Supported carbonic acid esters useful as set accelerators...

Details Supported carbonic acid esters useful as set accelerators... Supported carbonic acid esters useful as set accelerators...

C - Chemistry, Metallurgy

04

B

261/50

C04B 24/04 (2006.01) C04B 18/14 (2006.01) C04B 28/02 (2006.01) C04B 40/00 (2006.01)

Patent

CA 2336364

Cementitious compositions are prepared using a dry, flowable admixture containing an ester of carbonic acid such as propylene carbonate and a solid, particulate support which is non-reactive toward the ester such as silica fume. Such admixtures accelerate the set and increase the thixotropy of unhardened mixtures containing hydraulic cement and water, yet can be readily handled and stored in stable form until ready to be used.

L'invention concerne des compositions à base de ciment préparées avec un adjuvant sec, fluide contenant un ester d'acide carbonique tel que le carbonate de propylène et un support solide particulaire ne réagissant pas avec cet ester, par exemple des fumées de silice. De tels adjuvants accélèrent la prise et augmentent la thixotropie des mélanges non durcis contenant un ciment hydraulique et de l'eau, et sont néanmoins faciles à manipuler et peuvent être stockées sous une forme stable avant d'être utilisés.

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