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<p>This experimental research study employs our novel ultrasound non-destructive technique to analyze the influence of an alkali accelerator on the hydration kinetics of Portland cement-based mortar. The innovative method, previously detailed in our earlier work, enables precise tracking of critical hydration stages by monitoring ultrasound parameter describing the attenuation in a mortar medium versus age of hydration. By varying the dosages of the alkali accelerator, we were able to observe significant changes in the hydration process, including the early transformation of Ettringite (AFt) into Monosulfate (AFm) and the shortened setting period. These findings highlight the sensitivity of our ultrasound method to detect the effects of alkali accelerators in real-time. However, the faster hydration reactions induced by higher dosages of the accelerator also led to increased porosity, which negatively affected viscoelastic characteristics of the mortar, like elasticity modulus and density. This study demonstrates the utility of our ultrasound technique as a powerful tool for optimizing cementitious material formulations.</p>

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Application of a novel ultrasound technique for real-time characterization of alkali accelerating admixture effects on cement mortar hydration

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Nabil Khatib,
  • El Houssaine Ouacha,
  • Hicham Banouni,
  • Bouazza Faiz

摘要

This experimental research study employs our novel ultrasound non-destructive technique to analyze the influence of an alkali accelerator on the hydration kinetics of Portland cement-based mortar. The innovative method, previously detailed in our earlier work, enables precise tracking of critical hydration stages by monitoring ultrasound parameter describing the attenuation in a mortar medium versus age of hydration. By varying the dosages of the alkali accelerator, we were able to observe significant changes in the hydration process, including the early transformation of Ettringite (AFt) into Monosulfate (AFm) and the shortened setting period. These findings highlight the sensitivity of our ultrasound method to detect the effects of alkali accelerators in real-time. However, the faster hydration reactions induced by higher dosages of the accelerator also led to increased porosity, which negatively affected viscoelastic characteristics of the mortar, like elasticity modulus and density. This study demonstrates the utility of our ultrasound technique as a powerful tool for optimizing cementitious material formulations.