Novel Cement-based Composites under Low Pressure and Microwave Energy.

      Аннотация: In this study, cementitious materials (here defined as a high-performance cement paste produced by mixing Type 1 Portland cement with an effective amount of water) were manufactured in accelerated conditions using microwave-assisted low-pressure processing (i.e., accelerated curing). Based on the concept that the hydration reaction of cementitious materials comprises three main periods—a dormant period, an acceleration period, and a deceleration period—process parameters were determined for the most effective period (acceleration) for producing paste via microwave processing. The time-dependent dielectric characteristics of the cementitious paste and the water–cement ratio by mass influenced the temperature, i.e., caused it to increase, and the properties of the microwave-cured paste.

Ключевые слова: heat and mass transfer, microwave energy, vacuum, Concrete