Experimental Investigations and Modeling of Microwave-Thermal Accelerated-Curing of Concrete


  • Natt Makul Industrial Technology


The use of microwave energy to acceleratingly cure concretes was presented. First, we measured the dielectric permittivity of concrete during a 24-hour first-hydration period at a operating frequency of 2.45 GHz. Second, we investigated, experimentally and theoretically, the characteristics of concrete as subjected to microwave energy with a multi-mode system, with specific attention to temperature rise, compressive strength, and the use of the maturity function. The results show that dielectric permittivity is relatively high and remains constant during the dormant period. After this period, the hydration reaction resumes and dielectric permittivity decreases rapidly. With the use of microwave heating, early-age strength increases during the first 14 days; however, during the next 14 days, early-age strength decreases slightly, until it reaches its lowest at the 28-day mark. The temperature rise as actually recorded at the center of the specimen during microwave heating in our experiment consistently agreed with figures calculated by a mathematical model.


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