A microwave sintering method was used to prepare C3S from precipitated CaCO3, Ludox (SiO2), and Al(OH)3 or Fe2O3. Brunauer-Emmett-Teller (BET), X-ray diffraction, scanning electron microscopy, and calorimetry were used to characterize the sintered samples. The results indicate that heating rate played a very important role in C3S formation in conventional sintering. Microwave sintering resulted in improved formation of C3S compared to conventional sintering, even at the same heating rates. After sintering at 1500°C samples prepared using microwaves were still porous, with a specific surface area of about 0.4 m2/g. Microwave formation of C3S was achieved at temperatures as low as 1350°C when using Al2O3 additions. The use of Fe2O3 as an additive was not as effective in promoting C3S formation as expected. Microwave effects on sintering as well as the sintering setup are also discussed in this paper.
All Science Journal Classification (ASJC) codes
- Building and Construction
- Materials Science(all)