Effect of temperature on the microstructure of calcium silicate hydrate (C-S-H)

E. Gallucci*, X. Zhang, K. L. Scrivener

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

199 Scopus citations

Abstract

Temperature affects the properties of concrete through its effect on the hydration of cement and its associated microstructural development. This paper focuses on the modifications to C-S-H induced by isothermal curing between 5 and 60 C. The results show that as the temperature increases (within the range studied) the C/S ratio of C-S-H changes only slightly, with a higher degree of polymerisation of silicate chains, but there is a significant decrease in its bound water content and an increase of apparent density of 25%. This increase seems to come from a different packing of C-S-H at the nanoscale. As a consequence of these changes, the microstructure of the cement paste is much coarser and porous, which explains the lower final strengths obtained by curing at elevated temperatures.

Original languageEnglish (US)
Pages (from-to)185-195
Number of pages11
JournalCement and Concrete Research
Volume53
DOIs
StatePublished - Jul 24 2013

Keywords

  • BSE
  • Calcium silicate hydrate (C-S-H) (B)
  • Microstructure (B)
  • SEM (B)
  • Temperature (A)

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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