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Passivation of reinforcing steel in reactive MgO cement blended with Portland cement
Reactive MgO cement (RMC) has an ability to gain strength by carbonation. One of the main concerns in RMC systems is the potential corrosion of reinforcing steel in structural applications. This study evaluated the feasibility of replacing small proportions of RMC with Portland cement (PC) to promote the passivation of reinforcing steel. Reinforcing steels embedded in RMC with different proportions of PC were investigated by electrochemical measurements and microstructural analysis. Pore solutions extracted from these pastes were evaluated for their chemical compositions. Inclusion of ≥2% PC enabled the passivation of steel. Passive film forming in RMC-PC blends consisted of Fe 3 O 4 and Mg(OH) 2 , which was thicker than those in pure PC mixes. The formation of passive film was mainly attributed to the increased pH of the pore solution, which reached over 12 in RMC mixes containing only 2% PC. These findings highlighted the potential of using RMC mixes in reinforced concrete applications.
Passivation of reinforcing steel in reactive MgO cement blended with Portland cement
Reactive MgO cement (RMC) has an ability to gain strength by carbonation. One of the main concerns in RMC systems is the potential corrosion of reinforcing steel in structural applications. This study evaluated the feasibility of replacing small proportions of RMC with Portland cement (PC) to promote the passivation of reinforcing steel. Reinforcing steels embedded in RMC with different proportions of PC were investigated by electrochemical measurements and microstructural analysis. Pore solutions extracted from these pastes were evaluated for their chemical compositions. Inclusion of ≥2% PC enabled the passivation of steel. Passive film forming in RMC-PC blends consisted of Fe 3 O 4 and Mg(OH) 2 , which was thicker than those in pure PC mixes. The formation of passive film was mainly attributed to the increased pH of the pore solution, which reached over 12 in RMC mixes containing only 2% PC. These findings highlighted the potential of using RMC mixes in reinforced concrete applications.
Passivation of reinforcing steel in reactive MgO cement blended with Portland cement
Mi, Tangwei (author) / Yang, En-Hua (author) / Unluer, Cise (author)
2023-10-01
Mi, T, Yang, E-H & Unluer, C 2023, 'Passivation of reinforcing steel in reactive MgO cement blended with Portland cement', Cement and Concrete Composites, vol. 143, 105269. https://doi.org/10.1016/j.cemconcomp.2023.105269
Article (Journal)
Electronic Resource
English
Passivation of reinforcing steel in reactive MgO cement blended with Portland cement
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