Application of a-SiO2 Rich Additives in Cement Paste

Jaroslav Pokorný; Milena Pavlíková; Eva Navrátilová; Pavla Rovnaníková; Zbyšek Pavlík; Robert Černý

doi:10.4028/www.scientific.net/AMM.749.362

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 749Application of a-SiO2 Rich Additives in Cement...

Application of a-SiO₂ Rich Additives in Cement Paste

Abstract:

The effect of a-SiO₂ of various origin on the properties of cement paste with incorporated different silica containing materials is experimentally studied in the paper. For the applied a-SiO₂ materials, basic physical and chemical properties are accessed, together with their chemical composition. Amount of amorphous phase of SiO₂ in particular siliceous materials is determined using XRD analysis. Matrix density, bulk density, total open porosity, compressive and bending strength are measured for all developed pastes with incorporated a-SiO₂ containing materials, together with initial and final setting time of fresh mixtures. The obtained data give evidence on a high and fast reaction activity of tested siliceous materials which results in a significant improvement of porosity and mechanical strength of a-SiO₂ modified cement pastes.

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Periodical:

Applied Mechanics and Materials (Volume 749)

Pages:

362-367

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.749.362

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Online since:

April 2015

Authors:

Jaroslav Pokorný, Milena Pavlíková, Eva Navrátilová, Pavla Rovnaníková, Zbyšek Pavlík, Robert Černý

Keywords:

Amorphous Silica (a-SiO₂), Basic Physical Properties, Cement Paste, Chemical Composition, Fine Grained Material, Mechanical Physical Properties, Pozzolanic Activity, Setting Time

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