Influence of Magnesium Oxide on Carbonation of Cement Paste Containing Limestone and Metakaolin

Tao Jiang and Ying Jin
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Tao Jiang: Test Station for Mechanics and Structural Engineering, National Center for Materials Service Safety, University of Science and Technology Beijing, Kunlun Road 12, Beijing 102206, China
Ying Jin: Test Station for Atmospheric Environment Corrosion, National Center for Materials Service Safety, University of Science and Technology Beijing, Kunlun Road 12, Beijing 102206, China

Sustainability, 2022, vol. 14, issue 9, 1-9

Abstract: One of the major durability concerns for limestone calcined clay cement (LC 3 ) concrete is its high susceptibility to atmospheric carbonation that could lead to an early onset of electrochemical corrosion of reinforcing steel in concrete structures. Aimed at designing innovative LC 3 formulations with potentially enhanced carbonation resistance, this preliminary study investigates the influence of reactive magnesia (MgO) on the early-age strength development, hydrates assemblage, and atmospheric carbonation resistance of ternary ordinary Portland cement-metakaolin-limestone blends with a constant 45% ordinary Portland cement (OPC) replacement level. The results show that the MgO addition impedes the formation of AFm phases (hemicarbonate and monocarbonate), likely through interfering reactions between metakaolin and portlandite. The formed brucite due to MgO hydration can uptake atmospheric CO 2 to some extent, but at a considerably slower rate, in comparison with other hydrates in LC 3 including AFm, AFt, and portlandite. The enhancement of carbonation resistance of LC 3 pastes is insignificant by MgO addition of less than 5%.

Keywords: LC3; low-carbon binder; natural carbonation; durability of concrete; MgO (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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