Studies on the binder of fly ash fluorgypsum-cement

A new binder with high strength, good volume stability, and excellent water resistance has been developed using fly ash and fluorgypsum as main raw materials, as well as Portland cement as stimulator. The hydration process and microstructure of the binder were investigated with X-ray diffraction and scanning electron microscopy. The continuously pozzolanic reaction of fly ash, the transformation of anhydrite into gypsum, in appropriate quantity, and the homogeneous mixing of CSH gel, gypsum microcrystal, and the remaining anhydrite results in the formation of a dense paste structure, and consequently the good properties of the binder. (C) 1998 Elsevier Science Ltd.