Rheology of Portland cement pastes with calcined clays additions

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In this paper, the rheological behavior of pastes of Portland cement and different calcined clays additions were analyzed. For this purpose, two Portland cements with different mineralogical composition (low C3A and high C3S content and low C3S and high C3A content) combined with different replacement percentages of three minerals additions of aluminic nature (quartz as control, and two metakaolins) are used. Mineral admixtures have different crystallinity and morphology: the quartz is fully crystalline; metakaolins are vitreous with a small fraction crystalline. The vitreous phase gives to the calcined clays, pozzolanic properties. All determinations were performed on Haake Roto Visco at 25° C, just on the latency period of hydration. The results show that Portland cement with low C3A content and high C3S content present great shear resistance and the replacement by calcined clays addition affect the rheological behavior of paste depending on the pozzolanic nature and the reactivity.

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Journal: TechConnect Briefs
Volume: Technical Proceedings of the 2014 Clean Technology Conference and Trade Show
Published: June 15, 2014
Pages: 320 - 323
Industry sectors: Advanced Materials & Manufacturing | Energy & Sustainability
Topic: Sustainable Materials
ISBN: 978-1-4822-5819-6