%0 Journal Article
%T Synthesis of a Green Nano-Silica Material Using Beneficiated Waste Dunites and Its Application in Concrete
%A A. Lazaro
%A G. Quercia
%A H. J. H. Brouwers
%A J. W. Geus
%J World Journal of Nano Science and Engineering
%P 41-51
%@ 2161-4962
%D 2013
%I Scientific Research Publishing
%R 10.4236/wjnse.2013.33006
%X <div align=\"justify\">
	Nano-silica, one of the substances boosting the field of nanomaterials, can be produced by dissolving olivine in acid. The dissolution of olivine is a convenient alternative route to the existing methods of nano-silica production (neutralization of sodium silicate and flame hydrolysis) because the olivine dissolution is a low temperature process making this method cheaper and greener. Furthermore, this process can use waste olivine materials for the production of nano-silica. The produced nano-silica has a specific surface area between 100 and 400 m<sup>2</sup>/g; a primary particle size between 10 and 25 nm, which is agglomerated in clusters; and an impurity content below 5 wt.%. In addition, olivine nano-silica can be classified as a pozzolanic material with an activity index of 101%. The optimum replacement level of olivine nano-silica in conventional vibrated concrete is around 5% by volume resulting in: 1) a compressive strength increase of 20%; 2) a CO<sub>2</sub> emission reduction of 3%. Therefore, the use of the olivine nano-silica in CVC does not only improve the compressive strength but also reduce the CO<sub>2</sub> emissions.
</div>
%K Olivine
%K Nano-Silica
%K CO&lt
%K sub&gt
%K 2&lt
%K /sub&gt
%K Reduction
%K Environmentally Friendly
%K Concrete
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=36671