Response of alkali activated fly ash mortars to microwave curing |
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| Authors: | Jeevaka Somaratna Deepak Ravikumar Narayanan Neithalath |
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| Affiliation: | 1. ERU, Civil Eng. Dept., Kayseri, Turkey;2. Kahramanmara? Sütçü ?mam University, Kahramanmara? Vocational School, Kahramanmara?, Turkey;3. Mersin University, Civil Engineering Department, Mersin, Turkey;4. Epoka University, Civil Engineering Department, Albania;1. Department of Building Technology, Faculty of Industrial Technology, Phranakhon Rajabhat University, Changwattana Road, Bangkhen, Bangkok 10220, Thailand;2. Center of Excellence in Electromagnetic Energy Utilization in Engineering (CEEE), Thammasat University (Rangsit Campus), Khlong Luang, Prathum Thani 12121, Thailand;3. Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA |
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| Abstract: | Volumetric heating provided by microwave curing results in faster property development as compared to conventional heat curing that relies on heat conduction from the skin to the core. This paper discusses the compressive strength and microstructure development of microwave cured NaOH activated fly ash mortars, and relates them to the microwave energy absorption by the material which is a function of its dielectric properties. Microwave curing parameters are chosen so as to eliminate the effects of thermal runaway. Strengths that are comparable to or greater than those of mortars heat cured for 48 h at 75 °C are obtained in less than 120 min of microwave curing. The rate of energy absorption by the mortars is found to be relatively constant for a considerable fraction of the microwave curing duration, attributable to the compensation for the drop in dielectric loss factor as a result of moisture loss by the increase in internal electric field. Compressive strength is shown to be related to the microwave energy absorbed by the specimens, especially during the time when free water is present in the system. |
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