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Effect of grinding on the quantification of the bound water in tricalcium silicate

Journal Contribution - Journal Article

The effect of grinding of hydrated tricalcium silicate (C3S) pastes on the bound water content measured by TGA is investigated. The samples were subjected to different curing regimes at 20°C and 40°C at a constant water to cement ratio of 0.5. Hydration reactions were stopped using a freeze drier. To study the effect of grinding, samples were either roughly crushed or finely ground. Although the amount of water measured from the dehydroxylation of portlandite is not affected with grinding, the amount of total bound water increases with grinding. This increase in measured bound water is not affected by the studied curing regimes and degrees of hydration of C3S. Fine grinding before hydration stoppage using freeze dryer measured similar bound water content compared to crushed samples. It is proposed that the increase in measured bound water content after grinding of the sample is due to the confinement of physically bound water in the interlayers of C-S-H.
Journal: Advances in Cement Research
ISSN: 0951-7197
Issue: 10
Volume: 32
Pages: 476 - 480
Publication year:2019
BOF-keylabel:yes
IOF-keylabel:yes
BOF-publication weight:1
CSS-citation score:1
Authors from:Higher Education
Accessibility:Closed