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The environmental impact of Ordinary Portland Cement (OPC) production has intensified interest in supplementary cementitious materials that can reduce clinker consumption. This study presents a systematic screening of selected Sri Lankan kaolin deposits to evaluate their suitability as precursors for metakaolin-based supplementary cementitious materials. Natural kaolin sourced from Meetiyagoda, Middeniya, Bangadeniya, and Wadduwa, together with ceramic industrial waste clays, were characterized before and after calcination using thermogravimetric analysis (TGA), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and energy-dispersive X-Ray spectroscopy (EDX). The pozzolanic reactivity of calcined natural kaolin was assessed using the modified Chapelle test as a chemical screening indicator. Results revealed significant variability among the investigated sources, with Meetiyagoda kaolin exhibiting the highest lime fixation capacity. Industrial waste clays were found to contain substantial manufacturing additives, limiting their direct applicability without further processing. The findings provide a technical basis for ranking and shortlisting locally available kaolin resources for future blended cement performance evaluation.

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Investigation of the Pozzolanic Characteristics of Sri Lankan Kaolin for Use in Blended Cement

  • 会议论文

  • 发表日期：

    2026年

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  • J. Y. Anjana,
  • R. N. H. Sulakshana,
  • S. A. S. N. Siyambalapitiya,
  • S. U. Adikary

摘要

The environmental impact of Ordinary Portland Cement (OPC) production has intensified interest in supplementary cementitious materials that can reduce clinker consumption. This study presents a systematic screening of selected Sri Lankan kaolin deposits to evaluate their suitability as precursors for metakaolin-based supplementary cementitious materials. Natural kaolin sourced from Meetiyagoda, Middeniya, Bangadeniya, and Wadduwa, together with ceramic industrial waste clays, were characterized before and after calcination using thermogravimetric analysis (TGA), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and energy-dispersive X-Ray spectroscopy (EDX). The pozzolanic reactivity of calcined natural kaolin was assessed using the modified Chapelle test as a chemical screening indicator. Results revealed significant variability among the investigated sources, with Meetiyagoda kaolin exhibiting the highest lime fixation capacity. Industrial waste clays were found to contain substantial manufacturing additives, limiting their direct applicability without further processing. The findings provide a technical basis for ranking and shortlisting locally available kaolin resources for future blended cement performance evaluation.