Abstract: A cementitious binder, includes a hydraulic binder in an amount in the range from 50 to 80% by weight of the cementitious binder; a first siliceous based material in an amount in the range from 0.5 to 35% by weight of the cementitious binder, the first siliceous based material having a (SiO2)/(Al2O3) ratio by weight greater than 2.5; a second siliceous based material in an amount in the range from 10 to 25% by weight of the cementitious binder, the second siliceous based material being different from the first siliceous based material and having (a) a (SiO2)/(Al2O3) ratio by weight greater than 10 and (b) a BET specific surface area greater than 5 m2/g; and an aluminum based material in the range from 0 to 10% by weight of the cementitious binder and having a (SiO2)/(Al2O3) ratio by weight lower than 2.5, wherein 0.09<AlEFF/(AlEFF+SiEFF)<0.

Abstract: A cementitious binder, includes a hydraulic binder; a first siliceous based material, which has a (SiO2)/(Al2O3) ratio by weight greater than 2.5; a second siliceous based material, which is different from the first siliceous based material and has (a) a (SiO2)/(Al2O3) ratio by weight greater than 10 and (b) a BET specific surface area greater than 5 m2/g; and an aluminum based material, which has a (SiO2)/(Al2O3) ratio by weight lower than 2.5, wherein 0.09<AlEFF/(AlEFF+SiEFF)<0.28, where AlEFF=molar content of alumina in the hydraulic binder, and SiEFF=molar content of silica in the first siliceous based material for particles having a size lower than 3 ?m+molar content of silica in the second siliceous based material.

Abstract: New cement binders characterised by including: 30-80% by weight of a first component having MgO and at least one magnesium carbonate having the general formula: w MgC03.x MgO.y Mg(OH)2.z H2O (A) in which w is a number equal to or greater than 1; at least one of x, y or z is a number greater than 0 and w, x, y and z may be (but need not be) integers and 20-70% by weight of a second component including a least one silicon and/or aluminium oxide containing material are disclosed. They can be used to produce building materials (cements, mortars, grouts and the like) having improved structural properties relative to prior art materials. In particular, their manufacture is less energy intensive than e.g. Portland cement making them environmentally friendly in the sense that processes for their manufacture have a relatively low carbon footprint.

Abstract: A process for producing a cement binder composition including one or more magnesium carbonates having the general formula w MgCO3. x MgO. y Mg(OH)2 . z H2O in which w is a number equal to or greater than 1, at least one of x, y and z is a number greater than 0 and w, x, y and z may be (but need not be) integers is described. The process is characterised by (a) heating magnesite to liberate carbon dioxide gas and produce a solid product including magnesium oxide and (b) contacting an aqueous mixture including the magnesium oxide produced in step (a) with a source of carbonate ions at a temperature in the range 25 to 120° C. to produce at least one of the magnesium carbonates.

Abstract: This invention relates to a cement binder composition and to the use of the binder composition in construction products. The cement binder composition is based on MgO that absorbs CO2 when hardening. The binder composition of the present invention also comprises at least one magnesium carbonate (either hydrated or unhydrated) having the formula xMgCO3-yMg(OH)2-zH2O, wherein x is at least 1, and at least one of y or z is greater than 0. The binder composition may optionally comprise a hydroscopic material, for example NaCl. The MgO when mixed with water in the presence of the magnesium carbonate produces magnesium hydroxide that has a rosette-like morphology (as shown).

Abstract: This invention relates to a cement binder composition and to the use of the binder composition in construction products. The cement binder composition is based on MgO that absorbs CO2 when hardening. The binder composition of the present invention also comprises at least one magnesium carbonate (either hydrated or unhydrated) having the formula xMgCO3—yMg(OH)2—zH2O, wherein x is at least 1, and at least one of y or z is greater than 0. The binder composition may optionally comprise a hydroscopic material, for example NaCl. The MgO when mixed with water in the presence of the magnesium carbonate produces magnesium hydroxide that has a rosette-like morphology (as shown).