Analysis of cracking in high-strength cementitious materials under heating and re-curing using X-ray CT

Michael Henry, Ivan Sandi Darma, Yuto Haraguchi, Takafumi Sugiyama

Research output: Contribution to journalConference article

4 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article numbere362
JournalSustainable Construction Materials and Technologies
Volume2013-August
Publication statusPublished - 2013
Externally publishedYes
Event3rd International Conference on Sustainable Construction Materials and Technologies, SCMT 2013 - Kyoto, Japan
Duration: 2013 Aug 182013 Aug 21

Keywords

  • Cracking
  • Fire damage
  • High-strength concrete
  • Water re-curing
  • X-ray CT

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials
  • Materials Science(all)

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