Micro-silica for high-end application from carbon capture and storage by mineralisation

Aimaro Sanna*, Marco Dri, Xiao Long Wang, Matthew R. Hall, M Mercedes Maroto-Valer

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Citations (Scopus)


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.

Original languageEnglish
Title of host publicationNovel and Non-Conventional Materials and Technologies for Sustainability
EditorsYan Xiao, Zhi Li, Rui Wang, Bo Shan, Khosrow Ghavami
PublisherTrans Tech Publications
Number of pages8
ISBN (Print)9783038138495
Publication statusPublished - 2012
Event13th International Conference on Non-Conventional Materials and Technologies - Changsha, China
Duration: 22 Sept 201124 Sept 2011

Publication series

NameKey Engineering Materials
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795


Conference13th International Conference on Non-Conventional Materials and Technologies
Abbreviated title13NOCMAT 2011


  • ASH
  • SLAG
  • waste material
  • Silica
  • recycled materials
  • mortar
  • CCCM


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