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Combined effect of amorphous nanosilica and temperature on white Portland cement hydration

AuthorsSáez del Bosque, I.F.; Martínez-Ramírez, S. ; Blanco-Varela, María Teresa
Issue Date2013
PublisherAmerican Chemical Society
CitationIndustrial and Engineering Chemistry Research 52: 11866- 11874 (2013)
AbstractWhite cement pastes were hydrated in the presence or absence of amorphous nanosilica (nSA) and cured at 25 or 65°C. The findings showed that at the higher curing temperature the initial belite hydration rate rose substantially and that this effect was more accentuated in the pastes containing nSA. The C-S-H gel formed in the presence of nSA was more uniform and had a consistently longer mean chain length (MCL) than in the gels formed in the absence of the addition. Moreover, the C-S-H gel formed in nSA-bearing paste cured at the higher temperature had a longer MCL and a higher Al3+ uptake than the gels in the other pastes studied. Lastly, at 65°C, the presence of nSA stabilized ettringite formation during the first 28 days of paste hydration; while no calcium hemicarboaluminate, which was the sole crystalline aluminate hydrate identified in the unblended pastes, was detected in the nSA-containing pastes. © 2013 American Chemical Society.
Identifiersdoi: 10.1021/ie401318j
issn: 0888-5885
Appears in Collections:(IETCC) Artículos
(CFMAC-IEM) Artículos
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