2. Other cements

2.1 Natural Prompt Cement (NPC)

Natural prompt cement, which sets and hardens rapidly, is the result of firing a regular clayey limestone extracted from homogeneous beds at moderate temperatures, followed by very fine grinding.

Natural prompt cement is characterized by the presence of calcium silicates, mainly in the form of active dicalcium silicate, alumina-rich calcium aluminate and calcium sulfo-aluminate, which is specific to the product.

This type of cement is regulated by the NF P15-314...