Abstract
Aiming at the problem that aggregated or flocculated cement particles negatively affect the development of mechanical properties of cement-based materials. This paper investigates the effects of ultrasonic action on the compressive strength, dispersion, heat of hydration, rheology, and micromorphology of cement-based materials with ultrasonic dispersion of freshly mixed cement paste. Moreover, the ultrasonic strengthening mechanism of cement-based materials is proposed. The results show that the ultrasonic action can effectively disperse cement particles, strengthen the mechanical properties, reduce the dynamic yield stress and apparent viscosity of the paste, and accelerate the early hydration rate. Notably, ultrasound-induced hydration is the fundamental reason for strengthening the mechanical properties.
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