Surface treated additive for portland cement concrete

Details Surface treated additive for portland cement concrete Surface treated additive for portland cement concrete

C - Chemistry, Metallurgy

04

B

C04B 40/06 (2006.01) C04B 20/10 (2006.01)

Patent

CA 2272408

The invention is directed at an additive for incorporation into a cementitious compound comprising Portland cement and water prior to the setting of the compound. The additive is comprised of a surface treated additive wherein the surfaces of the additive are treated with a substance which has a transient hydrophobic effect on the additive, which effect temporarily renders the additive more hydrophobic for a time period following the incorporation of the additive into the compound such that the water comprising the compound is less attracted to the additive during the placement of the compound and is thus available to provide workability to the compound, and such that the additive regains its natural properties following placement of the compound in order to permit the additive to participate with the compound during the curing of the compound. The invention is also directed at a process for preparing the additive and a process for preparing a cementitious compound comprised of the additive.

L'invention concerne un additif conçu pour être incorporé dans un béton au ciment contenant du ciment Portland et de l'eau, préalablement au durcissement de ce béton. Cet additif contient un additif traité en surface, les surfaces de cet additif étant traitées avec une substance exerçant un effet hydrophobe transitoire sur l'additif, ce qui le rend temporairement plus hydrophobe pendant une durée suivant son incorporation dans le béton, de sorte que l'eau contenue dans ce dernier est moins attirée par l'additif pendant la mise en place du béton et est, par conséquent, disponible pour conférer de l'ouvrabilité au béton et que l'additif récupère ses propriétés naturelles après la mise en place du béton, ce qui permet à cet additif d'être solidaire du béton pendant son durcissement. L'invention concerne également un procédé servant à préparer l'additif, ainsi qu'un procédé servant à préparer un béton au ciment contenant cet additif.

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