019
Publication title -
structural control and health monitoring
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.587
H-Index - 62
eISSN - 1545-2263
pISSN - 1545-2255
DOI - 10.1002/stc.2422
Subject(s) - carbon nanotube , materials science , acoustic emission , crumb rubber , composite material , mortar , fracture (geology) , ductility (earth science) , natural rubber , flexural strength , cracking , structural engineering , engineering , creep
Summary This article presents the results from an experimental study on the application of acoustic emission (AE) analysis to assess the strengthening effect of carbon nanotubes and monitoring the damage progression of carbon nanotube‐crumb rubber mortar (CNT‐CRM) under three‐point flexural tests. Normal cement mortar and CRM were also tested for the comparison with CNT‐CRM. The various AE statistical parameters were employed for the analysis, and the following conclusions were drawn: (a) The incorporation of carbon nanotubes can increase the strength and ductility of CRM. (2) The damage and fracture processes of CNT‐CRM can be well analyzed according to the double evaluation index of cumulative number of hits and cumulative energy. (3) Ib ‐value analysis can provide a good early warning of structural damage for CNT‐CRM. (4) The peak frequency and the average frequency can effectively distinguish the AE signals of different damage modes in CNT‐CRM. The results obtained in this article demonstrate that the AE technique can provide valuable information for a better understanding of micro‐cracking and fracture monitoring of CNT‐CRM.