Micro-Silica for High-End Application from Carbon Capture and Storage by Mineralisation

Abstract:

Waste silica remaining after the Carbon Capture and Storage by Mineral carbonation (CCSM) could represent a potential pozzolan material for partial replacement in concrete. The objective of this work was the production and testing of cement gel cubes with the residual-silica by-product obtained from the accelerated carbonation of Mg-silicate rocks. The silica produced was characterised in terms of its chemical composition, morphology and LOI. Also, the silica was used as an additive to the cement (CEM I class) in order to assess the effect on (28 days) compressive strength in comparison with a cement control specimen. The influence of different cement replacement percentages (5% and 10wt.% silica) were determined by measuring initial setting times and compressive strength. The compressive strength of the cement specimens with 5 and 10wt.% silica as pozzolan replacement of Portland cement were 3% and 8% higher than the control cubes indicating that the residual silica powder may have pozzolanic properties. However, high LOI and magnesium content might represent a limit in high-end applications and further work is required to identify optimised CCSM conditions able to reduce the impurities in the silica by-product and to establish their potential as a pozzolan.

• Periodical: Key Engineering Materials (Volume 517)
• Pages: 737-744
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.517.737
• Online since: June 2012
• Authors: Aimaro Sanna, Marco Dri, Xiao Long Wang, Matthew R. Hall, Mercedes Maroto-Valer
• Keywords: CCCM, Mortar, Recycled Material, Silica, Waste Material

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