Comparing the performance of different commercial clays in fly ash-modified mortars

Nishant Garg, Kejin Wang

Research output: Contribution to journalArticlepeer-review


Three different commercially available clays (Actigel, Concresol, and Metamax) were compared based on their performance and effect on fly ash-modified mortars prepared with a consistent w/b of 0.45 and s/b of 2.75. Three fly ashes (FA1-3) from different sources were selected to evaluate the performance of these three clays. Ternary mortar blends were formed at various addition and replacement levels of these clays to study their performance in terms of the heat of hydration, thermal setting time, air content, flow ability, and compressive strength development up to 90 days. Results indicated that slight addition of Actigel or Palygorskite significantly affects the rheology as well as decreases the setting time of fresh mortar, the clay being able to alter the fresh state properties to a great extent. All the clays accelerated the cement hydration process as well as decreased the flow ability of mortars. Metamax or metakaolin was found to be the most reactive clay among the three clays in terms of its pozzolanic behavior.

Original languageEnglish (US)
Pages (from-to)111-125
Number of pages15
JournalJournal of Sustainable Cement-Based Materials
Issue number3
StatePublished - Sep 2012
Externally publishedYes


  • Fly ash
  • Metakaolin
  • Mineral clays
  • Palygorskite
  • Ternary blended mortars

ASJC Scopus subject areas

  • Ceramics and Composites
  • Waste Management and Disposal


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