MgO content of slag controls phase evolution and structural changes induced by accelerated carbonation in alkali-activated binders

By S. A. Bernal, Rackel San Nicolas, R. Myers, R. Mejía de Gutiérrez, F. Puertas, J. V. van Deventer, J. Provis. 2014

441 citations recorded by the source corpus.

The structural development and carbonation resistance of three silicate-activated slags (AAS) with varying MgO contents ( 5%), hydrotalcite is identified as the main secondary product in addition to C–A–S–H. Higher extent of reaction and reduced Al incorporation in the C–S–H product are observed with higher MgO content in the slag. These gel chemistry effects, and particularly the formation of hydrotalcite, seem to reduce the susceptibility to carbonation of AAS produced with higher MgO contents, as hydrotalcite appears to act as an internal CO2 sorbent. This is evidenced by an inverse relationship between natural carbonation depth and slag MgO content, for paste samples formulated at constant water/binder ratio. Thus, the carbonation performance of AAS can be enhanced by controlling the chemistry of the precursors.

Subfields: Building and Construction, Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/8ab9ac2d4fa70f5c87a174af0762ed23eab6c46f

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Citations in the corpus

Alkali-activated slag cements produced with a blended sodium carbonate/sodium silicate activator (2016, methodology): “, 2011), where the pre-induction period was observed during the first hour after mixing, followed by short induction periods (<10 h in metasilicateactivated slags with magnesium oxide contents lower than 8 wt% (Bernal et al., 2014)).”
Application of alkali-activated materials for water and wastewater treatment: a review (2019, methodology): “Typically, AAMs are able to decrease the mobility of cationic species effectively, whereas transition metals, which form oxyanionic species, remain less effectively stabilized (Bernal et al. 2014a, b).”