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<p>Due to their high specific surface, the incorporation of calcined clays (CC) as supplementary cementitious materials (SCMs) reduces the workability of standard mortars, as Water/Binder ratio (W/B) and compaction energy are kept constant, while assessing their activity according to NF EN 196-1. Thus, mortars incorporating calcined clays display a different initial porosity than reference mortars made with Ordinary Portland Cement (OPC). In this study, the impact of the variation of the initial porosity on compressive strength at 28&#xa0;days and consequently on measured CC activity is first assessed. Two types of binder are here studied: 85wt% OPC + 15wt% CC and LC3-50 (limestone calcined clay cement with 50wt% clinker) with three different kaolinitic clays, calcined at different temperatures. A method is proposed to accurately measure the air fraction in the mortars to be able to compare compressive strength of these at similar porosity, allowing to get rid of experimental variation in porosity for binder activity assessment. It seems that evaluating the activity of a binder with Strength Activity Index (SAI), regardless initial porosity can lead to an underestimation of the activity of binders containing calcined clays.</p>

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Methodology to assess the activity of binders containing calcined clays getting rid of porosity variation

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • N. Lely,
  • L. Lemesre,
  • S. Guihéneuf,
  • M. Clément,
  • D. Rangeard,
  • A. Perrot

摘要

Due to their high specific surface, the incorporation of calcined clays (CC) as supplementary cementitious materials (SCMs) reduces the workability of standard mortars, as Water/Binder ratio (W/B) and compaction energy are kept constant, while assessing their activity according to NF EN 196-1. Thus, mortars incorporating calcined clays display a different initial porosity than reference mortars made with Ordinary Portland Cement (OPC). In this study, the impact of the variation of the initial porosity on compressive strength at 28 days and consequently on measured CC activity is first assessed. Two types of binder are here studied: 85wt% OPC + 15wt% CC and LC3-50 (limestone calcined clay cement with 50wt% clinker) with three different kaolinitic clays, calcined at different temperatures. A method is proposed to accurately measure the air fraction in the mortars to be able to compare compressive strength of these at similar porosity, allowing to get rid of experimental variation in porosity for binder activity assessment. It seems that evaluating the activity of a binder with Strength Activity Index (SAI), regardless initial porosity can lead to an underestimation of the activity of binders containing calcined clays.