IngentaConnect Influence of added nanosilica and/or silica fume on fresh and har...

Authors: Senff, L.¹; Hotza, D.²; Repette, W.L.³; Ferreira, V.M.⁴; Labrincha, J.A.⁵

Source: Advances in Applied Ceramics, Volume 108, Number 7, October 2009 , pp. 418-428(11)

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.

Keywords: NANOSILICA; SILICA FUME; FRESH PROPERTIES; RHEOLOGY; FLOW TABLE

Document Type: Research article

DOI: 10.1179/174367609X422108

Affiliations: 1: Materials Science and Engineering Graduate Program (PGMAT), Federal University of Santa Catarina (UFSC), 88040-900 Florianópolis, SC, Brazil;, Email: lsenff@gmail.com 2: Materials Science and Engineering Graduate Program (PGMAT), Federal University of Santa Catarina (UFSC), 88040-900 Florianópolis, SC, Brazil, Department of Chemical Engineering (EQA), Federal University of Santa Catarina (UFSC), 88040-900 Florianópolis, SC, Brazil 3: Department of Civil Engineering (ECV), Federal University of Santa Catarina (UFSC), 88040-900 Florianópolis, SC, Brazil 4: Department of Civil Engineering (CICECO), University of Aveiro (UA), 3810-193 Aveiro, Portugal 5: Department of Ceramics and Glass Engineering (CICECO), University of Aveiro (UA), 3810-193 Aveiro, Portugal

The full text electronic article is available for purchase. You will be able to download the full text electronic article after payment.

$51.00 plus tax Refund Policy

Influence of added nanosilica and/or silica fume on fresh and hardened properties of mortars and cement pastes