Abstract
abstract: For a controlled granulometry, this study evaluates the effect of nano-silica on mechanical and rheological properties, as well in the microstructure of Portland cement matrices containing a fixed amount of supplementary cementitious materials and three different types of cements. The rheological behavior of cement pastes was evaluated by rotational rheometry and mechanical performance was measured througth the compressive strength. The microstructure was analyzed by intrusion mercury porosimetry and scanning electron microscopy. There was an increasing on the viscosity of the cementitious matrices, as a consequence of the reduction in the inter particle separation of these suspensions. The optimum content of nano-silica varied according to Ca/Si ratio of Portland cement matrices containing supplementary cementitious materials. The use of nano-silica allowed to modify the pore size distribution of cementitious matrices. And the structure of nano-silica in cementitious matrices has occurred in layers or agglomerates of nano-particles covered by hydration products.
Highlights
The use of supplementary cementitious materials (SCM) is a currently trend, which can contribute to reducing the environmental impact of the Portland cement industry [1]
For mixtures containing supplementary cementitious material (SCM), there are no references about the combined effect of nano-silica and cement type on the rheological and mechanical properties, as well on the microstructure of Portland cement matrices
For a controlled granulometry, the present study aims to evaluate the effect of nano-silica on mechanical and rheological properties, as well on the microstructure of Portland cement matrices containing a fixed amount of supplementary cementitious materials and three different types of cement
Summary
Mendes et al [7] showed that better efficiency was achieved for mixtures containing low amount of nano-silica. Zanon et al [11] showed better mechanical performance for mixtures formulated with 0.5 wt.% of nano-silica and 10 wt.% of silica-fume, when compared to the mixture containing only 0.5 wt.% of nano-silica. For mixtures containing supplementary cementitious material (SCM), there are no references about the combined effect of nano-silica and cement type on the rheological and mechanical properties, as well on the microstructure of Portland cement matrices. For a controlled granulometry, the present study aims to evaluate the effect of nano-silica on mechanical and rheological properties, as well on the microstructure of Portland cement matrices containing a fixed amount of supplementary cementitious materials and three different types of cement
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