Process for preparing a filler for asphalt or concrete...

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 5/06 (2006.01) C04B 18/14 (2006.01) C04B 20/02 (2006.01) C04B 26/26 (2006.01) C04B 28/02 (2006.01)

Patent

CA 2687985

The present invention relates to a process for preparing, starting from a slag material, a filler for construction materials which contain bitumen or a hydraulic binding agent. The slag used to prepare the filler contains y- dicalcium silicate. The process comprises the step of removing from the slag material a finer fraction formed by particles of a size between 0 and at least 0.75 mm so as to reduce the .gamma.-dicalcium silicate content of the slag material; and the step of finely milling at least a portion of the remaining coarser fraction of the slag to obtain the filler. The invention also relates to the obtained filler, to the use thereof for preparing construction materials and to concrete or mortar compositions and asphalt compositions containing the filler. By removing the finer fraction from the slag material, a filler is obtained which has a considerably lower water content so that it becomes suitable for use in asphalt or concrete or mortar compositions, in particular in self-compacting concrete compositions.

L'invention concerne un procédé qui permet de préparer, à partir d'une matière de laitier, une charge destinée à des matériaux de construction contenant du bitume ou un agent de liaison hydraulique. Le laitier utilisé pour préparer la charge contient du silicate de .gamma.-dicalcium. Le procédé consiste à enlever de la matière de laitier une fraction plus fine formée de particules d'une taille comprise entre 0 et au moins 0,75 mm afin de réduire la teneur de la matière de laitier en silicate de .gamma.-dicalcium; et à broyer finement au moins une partie de la fraction plus grossière restante du laitier afin d'obtenir la charge. L'invention se rapporte également à la charge obtenue, à l'utilisation de cette dernière dans la préparation de matériaux de construction, et à des compositions de béton ou de mortier et des compositions d'asphalte contenant la charge précitée. En enlevant la fraction fine de la matière de charge, on obtient une charge possédant une teneur en eau considérablement réduite, qui la rend apte à être utilisée dans les compositions d'asphalte, de béton ou de mortier, en particulier dans les compositions de béton autoplaçant.

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