Influence of Calcining Temperature on the Mineralogical and Mechanical Performance of Calcined Impure Kaolinitic Clays in Portland Cement Mortars

Kwabena Boakye, Morteza Khorami, Messaoud Saidani, Esmaiel Ganjian, Andrew Dunster, Mark Tyrer, Ahmad Ehsani

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Abstract

In this work, the effects of calcination temperatures ranging from 600°C to 1,000°C on the changes in mineralogical phases and mechanical characteristics of calcined impure kaolinite clay blended cement mortars were investigated. The impact of calcining temperature on pozzolanic activity of impure kaolinite clay was evaluated using direct and indirect methods. The findings demonstrated that at 700°C, kaolinite changed from a crystalline to an amorphous metakaolin phase. Specific surface, water demand, and setting time of the blended cements decreased as calcining temperature increased. The compressive strengths of blended cement mortar containing low-grade clay calcined at 700°C, 800°C, and 900°C were found to be greater than that of 600°C and 1,000°C. Based on the results of pozzolanic reactivity evaluations and compressive strength development, the most effective calcining temperature was shown to be between 800°C and 900°C.
Original languageEnglish
Article number04024040
Number of pages10
JournalJournal of Materials in Civil Engineering
Volume36
Issue number4
Early online date27 Jan 2024
DOIs
Publication statusE-pub ahead of print - 27 Jan 2024

Bibliographical note

This material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers. This material may be found at https://ascelibrary.org/doi/10.1061/JMCEE7.MTENG-16128

This document is the author’s post-print version, incorporating any revisions agreed during the peer-review process. Some differences between the published version and this version may remain and you are advised to consult the published version if you wish to cite from it.

Keywords

  • Calcined clay
  • Low-grade kaolinitic clays
  • Mineralogical properties
  • Calcining temperature
  • Pozzolanic reactivity

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