Building products

A formulation for preparing a cementitious product comprising:

• a cementitious material;
• a siliceous material;
• and
• a material formed by reacting a siliceous reactant with a calcareous reactant in the presence of water, the reaction being terminated prior to complete conversion of the reactants to calcium silicate hydrate such that the material is a mixture of calcium silicate hydrate and unreacted siliceous reactant.

A formulation for preparing a cementitious product comprising:

• a cementitious material;
• a siliceous material that reacts during autoclaving;
• and
• a material comprising substantially calcium silicate hydrate, the material being formed by reacting a siliceous reactant with a calcareous reactant in the presence of water, the reaction being terminated prior to complete conversion of the reactants to calcium silicate hydrate such that the material is a mixture of calcium silicate hydrate and unreacted siliceous reactant.

A method for forming a cementitious product comprising:

• forming a material comprising substantially calcium silicate hydrate, the material being formed by reacting a siliceous reactant with a calcareous reactant in the presence of water, the reaction being terminated prior to complete conversion of the reactants to calcium silicate hydrate such that the material is a mixture of calcium silicate hydrate and unreacted siliceous reactant;
• adding a cementitious material, a siliceous material and the mixture to water to form a slurry forming a green shaped article from the slurry;
• and
• curing the article in an autoclave.