Abstract:
The present invention relates to a process to improve the mechanical strength 28 days after mixing of a hydraulic composition submitted to a thermal treatment, the hydraulic composition comprising a hydraulic binder and optionally a mineral addition, wherein the process comprises the addition of a calcium salt and an optimized quantity of sulphate to the hydraulic composition.
Abstract:
The present invention relates to ahydraulic binder comprising a Portland clinker having a Blaine specific surface of 4000 to 5500 cm²/g, from 2.5 to 8 % of sulphate expressed by mass of SO 3 relative to the mass of clinker, from 1.5 to 10 % of calcium nitrite and/or calcium nitrate expressed as anhydrous mass relative to the mass of clinker and from 15 to 50 % of a mineral addition comprising calcium carbonate by mass relative to the total mass of binder.
Abstract:
L'invention concerne un liant hydraulique à base de ciment au laitier, le ciment au laitier comprenant 20 à 80 % en poids par rapport à un poids total de ciment au laitier, d'un laitier ou d'un mélange de laitiers de haut fourneau, par rapport au poids total du ciment au laitier et caractérisé en ce qu'il comprend au moins un additif d'accélération qui est un système ternaire constitué : - d'au moins un hydroxyde de métal alcalin en une quantité telle que, lors du gâchage dans l'eau du liant hydraulique, la concentration molaire en hydroxyde de métal alcalin dans l'eau est de 0,05 N à 0,60N, de préférence de 0,20N à 0,40N ; - d'au moins un sulfate de métal alcalin présent à raison de 0,2 à 3 % en poids du ciment au laitier ; et - d'au moins une source de sulfate de calcium en proportion telle que la teneur en sulfate de calcium (CaSO 4 ), par rapport au poids de ciment au laitier, est de 2 à 7 %.
Abstract:
The invention relates to a slag-cement-based hydraulic binder, in which the slag cement contains between 20 and 80 wt.- % of a blast furnace slag or a mixture of same in relation to the total weight of the slag cement. The inventive binder is characterised in that it contains at least one accelerating additive which is a ternary system comprising: at least one alkaline metal hydroxide at a concentration such that, during the mixing of the hydraulic binder in water, the molar concentration of alkaline metal hydroxide in water is between 0.05 N and 0.6 N and, preferably, between 0.2 N and 0.4 N; - between 0.2 and 3 wt.- % of at least one alkaline metal sulphate in relation to the slag cement; and at least one calcium sulphate source at a concentration such that the calcium sulphate (CaSO 4 ) represents between 2 and 7 % of the weight of the slag cement.
Abstract:
The invention relates to a slag-cement-based hydraulic binder, in which the slag cement contains between 20 and 80 wt.- % of a blast furnace slag or a mixture of same in relation to the total weight of the slag cement. The inventive binder is characterised in that it contains at least one accelerating additive which is a ternary system comprising: at least one alkaline metal hydroxide at a concentration such that, during the mixing of the hydraulic binder in water, the molar concentration of alkaline metal hydroxide in water is between 0.05 N and 0.6 N and, preferably, between 0.2 N and 0.4 N; - between 0.2 and 3 wt.- % of at least one alkaline metal sulphate in relation to the slag cement; and at least one calcium sulphate source at a concentration such that the calcium sulphate (CaSO4) represents between 2 and 7 % of the weight of the slag cement.
Abstract:
A hydraulic binder includes a Portland clinker having a Blaine specific surface of 4000 to 5500 cm2/g, from 2.5 to 8% of sulphate expressed by mass of SO3 relative to the mass of clinker, from 1.5 to 10% of calcium nitrite and/or calcium nitrate expressed as anhydrous mass relative to the mass of clinker and from 15 to 50% of a mineral addition including calcium carbonate by mass relative to the total mass of binder.
Abstract:
The present invention relates to a process to improve the mechanical strength 28 days after mixing of a hydraulic composition submitted to a thermal treatment, the hydraulic composition comprising a hydraulic binder and optionally a mineral addition, wherein the process comprises the addition of a calcium salt and an optimized quantity of sulphate to the hydraulic composition.