Abstract
Tricalcium aluminate () is the most reactive phase in portland cement clinker. In the study of the hydration process, the use of synthetic samples is often preferred over clinker-sourced samples due to the absence of traces of other elements in synthetic . However, the reproduction of results from synthetic samples using clinker-sourced samples is challenging due to the difficulty of complete extraction of aluminate phases from clinkers without damaging their structure. Salicylic and maleic acid/methanol solutions were used in the past to isolate , but complete extraction has not been observed. Thus, it was necessary to modify the selective dissolution (SD) method. Possible processes were tested with white and ordinary portland clinkers. A modified process with maleic acid/methanol solution was developed and the samples were analyzed by X-ray diffraction (XRD), thermogravimetric analysis (TGA), and Raman spectroscopy, compared with synthetic samples. The modified selective dissolution process with maleic acid/methanol solution proposed in this work was effective in achieving complete isolation of aluminate-based phases, and can be used for further studies of the hydration process of clinker-sourced samples to improve the understanding and quality of portland cement clinkers.
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Acknowledgments
The participation of J.L. Provis was sponsored by the CNPq (Brazilian National Council for Scientific and Technological Development) PVE Grant No. 407319/2013-1, L.S. Girotto by SWE Grant No. 234321/2014-8 and GM/GD Grant No. 141848/2015-4, E.D.Rodríguez by CNPq PQ Grant No. 303753/2017-0. A.P. Kirchheim acknowledged the financial support by CNPQ PQ Grant No. 305530/2017-8. The authors also acknowledge the Laboratory of Ceramics (LACER) and Building Innovation Research Unit (NORIE) at Federal University of Rio Grande do Sul (UFRGS) and the Department of Materials Science and Engineering at the University of Sheffield. Prof. Paulo Monteiro (University of California, Berkeley) is also acknowledged for his kind support providing the synthetic used in this study.
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Journal of Materials in Civil Engineering
Volume 32 • Issue 1 • January 2020
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©2019 American Society of Civil Engineers.
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Received: Oct 17, 2018
Accepted: Jun 14, 2019
Published online: Oct 25, 2019
Published in print: Jan 1, 2020
Discussion open until: Mar 25, 2020
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