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Microstructure of tricalcium silicate and Portland cement system at middle periods of hydration-development of Hadley grains
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
2007 (English)In: Cement and Concrete Research, ISSN 0008-8846, E-ISSN 1873-3948, Vol. 37, no 1, 13-21 p.Article in journal (Refereed) Published
Abstract [en]

The development of the microstructure of C3S paste and a Portland cement paste was studied between 7 and 24 h by means of backscattered electrons in a field-emission SEM. The course of hydration was measured by isothermal calorimetry. While the abundant occurrence of Hadley grains (hollow-shells) in Portland cement systems is well documented from a number of SEM and other microscopy studies, some earlier reports have noted that Hadley grains do not form in C3S or alite paste alone. This report shows evidence of Hadley grains in C3S paste, and follows their development from middle to late hydration stages. At around 10 h the microstructure with respect to Hadley grains were seen to develop in a very similar manner in C3S and cement. In both systems, a narrow gap often developed between the receding anhydrous cores and layer of reaction product enveloping the cores. By 1 day, Hadley grains had continued to develop only in the cement paste, where they became a prominent feature. Only small 'hollowed-out' hydration shells were observed in the C3S paste by 1 day. These were presumably reminiscences of the small gapped Hadley grains seen at the earlier hydration stages.

Place, publisher, year, edition, pages
2007. Vol. 37, no 1, 13-21 p.
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-80106DOI: 10.1016/j.cemconres.2006.09.008ISI: 000243270700002OAI: diva2:495993
QC 20120229Available from: 2012-02-09 Created: 2012-02-09 Last updated: 2012-02-29Bibliographically approved

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