In the case of white cement clinker, the existence of amorphous silica must have contributed
much to the microwave absorption of the samples. Our previous study (8) suggested that the
lowered viscosity of amorphous silica and, therefore, the enhanced ion diffusion during
microwave radiation are the main mechanisms of microwave enhancement in the reaction of
the materials containing amorphous silica. These mechanisms should hold in the case of the
white cement clinker since the raw mixture contained amorphous silica (Ludox).