Abstract: The use of calcium aluminate cement in autoclaved cement products, cementitious compositions suitable for forming the autoclaved cement products, and methods for making the cementitious compositions and autoclaved cement products.

Abstract: A ready-for-use dual-component system includes a portion (A) containing retarded aqueous-phase aluminous cement and an aqueous phase portion (B) for initiating the curing process. The portion (A) further includes boric acid or a salt thereof, at least one super-plasticizer and water. The portion (B) includes an initiator and water. The dual-component system meets the following requirements: a) the initiator includes uniquely lithium salts and contains a mixture of lithium hydroxide and at least another water-soluble lithium salt; the total mass of lithium in the portion (B) is such that, after mixing with the portion (A), ranges from 0.5 wt % to 2 wt % relative to the weight of aluminous cement in the portion (A); and c) the mass of lithium in the portion (B) added by the lithium hydroxide is such that, after mixing with the portion (A), ranges from 0.1 wt % to 1 wt % relative to the weight of aluminous cement in the portion (A).

Abstract: The present invention relates to a method for recording a graphic data stream including a succession of computer images. The method includes a first step for recording the first image of the graphic data stream for each image of the graphic data stream. A second step divides a current image into blocks of pixels. A third step compares block of pixels by block of pixels, the current image and the previous image in order to obtain a set of blocks of pixels of the current image having one or more differences from the corresponding blocks of pixels of the previous image. A fourth step combines the blocks of pixels, obtained in the third step, into several sets of blocks of pixels according to a criterion of proximity. A fifth step records in a file the sets of blocks of pixels originating from the fourth combining step.

Abstract: The invention relates to a setting accelerator for a composition comprising Portland cement, in the form of a slurry comprising at least one calcium aluminate, 0.5 4%, preferably 0.6 2.3% of an aluminous cement setting inhibitor by weight in relation to the overall weight of the calcium alumnate, and an anti-sedimentation agent.

Abstract: The invention relates to a setting accelerator for a composition comprising Portland cement, in the form of a slurry comprising at least one calcium aluminate, 0.5 4%, preferably 0.6 2.3% of an aluminous cement setting inhibitor by weight in relation to the overall weight of the calcium alumnate, and an anti-sedimentation agent.

Abstract: The invention concerns a method which consists in mixing the mortar and a setting and hardening accelerator in a screw conveyor (13) and in pouring into the cavity (8) by gravity the resulting mixture through a chute (14, 28, 30).