Mortars with nano-SiO2 and micro-SiO2 investigated by experimental design

The effects of nanosilica (nS) and silica fume (SF) on the rheology, spread on flow table, compressive strength, water absorption, apparent porosity, unrestrained shrinkage and weight loss of mortars up to 28 days were assessed. Samples with nS (0-7 wt%), SF (0-20 wt%) and water/binder ratio (0.35-0...

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Published inConstruction & building materials Vol. 24; no. 8; pp. 1432 - 1437
Main Authors Senff, L, Hotza, D, Repette, W L, Ferreira, V M, Labrincha, J A
Format Journal Article
LanguageEnglish
Published 01.08.2010
Subjects
Compressive strength
Mortars
Nanocomposites
Nanomaterials
Nanostructure
Shrinkage
Spreads
Weight loss
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Summary:The effects of nanosilica (nS) and silica fume (SF) on the rheology, spread on flow table, compressive strength, water absorption, apparent porosity, unrestrained shrinkage and weight loss of mortars up to 28 days were assessed. Samples with nS (0-7 wt%), SF (0-20 wt%) and water/binder ratio (0.35-0.59), were investigated using factorial design experiments. 7 wt% nanosilica showed a faster structural formation during the rheological measurements. The structure formation influenced the yield stress more than the plastic viscosity and the yield stress related well with the spread on the table. Compressive strength, water absorption and apparent porosity did not fit the second order of the model for the range interval studied. In addition, the variation of the unrestrained shrinkage and weight loss of mortars did not follow a linear regression model. The maximum unrestrained shrinkage increased 80% for nS mortars (7 days) and 54% (28 days) when compared to SF mortars for the same periods.
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ISSN:0950-0618
DOI:10.1016/j.conbuildmat.2010.01.012