Impact of hydrated magnesium carbonate additives on the carbonation of reactive MgO cements

Reactive magnesia (MgO) cements have emerged as a potentially more sustainable and technically superior alternative to Portland cement due to their lower production temperature and ability to sequester significant quantities of CO2. Porous blocks containing MgO were found to achieve higher strength...

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Bibliographic Details
Published in:Cement and concrete research 2013-12, Vol.54, p.87-97
Main Authors: Unluer, C., Al-Tabbaa, A.
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Carbon capture and storage
Carbon dioxide
Carbonation
Carbonation (C)
Cement concrete constituents
Cements
Compressive strength (C)
Corrosion
Durability. Pathology. Repairing. Maintenance
Exact sciences and technology
Magnesium carbonate
Magnesium oxide
Materials
MgO (D)
Microstructure (B)
Portland cements
Properties and test methods
Properties of anhydrous and hydrated cement, test methods
Strength
Strength of materials (elasticity, plasticity, buckling, etc.)
Structural analysis. Stresses
Thermal analysis (B)
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Summary:Reactive magnesia (MgO) cements have emerged as a potentially more sustainable and technically superior alternative to Portland cement due to their lower production temperature and ability to sequester significant quantities of CO2. Porous blocks containing MgO were found to achieve higher strength values than PC blocks. A number of variables are investigated to achieve maximum carbonation and associated high strengths. This paper focuses on the impact of four different hydrated magnesium carbonates (HMCs) as cement replacements of either 20 or 50%. Accelerated carbonation (20°C, 70–90% RH, 20% CO2) is compared with natural curing (20°C, 60–70% RH, ambient CO2). SEM, TG/DTA, XRD, and HCl acid digestion are utilized to provide a thorough understanding of the performance of MgO-cement porous blocks. The presence of HMCs resulted in the formation of larger size carbonation products with a different morphology than those in the control mix, leading to significantly enhanced carbonation and strength. •Carbonation of MgO cements can provide sustainable carbon capture and storage.•Replacing some MgO with hydrated magnesium carbonates (HMCs) enhances carbonation.•Using light and heavy HMCs alters microstructure and carbonation mechanism.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2013.08.009