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Mechanism of reactive magnesia-ground granulated blastfurnace slag soil stabilization
Reactive magnesia (MgO)-activated ground granulated blastfurnace slag (GGBS), with fixed GGBS dosages but varying MgO/GGBS ratios, was used for stabilization of two soils and compared with brucite (Mg(OH)^sub 2^)-activated GGBS and hydrated lime (Ca(OH)^sub 2^)-activated GGBS. A range of tests, including unconfined compressive strength testing, X-ray diffraction, and scanning electron microscopy, was conducted to study the mechanical, chemical, and microstructural properties of the stabilized soils, and then to investigate the mechanism of MgO-GGBS soil stabilization. Results indicate that the Mg(OH)^sub 2^ had a minimal activating efficacy for GGBS-stabilized soil, while the reactive MgO yielded a higher activating efficacy than the Ca(OH)^sub 2^. The activator-soil reactions in the stabilized soil slowed down the activating reaction rate for GGBS; this effect was less significant in MgO-GGBS-stabilized soil than in Ca(OH)^sub 2^-GGBS-stabilized soil, and hence the GGBS hydration rate in the former was less reduced by the soil than the latter. The Mg^sup 2+^ and OH- ions produced from MgO dissolution participated in the GGBS hydration reactions without precipitating Mg(OH)^sub 2^. The common hydration products in all GGBS-stabilized soils were calcium silicate hydrate-like compounds. Additionally, hydrotalcite and calcite could be produced in MgO-GGBS- and Ca(OH)^sub 2^-GGBS-stabilized soils, respectively, especially with a high activator/GGBS ratio.
Mechanism of reactive magnesia-ground granulated blastfurnace slag soil stabilization
Reactive magnesia (MgO)-activated ground granulated blastfurnace slag (GGBS), with fixed GGBS dosages but varying MgO/GGBS ratios, was used for stabilization of two soils and compared with brucite (Mg(OH)^sub 2^)-activated GGBS and hydrated lime (Ca(OH)^sub 2^)-activated GGBS. A range of tests, including unconfined compressive strength testing, X-ray diffraction, and scanning electron microscopy, was conducted to study the mechanical, chemical, and microstructural properties of the stabilized soils, and then to investigate the mechanism of MgO-GGBS soil stabilization. Results indicate that the Mg(OH)^sub 2^ had a minimal activating efficacy for GGBS-stabilized soil, while the reactive MgO yielded a higher activating efficacy than the Ca(OH)^sub 2^. The activator-soil reactions in the stabilized soil slowed down the activating reaction rate for GGBS; this effect was less significant in MgO-GGBS-stabilized soil than in Ca(OH)^sub 2^-GGBS-stabilized soil, and hence the GGBS hydration rate in the former was less reduced by the soil than the latter. The Mg^sup 2+^ and OH- ions produced from MgO dissolution participated in the GGBS hydration reactions without precipitating Mg(OH)^sub 2^. The common hydration products in all GGBS-stabilized soils were calcium silicate hydrate-like compounds. Additionally, hydrotalcite and calcite could be produced in MgO-GGBS- and Ca(OH)^sub 2^-GGBS-stabilized soils, respectively, especially with a high activator/GGBS ratio.
Mechanism of reactive magnesia-ground granulated blastfurnace slag soil stabilization
Yi, Yaolin (author) / Liska, Martin / Jin, Fei / Al-Tabbaa, Abir
2016
Article (Journal)
English
Ions , Magnesium compounds , X-rays , Slag , Carbonates , Magnesium , Diffraction , Usage , Calcite crystals , Scanning electron microscopy , Analysis , Soils
Mechanism of reactive magnesia — ground granulated blastfurnace slag (GGBS) soil stabilization
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