摘要:
The present invention relates to a cement comprising Portland cement clinker and a clinker replacement material, wherein the clinker replacement material comprises a carbonate material and a clay material, the clay material being characterised in that the carbonate material and/or the clay material has been treated in such a way that no chemical reaction occurs between the clay minerals and the carbonate material.
摘要:
The invention relates to a bonding pre-mixture containing: 0.2% to 63% of a material of an ultrafine granulometric class that contains individual D90 particles of less than 1 μm and/or of a specific BET surface area greater than 5 m 2 /g; 8% to 63% of selected Portland cement that contains D90 particles of less than 30 μm; and 25% to 85% of a material, other than the cement, of a fine granulometric class that contains particles, the D10 and D90 of which are 1 μm to 120 μm and of a specific BET surface area greater than 5 m 2 /g. The invention also relates in particular to a bonding mixture that contains particles, the D10 and D90 of which are 120 μm to 5 mm, in addition to the pre-mixture of a material of a medium granulometric class.
摘要:
The present invention relates to a method for the treatment of a concrete surface, which comprises -at least partially covering the surface with a first coating which is substantially transparent and substantially impermeable to water; and -at least partially covering said first coating with a second coating which is substantially transparent and photocatalytic; -the surface having an average roughness R a less than about 10µm.
摘要:
A concrete mix useful for producing concrete products having anti-efflorescence properties and a method for making such concrete products are provided. The concrete mix includes a hydraulic cement binder, aggregates and as an additive an ultrafine particulate material including carrier particles being surface treated with an efflorescence control agent. The method for making concrete includes a first step of mixing the hydraulic cement binder, aggregates, water and the ultrafine particulate material, a second step of pouring the mixture so obtained into a form, and a third step of curing the mixture.
摘要:
A cementitious matrix for Ultra-High Performance Fibre Reinforced Concrete (UHPFRC) containing the following constituents (in % mass of dry mix): a) 25 to 65 % Portland cement type CEM I; b) 25 to 70 % of Limestone filler; c) 5 to 15 % ultrafine mineral additions; d) 0 to 50 % fine sand with a diameter superior to 100 mm and lower than 5 mm. The invention also provides the corresponding UHPFRC cementitious mixture and element.
摘要:
The present invention relates to a cement comprising Portland cement clinker and a clinker replacement material, wherein the clinker replacement material comprises a carbonate material and a clay material, the clay material being characterised in that the carbonate material and/or the clay material has been treated in such a way that no chemical reaction occurs between the clay minerals and the carbonate material.
摘要:
The invention relates to a dry binder pre-mix containing by weight percent: Portland clinker in the form of grains having a Dv97 varying between 10 and 30 μm or having a Blaine specific surface area greater than or equal to 5300 cm 2 /g, preferably greater than or equal to 5500 cm 2 /g, the minimum quantity of said clinker by weight percent being determined using formula (I) for a clinker having a Dv97 varying between 10 and 30 μm or using formula (II) for a clinker having a Blaine specific surface area greater than or equal to 5300 cm 2 /g, i.e. [26 x ln(Dv97 k )] - 43 (Formula (I)), wherein Dv97 k is the Dv97 of the clinker expressed in μm, and [-6.10 -3 X SSB k ] + 75 (Formula (II)), wherein SSB k is the Blaine specific surface area of the clinker expressed in cm 2 /g; - slag, the minimum quantity of said slag by weight percent being determined using formula (III) in the case of a mix with a clinker having a Dv97 varying between 10 and 30 μm or using formula (IV) in the case of a mix with a clinker having a Blaine specific surface area greater than or equal to 5300 cm 2 /g, i.e. [1000 ÷ SSB L ] x [(-90 x ln(Dv97 k )) + 310] (Formula (III)), wherein Dv97 k is the Dv97 of the clinker expressed in μm and SSB L is the Blaine specific surface area of the slag expressed in cm 2 /g, and [1000 + SSB L ] x [(0.021 x SSB k ) - 103] (Formula (IV)), wherein SSB k and SSB L are respectively the Blaine specific surface area of the clinker and the slag expressed in cm 2 /g; the total clinker quantity in the binder pre-mix being strictly lower than 60 %. The invention also relates to a dry binder pre-mix obtained by mixing said dry binder pre-mix with aggregates, as well as to a wet concrete obtained by means of mixing with water.