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Reactivity and Microstructure of Calcined Marl as Supplementary Cementitious Material

  • Tone ØstnorEmail author
  • Harald Justnes
  • Tobias Danner
Conference paper
Part of the RILEM Bookseries book series (RILEM, volume 10)

Abstract

The reactivity and microstructure of cement paste and mortar where cement is replaced by up to 65 vol.% calcined marl are discussed. It was found that the compressive strength evolution of mortar is following the same linear relation with amount of hydrate water at early ages for different cement replacements (35-65 vol.%), but that this deviates and give higher strength than predicted by the bound water at higher ages. Strength increases on a long term in spite of depleted calcium hydroxide at earlier ages and are discussed in terms of changes in CSH and CAH. XRD does not reveal any unusual crystalline products, but ettringite and hemi-/mono-carboaluminate hydrate. SEM with WDS in a 2 year old mortar found pure CAH in a pore with atomic Ca/Al = 1.6 and some Si that might be a hydrogarnet.

Keywords

Compressive Strength Calcium Hydroxide Hydrate Water Pozzolanic Reaction Light Weight Aggregate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Notes

Acknowledgments

The paper is based on the work performed in COIN, see www.coinweb.no for information.

References

  1. 1.
    Justnes, H., Østnor, T., Danner, T.: Calcined marl as effective pozzolana. In: Proceedings of the International RILEM Conference on Advances in Construction Materials through Science and Engineering, RILEM PRO 79, Hong Kong, China, 8 p. 5–7 September 2011Google Scholar
  2. 2.
    Justnes, H., Østnor, T.A.: Durability and microstructure of mortar with calcined marl as supplementary cementing material. In: Proceedings of the XIII conference on Durability of Building Materials and Components (DBMC), Sao Paulo, Brazil, pp. 771–780, 3–5 September 2014Google Scholar
  3. 3.
    De Weerdt, K., Sellevold, E., Kjellsen, K.O., Justnes, H.: Fly ash—limestone ternary cements—effect of component fineness. Adv. Cem. Res. 23(4), 203–214 (2011)CrossRefGoogle Scholar

Copyright information

© RILEM 2015

Authors and Affiliations

  1. 1.SINTEF Building and InfrastructureTrondheimNorway
  2. 2.NTNU—Norwegian University of Science and TechnologyTrondheimNorway

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