Portland calcined clay cement with limestone

摘要

Cement comprising Portland cement clinker and a complementary cementitious material, characterized in that the complementary cementitious material consists of a) a calcined clay produced at a temperature between 500 ° C and 900 ° C and b) a carbonate material selected from the group comprising limestone, carbonate of magnesium, calcium and magnesium carbonate, or mixtures thereof, in which said carbonate material has been ground to a specific surface area of 3000-15000 cm2 / g determined using the Blaine method described in EN 196 , and in which only the clay material has been heat treated, and in which the weight ratio of calcined clay material with respect to carbonate material is between 0.25 and 3, and in which the cement comprises 15 to 90% w / w of the complementary cementitious material.