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Investigation of C-A-S-H composition, morphology and density in Limestone Calcined Clay Cement (LC3)

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Abstract

In this study, the C-A-S-H composition, morphology and density are characterized for Limestone Calcined Clay Cement (LC3-50) blends containing clays with various kaolinite contents. Significant incorporation of aluminium is observed for LC3-50 blends compared with reference Portland cement (PC), and this incorporation increases with the kaolinite content of the calcined clay. No change of C-A-S-H morphology was observed by Transmission Electron Microscopy (TEM) between reference PC and LC3-50 blends, with a “fibrillar” morphology for all samples. The determination of the density of C-A-S-H measured by 1H NMR also shows very similar results with a bulk density close to 2.0 g·cm−3 and a solid density of around 2.8 g·cm−3 for all systems.

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Avet, F., Boehm-Courjault, E., & Scrivener, K. (2019). Investigation of C-A-S-H composition, morphology and density in Limestone Calcined Clay Cement (LC3). Cement and Concrete Research, 115, 70–79. https://doi.org/10.1016/j.cemconres.2018.10.011

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