Micro structure of glass state cementing materials containing small amount of calcium, such as slag, phosphorous slag and fly ash, was studied by SEM and XRD.

In the paper, 10%-20% clinker and lots of waste slag, such as slag, steel slag, were used to prepared green cementing materials with the grade of cement 325 or 425.

The concept of fly ash-saturation was put forward based on the index of maximum compressive strength and optimal unit strength factor of fly ash in cementing materials, respectively.