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The effects of carbonation on the strength and microstructural evolution of MgO-activated reactive SiO 2  (M-A-R-S) mortars under different conditions have been investigated. M-A-R-S mortars with a binder-to-silica sand ratio of 50% were prepared by light-calcined MgO and silica fume (SF) under accelerated carbonation at 20% CO 2  condition for different periods. Carbonation significantly increases the compressive strength of M-A-R-S mortars. The specimens cured for 28 days in air and placed to accelerated carbonation for ∼14 days achieved the highest strength of ∼83 MPa and the lowest porosity of 13.5%. The increased strength and density resulted from the formation of the hydrated magnesium carbonate (i.e. nesquehonite (MgCO 3 ·3H 2 O) with a needle/column-like morphology. However, it was also found that continuous carbonation for longer periods (e.g. 28 days), associated with excessive carbonated phase(s) formed, caused micro-cracking and a reduction in compressive strength.

Effect of hydrated magnesium carbonate grown in situ on the property of MgO-activated reactive SiO 2 mortars