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The role of brucite, ground granulated blastfurnace slag, and magnesium silicates in the carbonation and performance of MgO cements
Highlights The role of brucite, slag, and magnesium silicates on MgO carbonation was studied. Suitability of each additive to replace MgO in carbonated systems is reported. Mixes with talc and serpentine achieved complete carbonation and high strengths. GGBS mixes performed better under natural curing when MgO can act as an activator. Brucite, talc, and serpentine are potential replacements of MgO at reported levels.
Abstract This study focuses on the enhancement of the technical and environmental performance of MgO cements through the inclusion of brucite, GGBS, talc and serpentine as partial MgO substitutes in concrete blocks. The influence of these additives on the microstructure, hydration, carbonation, and mechanical performance of blocks cured under natural and elevated CO2 conditions is presented. An optimum replacement level was determined for each composition via unconfined compressive strength (UCS), scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and acid digestion. Mixes subjected to accelerated carbonation indicated up to 100% carbonation in 7days. Results highlight the suitability of each additive in replacing MgO without compromising performance.
The role of brucite, ground granulated blastfurnace slag, and magnesium silicates in the carbonation and performance of MgO cements
Highlights The role of brucite, slag, and magnesium silicates on MgO carbonation was studied. Suitability of each additive to replace MgO in carbonated systems is reported. Mixes with talc and serpentine achieved complete carbonation and high strengths. GGBS mixes performed better under natural curing when MgO can act as an activator. Brucite, talc, and serpentine are potential replacements of MgO at reported levels.
Abstract This study focuses on the enhancement of the technical and environmental performance of MgO cements through the inclusion of brucite, GGBS, talc and serpentine as partial MgO substitutes in concrete blocks. The influence of these additives on the microstructure, hydration, carbonation, and mechanical performance of blocks cured under natural and elevated CO2 conditions is presented. An optimum replacement level was determined for each composition via unconfined compressive strength (UCS), scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and acid digestion. Mixes subjected to accelerated carbonation indicated up to 100% carbonation in 7days. Results highlight the suitability of each additive in replacing MgO without compromising performance.
The role of brucite, ground granulated blastfurnace slag, and magnesium silicates in the carbonation and performance of MgO cements
Unluer, C. (author) / Al-Tabbaa, A. (author)
Construction and Building Materials ; 94 ; 629-643
2015-07-14
15 pages
Article (Journal)
Electronic Resource
English
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