Method for the production of a cementitious material

A method for producing a cementitious material, the method comprising:

• mixing 100 parts by weight of a first mixture with 8 to 12 parts by weight of water to obtain a first slurry, said first mixture comprising from 20 to 25% by weight of a cement selected from the group consisting of Portland cement, limestone cement, slag cement, pozzolanic cement, composite cement and mixtures thereof, from 0 to 6% by weight of calcium sulfate, and from 65 to 80% by weight of inert material, and having a SO3 content by weight from 1 to 4%,
• after obtaining the first slurry, mixing 100 parts by weight of a second mixture with 30 to 45 parts of water to obtain a second slurry, said second mixture comprising from 85 to 100% by weight of a cement selected from the group consisting of calcium sulfoaluminate (CSA) cement, aluminous cement and mixtures thereof, and from 0 to 15% by weight of inert material, and having a SO3 content from 5 to 13% by weight, and
• adding said second slurry to the first slurry with a ratio of 0.10 to 0.20 by weight between the second slurry and the first slurry, and mixing to obtain said cementitious material.