Synthesis of nano-silica at low temperatures and its application in concrete

A. Lazaro, G. Quercia, H.J.H. Brouwers

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

88 Downloads (Pure)

Abstract

Nowadays, the two most important commercial processes in the production of nano-silica are the thermal route (also known as flame hydrolysis) and the wet route (e.g., the neutralization of sodium silicate solutions). A high temperature process is involved in both production methods. The production of nano-silica by the dissolution of olivine is an interesting alternative to the existing commercial methods because of the good quality of the resulting silica and low energy requirements and CO2 emissions. The produced nano-silica has a specific surface area between 100 and 400 m2/g; a primary particle size between 10 and 25 nm, which are 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 CO2 emission reduction of 3 %. Therefore, the use of the olivine nano-silica in CVC does not only improve the compressive strength but also reduces the CO2 emissions.
Original languageEnglish
Title of host publicationProceedings of the International Conference Non-Traditional Cement & Concrete V, June 16-19, 2014, Brno, Czech Republic,
Publication statusPublished - 2014
Event5th International Conference on Non-Traditional Cement and Concrete (NTCC2014), 16-19 June 2014, Brno, Czech Republic - Brno, Czech Republic
Duration: 16 Jun 201419 Jun 2014
http://www.fce.vutbr.cz/stm/fracture/symposium2014/

Conference

Conference5th International Conference on Non-Traditional Cement and Concrete (NTCC2014), 16-19 June 2014, Brno, Czech Republic
Abbreviated titleNTCC 2014
Country/TerritoryCzech Republic
CityBrno
Period16/06/1419/06/14
OtherNon-Traditional Cement & Concrete V (NTCC 2014)
Internet address

Fingerprint

Dive into the research topics of 'Synthesis of nano-silica at low temperatures and its application in concrete'. Together they form a unique fingerprint.

Cite this