Piezoelectric ceramics based on PZT ceram-ics were prepared in solid state reaction with mixture ofPbO,TiO<sub>2</sub> and ZrO<sub>2</sub>,etc.XRD and SEM were
This paper reports the experiments of chemi-cal and physical activation of γ-C<sub>2</sub>S and their results.Chemi-cal activation is that the addition of acti
In this paper,the effect and mechanism of calcareous stone powder with size less than 0. 074mm are investigated in stone chippings concrete. The results show th