Observation of phase transformations in cement during hydration

Choudhary, Harish Kumar and Anupama, A and Kumar, R and Panzi, ME and Matteppanavar, S and Sherikar, Baburao N and Sahoo, B (2015) Observation of phase transformations in cement during hydration. In: CONSTRUCTION AND BUILDING MATERIALS, 101 (1). pp. 122-129.

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Abstract

We report the phase transformations in Portland cement before and after hydration. The hydration mechanism was studied in detail by using a full Rietveld refinement of the X-ray diffraction (XRD) patterns, Fourier Transformed Infra-Red (FTIR) spectroscopy, Thermogravimetric Analysis (TGA) and Mossbauer spectroscopy at room temperature. From the Rietveld refinement of XRD data, alite, belite, celite, brown-millerite and low quartz phases were detected and quantified as major phases in dry cement powder. After hydration, calcium carbonate, portlandite and ettringite phases were found to form. A large reduction in the amounts of alite and belite phases were observed suggesting the formation of amorphous C-S-H phase and emphasizing the role of alite phase in flash setting of cement, as justified by the XRD and FTIR spectroscopy. Mossbauer spectra of all the unset samples showed quadrupole split doublets corresponding to the brownmillerite phase which remains unchanged even after about one week of hydration, suggesting that brownmillerite did not transform to other phases during initial stage of hydration process. (C) 2015 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	CONSTRUCTION AND BUILDING MATERIALS
Publisher:	ELSEVIER SCI LTD
Additional Information:	Copy right for this article belongs to the ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Keywords:	Phase transformation in cement; Rietveld refinement; FTIR spectroscopy; TGA; Mossbauer spectroscopy
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	07 Jan 2016 05:00
Last Modified:	01 Mar 2019 09:27
URI:	http://eprints.iisc.ac.in/id/eprint/53034

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