المستودع الأكاديمي جامعة المدينة

Effect of Nanosilica Additions on Belite Cement Pastes Held in Sulfate Solutions

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dc.creator Dolado, J. S.
dc.creator Campillo, Igor
dc.creator Erkizia, Edurne
dc.creator Ibáñez, Jose A.
dc.creator Porro Gutiérrez, Antonio
dc.creator Guerrero Bustos, Ana María
dc.creator Goñi Elizalde, Sara
dc.date 2008-06-10T11:44:51Z
dc.date 2008-06-10T11:44:51Z
dc.date 2007
dc.date.accessioned 2017-01-31T01:38:25Z
dc.date.available 2017-01-31T01:38:25Z
dc.identifier J. Am. Ceram. Soc., 90(12): 3973–3976 (2007)
dc.identifier 0002-7820
dc.identifier http://hdl.handle.net/10261/4952
dc.identifier 10.1111/j.1551-2916.2007.02034.x
dc.identifier.uri http://dspace.mediu.edu.my:8181/xmlui/handle/10261/4952
dc.description 4 pages.-- Final full-text version of the paper available at: http://dx.doi.org/10.1111/j.1551-2916.2007.02034.x.
dc.description Fly Ash Belite Cement (FABC) pastes with and without nanosilica additions have been prepared and maintained in sulfate solutions (Na2SO4 0.5M) for 180 days. The mechanical performance and the changes in microstructure have been monitored at 28, 90, and 180 days by compressive strength, X-ray diffraction (XRD), and 29Si MAS NMR measurements. We have found that, unexpectedly, and contrary to what happens in Ordinary Portland Cements (OPC), the addition of nanosilica particles induces an initial decline in the compressive strength of the samples. Only in samples maintained for a long time (180 days) does the nanosilica addition improve the mechanical properties. Our XRD and 29Si NMR experiments have revealed that although nanosilica additions trigger the consumption of Belite phases, this is not always accompanied by formation of longer calcium–silicate–hydrate (C–S–H) gel structures. Only at a long time (180 days), and due to a mechanism that seems to be controlled by the pH of the samples, do the nanosilica additions lead to high-polymerized C–S–H gels.
dc.description This work was financially supported by the Spanish Government (Projects no. MAT 2002-04023-CO1-CO2-CO3 and MAT2005-03890).
dc.description Peer reviewed
dc.format 391041 bytes
dc.format application/pdf
dc.language eng
dc.publisher American Ceramic Society
dc.publisher John Wiley & Sons
dc.rights openAccess
dc.source http://dx.doi.org/10.1111/j.1551-2916.2007.02034.x
dc.title Effect of Nanosilica Additions on Belite Cement Pastes Held in Sulfate Solutions
dc.type Artículo


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