Hydration kinetics and products of MgO-activated blast furnace slag. (20th July 2020)

• Record Type: Journal Article
• Authors: Park, Solmoi; Park, Hyeong Min; Yoon, H.N.; Seo, Joonho; Yang, Cheol-Min; Provis, John L.; Yang, Beomjoo
• Is Part Of: Construction & building materials. Volume 249(2020)
• Publication Date: 2020-07-20
• Subjects: Blast furnace slag -- MgO -- Characterization -- Thermodynamic modelling -- Hydration; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2020.118700
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: The hydration kinetics of MgO-activated blast furnace slag is studied. The main hydration products include a C-A-S-H type gel, ettringite, monosulfate, hydrotalcite, and TAH. Higher MgO increases the degree of reaction of slag. Higher MgO increases the solid binder volume, and the strength of the samples. Abstract: Hydration kinetics and products of MgO-activated slag are investigated by employing multiple analytical characterization techniques and thermodynamic modelling. The main hydration products of this cement are a calcium-aluminosilicate hydrate type gel, ettringite, monosulfate, hydrotalcite, brucite, and a third aluminate hydrate, while the extent of reaction and formation of reaction products significantly varied by MgO dosages. Higher dosage of MgO increased the degree of reaction of slag, and led to a higher population of Al in the octahedral region, which can be attributed to greater competition for Al required for the formation of hydrotalcite. The experimental and simulated volume of the solid binder increased as the MgO dosage increased, showing a good correlation with the strength increase of the samples with higher MgO dosage.