Early Hydration Kinetics and Microstructure Development of MgO-Activated Slag at Room Temperature

Hongqiang Ma; Chao Wu

doi:10.1061/(asce)mt.1943-5533.0004548

October 26, 2022Journal of Materials in Civil Engineering

Early Hydration Kinetics and Microstructure Development of MgO-Activated Slag at Room Temperature

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Key Points

To evaluate the early hydration kinetics and microscopic structural development of slag activated by different types of reactive magnesium oxide at room temperature.
Tested three variations of reactive magnesium oxide categorized by their reaction times as alkali activators.
Tracked hydration heat output and characterized phase evolution using X-ray diffraction, thermogravimetry, and Fourier transform infrared spectroscopy.
Examined pore architecture and matrix morphology using mercury intrusion porosimetry and scanning electron microscopy–energy dispersive spectrometry.
Magnesium oxide activation initiated early slag hydration at ambient temperature, producing measurable heat release and chemical transformation.
Hydration product formation and pore structure densification developed progressively in relation to the reactivity of the magnesium oxide activator.

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Implication

Experimental study reveals early hydration kinetics and microstructure evolution in magnesium oxide-activated slag, highlighting mechanisms for eco-friendly cementitious binder design.

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Ma et al. (2022) studied this question.

synapsesocial.com/papers/6aa39e051cbf551a1af4210c https://doi.org/10.1061/(asce)mt.1943-5533.0004548

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Early Hydration Kinetics and Microstructure Development of MgO-Activated Slag at Room Temperature

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Early Hydration Kinetics and Microstructure Development of MgO-Activated Slag at Room Temperature

Key Points

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