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Report of RILEM TC 267—TRM: Improvement and robustness study of lime mortar strength test for assessing reactivity of SCMs

  • RILEM TC 267—TRM: Development and validation of tests for measuring the reactivity of supplementary cementitious materials
  • Published:
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Abstract

RILEM TC 267-TRM is studying tests for the reactivity supplementary cementitious materials (SCMs). In the first phase, the lime reactivity (LR) test, which is standardised in Indian standard (IS)-1727, gave promising correlations with 90-days cement mortar strength. In Phase 2, working group 1 has looked at further optimisation and robustness study of the LR test. A parameter screening approach for improving the mix design to use fixed mass proportions targeting enhanced reproducibility and robustness was focused. The parameters studied include mixture properties such as the effects of lime (hydrated lime/calcium hydroxide-CH) to SCM ratio, water to binder (binder = CH + SCM) ratio (w/b), activators, curing temperature, and testing age as well as the impact of factors from different national standards (IS and European Committee for Standardisation-EN) such as mould size, shape & type of sand. The modified mixture recommended by the TC uses a fixed CH to SCM mass ratio of 1:1 and the addition of activators. Also, a higher curing temperature of 50 °C in comparison to the 27 °C specified in IS 1727, for the first 2 days is proposed to accelerate the early hydration especially for slowly reacting SCMs. It is also recommended that, the minimum purity and fineness of the CH need to be specified to obtain reproducible results.

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Acknowledgements

A. Parashar and S. Bishnoi acknowledge financial support by the Swiss Agency for Development and Cooperation (SDC) Grant 81026665. Aneeta Mary Joseph acknowledges the financial support from the foundations Strategic Initiative Materials (SIM) in Flanders and Flanders Innovation & Entrepreneurship (VLAIO) of Project ASHCEM within the program MARES. S. Dolenec acknowledges the financial support from the Slovenian Research Agency (research core funding No. P2−0273).

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Correspondence to Anuj Parashar.

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All co-authors are members in RILEM TC 267-TRM. None of the co-authors has financial conflict of interest.

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This report has been prepared by RILEM TC 267-TRM: Tests for Reactivity of Supplementary Cementitious Materials. The paper has been reviewed and approved by all members of the TC.

TC Membership: Chair: Karen Scrivener, Switzerland; Deputy Chair: Ruben Snellings, Belgium; Members: Edgardo Irassar, Yury Andrés Villagran Zaccardi, Argentina; Natalia Alderete, Özlem Cizer, Nele De Belie, Asghar Gholizadeh-Vayghan, Aneeta Mary Joseph, Belgium; Josée Duchesne, R. Doug Hooton, Mahipal Kasaniya, Michael Thomas, Canada; Sui Tongbo, China; François Avet, Martin Cyr, Siham Kamali-Bernard, Cédric Patapy, Serge Sabio, Laurent Steger, France; Mohsen Ben Haha, Pawel Durdzinski, Johannes Haufe, Xuerun Li, Matthias Maier, Karl-Christian Thienel, Anya Vollpracht, Simone Schulze, Johannes Pfingsten, Germany; Shashank Bishnoi, Manu Santhanam, Anuj Parashar, Yuvaraj Dhandapani, India; Milena Marroccoli, Antonio Telesca, Italy; Guang Ye, Shizhe Zhang, Netherlands; Klaartje De Weerdt, Malene Thostrup Pedersen, Norway; Sabina Dolenec, Marusa Mrak, Slovenia; Diana Londono Zuluaga, Frank Winnefeld, Marta Palacios, Mathieu Antoni, Switzerland; Susan Bernal Lopez, Alastair Marsh, John Provis, Brant Walkley, UK; Maria C.G. Juenger, USA.

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Parashar, A., Vollpracht, A., Haufe, J. et al. Report of RILEM TC 267—TRM: Improvement and robustness study of lime mortar strength test for assessing reactivity of SCMs. Mater Struct 55, 96 (2022). https://doi.org/10.1617/s11527-022-01911-1

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