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This study explores the feasibility of utilizing local Czech clay from the Kadaň area, with a yield of ~ 35% kaolin from the clay matrix, to produce limestone calcined clay cement (LC3). The raw clay was first ground using a laboratory-scale disk mill to achieve different fineness and then calcined at 800 °C. Pozzolanic activity of calcined clay was assessed using an accelerated R3 pozzolanic test. The effect of the fineness of raw clay on the microstructure development and the compressive strength of LC3 with 20, 35, and 50% cement replacement was studied at 28 days of hydration.

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Effect of Fineness and Addition Levels of Low-Grade Czech Clay on the Microstructure and Compressive Strength of Calcined Clay-Limestone Cement

  • 会议论文

  • 发表日期：

    2025年

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  • Lenka Scheinherrová,
  • Vojtěch Pommer,
  • Meenakshi Sharma

摘要

This study explores the feasibility of utilizing local Czech clay from the Kadaň area, with a yield of ~ 35% kaolin from the clay matrix, to produce limestone calcined clay cement (LC3). The raw clay was first ground using a laboratory-scale disk mill to achieve different fineness and then calcined at 800 °C. Pozzolanic activity of calcined clay was assessed using an accelerated R3 pozzolanic test. The effect of the fineness of raw clay on the microstructure development and the compressive strength of LC3 with 20, 35, and 50% cement replacement was studied at 28 days of hydration.