English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/173795
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Investigation of C-S-H in ternary cement pastes containing nanosilica and highly-reactive supplementary cementitious materials (SCMs): Microstructure and strength

AuthorsSilva Andrade, Daniel da; Henrique da Silva Rêgo, Joao; Morais, Paulo César; Neiry de Mendonça Lopes, Anne; Frías, Moisés
KeywordsNanosilica
Silica fume
Issue Date2019
PublisherElsevier
CitationConstruction and Building Materials Volume 198, (20) , 445-455, (2019)
AbstractThis pioneering study reports on the investigation of C-S-H in as-produced ternary cement pastes while highly reactive supplementary cementitious materials, such as silica fume (SF) and metakaolin (MK), and colloidal nanosilica (NS) are included into the mixtures. Several techniques are used to evaluate the microstructure of the pastes containing colloidal NS (3%), SF (10%) and MK (10%): Consistency, compressive strength, thermogravimetric analyses, Fourier transform infrared spectroscopy, scanning electron microscopy (with energy dispersive X-ray spectrometry), 29Si-nuclear magnetic resonance, and mercury intrusion porosimetry. Ternary mixtures containing SF or MK require the highest superplasticizer (SP) consumption of 1.55% and 1.92%, respectively. Impressively, in late stage of aging, i.e 28 and 91 days of hydration, ternary mixtures reach compressive strength respectively above 90 MPa and 100 MPa, meaning an increase of about 30% above of the compressive strength of the reference paste. Moreover, the ternary MK-based paste shows increase C-S-H production, decreasing Ca/Si ratio and superior increasing mean chain length (MCL) of about 11.1 while compared with the MCL of the reference paste (about 4.6). Likewise, the highest relative reduction in mean porous size (56%) and the lowest total porosity (15.06%) is found in the ternary MK-based paste. Indeed, a strong synergistic effect was observed in the ternary mixture containing MK and NS.
Publisher version (URL)https://doi.org/10.1016/j.conbuildmat.2018.10.235
URIhttp://hdl.handle.net/10261/173795
DOI10.1016/j.conbuildmat.2018.10.235
Appears in Collections:(IETCC) Artículos
Files in This Item:
File Description SizeFormat 
ACCESORESTRINGIDO.pdf15,38 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.