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The optimum processing of cementitious materials requires a fundamental understanding of their rheological properties and their microscopic origin. In this work, we report a substantial improvement of our previously developed Rheo-FTIR device which consists of a combination of a strain-controlled high-end ARES G2 rheometer with a highly sensitive Matrix-M IR-spectrometer. The core of this set-up is the unique design of the IR upper plate, which acts as an attenuated total reflectance (ATR) sampling tool. The newly developed combined technique allows correlating macroscopic rheological properties with microscopic and molecular chemical changes. To demonstrate its potential, the Rheo-FTIR was applied to monitor the formation of ettringite during the structural build-up of ordinary Portland cement (OPC) paste. To mimic the influence of highly charged polycarboxylate ether (PCE) on the formation of ettringite, two poly(methacrylic acid) (PMAA) model systems of a linear and a star topology were synthesized. Their influence on the formation of ettringite was investigated via Rheo-FTIR.

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The Development of a Unique Rheo-FTIR Set-up to Monitor Ettringite Formation in the Presence of Highly Charged Polymers

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  • 发表日期：

    2026年

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  • Tamara Meyer,
  • Christopher O. Klein,
  • Roxana Figuli,
  • Manfred Wilhem

摘要

The optimum processing of cementitious materials requires a fundamental understanding of their rheological properties and their microscopic origin. In this work, we report a substantial improvement of our previously developed Rheo-FTIR device which consists of a combination of a strain-controlled high-end ARES G2 rheometer with a highly sensitive Matrix-M IR-spectrometer. The core of this set-up is the unique design of the IR upper plate, which acts as an attenuated total reflectance (ATR) sampling tool. The newly developed combined technique allows correlating macroscopic rheological properties with microscopic and molecular chemical changes. To demonstrate its potential, the Rheo-FTIR was applied to monitor the formation of ettringite during the structural build-up of ordinary Portland cement (OPC) paste. To mimic the influence of highly charged polycarboxylate ether (PCE) on the formation of ettringite, two poly(methacrylic acid) (PMAA) model systems of a linear and a star topology were synthesized. Their influence on the formation of ettringite was investigated via Rheo-FTIR.