Patent ID: 9011597
Filing Date: 2015-04-21
Classification: C02F,C04B,Y02W

Abstract:
1. A method for preparing a composite material from a starting material consisting of sludge waste and from a dry cement mixture, the method comprising: putting into contact, without adding water, the sludge waste and the dry cement mixture and mixing the sludge waste and the dry cement mixture whereby a composite material which cannot be pumped is obtained, wherein no other additives are added during any of the steps of the method, wherein the sludge waste has a dryness between 20 and 65%; a mass ratio between the sludge waste (mass expressed in g) and the dry cement mixture (mass expressed in g) is between 0.3 and 1; and wherein the dry cement mixture is selected from the group consisting of: (i) Portland Cement; (ii) Composite Portland Cement consisting of Portland Cement and one or more ingredients selected from the group consisting of blast furnace slags, silica fume, pozzolan, fly ashes, calcined shale and limestone; (iii) aluminous cement mixture having a clinker consisting of greater than 50% calcium aluminates and the remainder being one or more ingredients selected from the group consisting of calcium silicates, tetracalcium aluminunoferrite, Al (iv) sulfo-aluminous cement mixture having a clinker consisting of between 28 and 40% of Al (v) ferro-aluminous cement mixture having a clinker consisting of between 25 and 30% of Al (vi) mixtures of two or more of (i) through (v).