Rate of pozzolanic reaction of metakaolin in high-performance cement pastes

Chi Sun Poon, L. Lam, S. C. Kou, Y. L. Wong, Ron Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

261 Citations (Scopus)

Abstract

This paper assesses the hydration progress in metakaolin (MK)-blended high-performance cement pastes with age from the measurements of compressive strength, porosity, and pore size distribution, the degree of pozzolanic reaction, and the Ca(OH)2(CH) content of the MK-blended cement pastes at a water-to-binder ratio (w/b) of 0.3. Comparisons are also made with pastes containing silica fume (SF), fly ash (FA), and control Portland cement (PC). It is found that at early ages, the rates of pozzolanic reaction and CH consumption in the MK-blended cement pastes are higher than in the SF- or FA-blended cement pastes. The higher pozzolanic activity of MK results in a higher rate of strength development and pore structure refinement for the cement pastes at early ages. Although the rate of pozzolanic reaction of MK becomes slower after 28 days of curing, the pozzolanic reaction in the blended cement pastes with a w/b of 0.3 still continues at the age of 90 days. At this age, about half of the MK still are unreacted.
Original languageEnglish
Pages (from-to)1301-1306
Number of pages6
JournalCement and Concrete Research
Volume31
Issue number9
DOIs
Publication statusPublished - 1 Sep 2001

Keywords

  • Compressive strength
  • Degree of pozzolanic reaction
  • High performance
  • Metakaolin
  • Pore size distribution

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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