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Properties improvement of fly ash cenosphere modified cement pastes using nano silica
Hanif, Asad; Parthasarathy, Pavithra; Ma, Hongyan; Fan, Tianyuan; Li, Zongjin
2017-08
Source PublicationCEMENT & CONCRETE COMPOSITES
ISSN0958-9465
Volume81Pages:35-48
AbstractIn this study, the effect of nano silica (NS) on the properties of cement pastes incorporated with of fly ash cenospheres (FACs) has been investigated. A fixed amount of 1 % NS was added to cement pastes containing various proportions of FAC. It was found that NS was beneficial in improving the mechanical strength of the FAC modified cement pastes. At the 7 day age, the strength increase for NS modified pastes was about 17 % as compared to pastes without NS. However, the strength enhancement effect decreased with increasing age and FAC content. The dense microstructure of the NS modified pastes compensated for the higher porosity associated with FAC incorporation, leading to the reduced total porosity. With NS, there was better bonding of the FAC particles in the matrix, due to the enhanced interface. The reduced Ca(OH)(2) content and partially consumed FAC spherical shells at the early age showed that NS increased the pozzolanic activity of FAC in the cement pastes. (C) 2017 Elsevier Ltd. All rights reserved.
KeywordCement paste Fly ash cenosphere Nano silica Microstructure Thermal analysis Porosity BET analysis
DOI10.1016/j.cemconcomp.2017.04.008
URLView the original
Indexed BySCI
Language英语
WOS Research AreaConstruction & Building Technology ; Materials Science
WOS SubjectConstruction & Building Technology ; Materials Science, Composites
WOS IDWOS:000404310400004
PublisherELSEVIER SCI LTD
The Source to ArticleWOS
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Cited Times [WOS]:47   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Recommended Citation
GB/T 7714
Hanif, Asad,Parthasarathy, Pavithra,Ma, Hongyan,et al. Properties improvement of fly ash cenosphere modified cement pastes using nano silica[J]. CEMENT & CONCRETE COMPOSITES,2017,81:35-48.
APA Hanif, Asad,Parthasarathy, Pavithra,Ma, Hongyan,Fan, Tianyuan,&Li, Zongjin.(2017).Properties improvement of fly ash cenosphere modified cement pastes using nano silica.CEMENT & CONCRETE COMPOSITES,81,35-48.
MLA Hanif, Asad,et al."Properties improvement of fly ash cenosphere modified cement pastes using nano silica".CEMENT & CONCRETE COMPOSITES 81(2017):35-48.
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