The short setting time of Cement 1 is clearly due to the formation of C11A7.CaF2. This is a component of "Jet" cement and exhibits rapid setting. The burning conditions in the kiln when this clinker was produced need to be analysed to ascertain why this compound was formed and then those burning conditions must be avoided.

It is likely to lengthen the setting time.

The role of CaF2 in white clinker manufacture is to mineralise the combination of the raw minerals into the clinker minerals. This is difficult in white cement due to the low flux content as a consequence of the low Fe2O3 content. CaF2 can be expected to lengthen the setting time of cement.

Calcium chloride is the most commonly used accelerator.

Both white and grey cements are Ordinary Portland cements, but white cement has a low iron content which means that its colour is much lighter (almost white) compared with normal grey Portland cement. There are some differences in the manufacturing process relating to the burning in the kiln and the cooling of the clinker. Manufacturing white ...