Cementitious mixtures

A cementitious mixture including:

• a light weight material, cement, resin, sand, fibrous material, and water;
• the relative concentrations of the constituent components being adjusted according to a predetermined formulation to provide a settable liquid or mobile solid such that, when set into a solid, the solid possesses a predetermined selection of parameters comprising sound insulation, thermal insulation and fire rating of the solid together with two or more parameters selected from available parameters, said available parameters including density and compressive strength.

A lightweight concrete building material formulated from a slurry prepared by mixing 6 kg cement, 1 kg sand, 3 litres water and 1 litre resin in a 20 litre bucket to form a runny paste, combining 54 litres polystyrene beads and 50 ml fibre to form an even mix, adding the slurry thereto and mixing such that the lightweight material (polystyrene) has an even coating of slurry to form a cementitious mixture, pouring the cementitious mixture into a mold and allowing it to set over a period of 24 hours to form a solid, and allowing the solid a further period of time to air dry, wherein the resin comprises carboxylated butadiene styrene latex.