Carbonation and Phase Evolution in MgO-SiO₂ Cements: Impact on Strength.

ABSTRACT: Magnesium silicate hydrate (M-S-H) binders, synthesized from magnesia and silica, exhibit promising mechanical and thermal properties but face challenges in early strength development due to delayed kinetics and limited MgO solubility. This study investigates the impact of early exposure to CO₂-saturated atmospheres on MgO-SiO₂ cementitious systems, emphasizing the role of carbonation in phase evolution and mechanical performance. Early carbonation promotes the formation of hydrated magnesium hydroxycarbonates (HMHC), altering hydration pathways and reducing M-S-H gel content. Key analyses, including XRD, TGA, SEM-EDS, and FTIR, reveal that higher carbonation levels correlate with reduced Mg(OH)₂ stability at early ages, an enhanced precipitation of HMHC ph

SUBMITTER: Marmol G 

PROVIDER: S-EPMC11902274 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature