Silica fume is considered as an ideal modelling material for reactive pozzolans used in concrete.
硅灰是用以研究混凝土用的活性火山灰质材料的理想模型材料。
2
I can hardly imagine other pozzolans for long periods of great under business card printing device operation can be continuous.
很难联想在恒久很不小飞尘的境况下制卡摆设的运怠工可以不断精良的举行。
3
Calcium chloride is added to reduce setting time, gypsum to increase setting time, barite and hematite to increase density, and bentonite and pozzolans to decrease density.