Impact of hydrated magnesium carbonate additives on the carbonation of reactive MgO cements
Date of Issue2013
School of Civil and Environmental Engineering
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.
DRNTU::Engineering::Civil engineering::Structures and design
Cement and concrete research
© 2013 Elsevier Ltd. This is the author created version of a work that has been peer reviewed and accepted for publication by Cement and Concrete Research, Elsevier Ltd. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.cemconres.2013.08.009].