TY - JOUR
T1 - Analysis of cracking in high-strength cementitious materials under heating and re-curing using X-ray CT
AU - Henry, Michael
AU - Darma, Ivan Sandi
AU - Haraguchi, Yuto
AU - Sugiyama, Takafumi
N1 - Funding Information:
This research was partially supported by the Japan Society for the Promotion of Science (Research no. 23360187).
Publisher Copyright:
© 2013 Sustainable Construction Materials and Technologies. All rights reserved.
PY - 2013
Y1 - 2013
N2 - The healing of cracks formed during high temperature exposure plays an important role in the performance recovery of concrete damaged by fire, but it is necessary to better understand the cracking behavior under heating and re-curing. This research applied X-ray microtomography and image analysis techniques to non-destructively examine the internal microstructure of high-strength cementitious materials and to clarify the changes in crack characteristics due to heating and water re-curing. Results showed that, in cement paste, radial cracks formed during heating due to shrinkage by dehydration and these cracks grew larger and new cracks formed during re-curing due to expansion by rehydration. In concrete, cracks formed around aggregates due to incapability in thermal expansion, but water re-curing reduced the total crack space. Better crack recovery in concrete relative to cement paste may be due to the lower cement content and the restraining effect of aggregates.
AB - The healing of cracks formed during high temperature exposure plays an important role in the performance recovery of concrete damaged by fire, but it is necessary to better understand the cracking behavior under heating and re-curing. This research applied X-ray microtomography and image analysis techniques to non-destructively examine the internal microstructure of high-strength cementitious materials and to clarify the changes in crack characteristics due to heating and water re-curing. Results showed that, in cement paste, radial cracks formed during heating due to shrinkage by dehydration and these cracks grew larger and new cracks formed during re-curing due to expansion by rehydration. In concrete, cracks formed around aggregates due to incapability in thermal expansion, but water re-curing reduced the total crack space. Better crack recovery in concrete relative to cement paste may be due to the lower cement content and the restraining effect of aggregates.
KW - Cracking
KW - Fire damage
KW - High-strength concrete
KW - Water re-curing
KW - X-ray CT
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M3 - Conference article
AN - SCOPUS:85008637493
SN - 2515-3048
VL - 2013-August
JO - Sustainable Construction Materials and Technologies
JF - Sustainable Construction Materials and Technologies
M1 - e362
T2 - 3rd International Conference on Sustainable Construction Materials and Technologies, SCMT 2013
Y2 - 18 August 2013 through 21 August 2013
ER -