期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 138, 期 -, 页码 285-295出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2017.01.129
关键词
Silica nanoparticles; High strength concrete; Fly ash
资金
- AcSIR-New Delhi
- UGC-New Delhi
- CSIR-CBRI, Roorkee
This study deals with the effect of silica nanoparticles (SNPs) in high volume fly ash (40% replacement) cement paste, mortar and concrete. The content of SNPs (0.5-3.0%) was added by the weight of binder and w/b ratio (0.23, 0.25 & 3.0) was optimized in paste and mortar system. The calorimetric results reveal that the hydration process was accelerated as a result of SNPs incorporation and the dormant period was shortening by 4 h with 2% SNPs as compared to the control. The effect of optimum dosages of SNPs addition on concrete in terms of mechanical and durability properties was studied at 0.25 w/b ratio. The compressive strength results of SNPs added mixtures showed an improvethent of 61% at 3 days and 25% at 28 days of hydration as compared to control. The durability studies at 28 day showed that, with the incorporation of SNPs, the porosity, sorptivity and water absorption reduced up to 25-40% and densify the interfacial transition zone (ITZ). (C) 2017 Elsevier Ltd. All rights reserved.
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