TY - JOUR
T1 - Acoustic emission analysis for the quantification of autonomous crack healing in concrete
AU - Van Tittelboom, Kim
AU - De Belie, Nele
AU - Lehmann, Frank
AU - Grosse, Christian U.
N1 - Funding Information:
Financial support from the Research Foundation Flanders (FWO-Vlaanderen) for this study (Project No. G.0157.08) is gratefully acknowledged. The authors would like to thank Willem De Muynck and Pieter Dejonghe for critically reading the manuscript and Nicolas Robeyst for his help with analysis of the AE data.
PY - 2012/3
Y1 - 2012/3
N2 - As half of the annual construction budget is spent on remediation of existing structures, self-healing of concrete, which is very sensitive to cracking, would be highly desirable. In this research, encapsulated healing agents were embedded in the concrete matrix in order to obtain self-healing properties. Upon cracking, the capsules break and the healing agent is released, resulting in crack repair. The efficiency of this crack healing technique was evaluated by means of mechanical tests and by using acoustic emission analysis. It was shown that due to autonomous crack repair, more than 80% of the original strength and stiffness can be regained. Events with an energy higher than the energy related to concrete cracking indicated breakage of the capsules. Upon reloading of beams with untreated cracks, the released energy was lower compared to beams with healed cracks. From this study it was shown that AE is a suitable technique to evaluate self-healing of cracks in concrete.
AB - As half of the annual construction budget is spent on remediation of existing structures, self-healing of concrete, which is very sensitive to cracking, would be highly desirable. In this research, encapsulated healing agents were embedded in the concrete matrix in order to obtain self-healing properties. Upon cracking, the capsules break and the healing agent is released, resulting in crack repair. The efficiency of this crack healing technique was evaluated by means of mechanical tests and by using acoustic emission analysis. It was shown that due to autonomous crack repair, more than 80% of the original strength and stiffness can be regained. Events with an energy higher than the energy related to concrete cracking indicated breakage of the capsules. Upon reloading of beams with untreated cracks, the released energy was lower compared to beams with healed cracks. From this study it was shown that AE is a suitable technique to evaluate self-healing of cracks in concrete.
KW - Ceramic tubes
KW - Mechanical properties
KW - Non-destructive testing
KW - Polymers
KW - Self-healing concrete
UR - http://www.scopus.com/inward/record.url?scp=80054118118&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2011.08.079
DO - 10.1016/j.conbuildmat.2011.08.079
M3 - Article
AN - SCOPUS:80054118118
SN - 0950-0618
VL - 28
SP - 333
EP - 341
JO - Construction and Building Materials
JF - Construction and Building Materials
IS - 1
ER -