Influence of added nanosilica and/or silica fume on fresh and hardened properties of mortars and cement pastes
authors Senff, L; Hotza, D; Repette, WL; Ferreira, VM; Labrincha, JA
nationality International
journal ADVANCES IN APPLIED CERAMICS
author keywords Nanosilica; Silica fume; Fresh properties; Rheology; Flow table
keywords NANO-PARTICLES; NANO-SIO2; CONCRETE
abstract The rheological characterisation of mortars having low water content is difficult to perform due to internal friction between surface grains and also due to intense agglomeration of particles. In this paper, mortars and cement paste with additions of nanosilica (nS), silica fume ( SF) and nS+SF were studied applying a factorial design methodology. Mortars with water/total solids ratios below 16% were characterised in the fresh state by rheological and flow table tests. Thus, all mixtures show suitable workability in both equipments. Compressive strength, setting time, air content, fresh apparent density, hydration temperature and X-ray diffraction were carried out. The optimum amount of nS and SF for each W/B ratio between 0.35 and 0.47 was determined by compressive strength at 28 days. For W/B<0.43, SF shows the best results, while for W/B>0.43, nS reaches better performance. In general, nS addition affects the properties more significantly than SF.
publisher MANEY PUBLISHING
issn 1743-6753
year published 2009
volume 108
issue 7
beginning page 418
ending page 428
digital object identifier (doi) 10.1179/174367609X422108
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000271432200006
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journal analysis (jcr 2019):
journal impact factor 1.669
5 year journal impact factor 1.503
category normalized journal impact factor percentile 58.929
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