Concrete composition for overlay method and hardened product...

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 28/04 (2006.01) C04B 22/06 (2006.01) C04B 22/14 (2006.01) C04B 24/02 (2006.01) C04B 24/32 (2006.01) C04B 28/02 (2006.01) E01C 7/14 (2006.01)

Patent

CA 2295058

A concrete composition for use in an overlay method for improving a deteriorated pavement surface and/or layer which comprises a cement, a shrinkage-reducing agent, an expanding agent, a high performance AE water- reducing agent and AE agent, wherein the cement is a normal portland cement and/or a low heat portland cement. The use of the concrete composition affords a satisfactorily tight binding between an existing pavement layer and a new surface layer and prevents the two layers from separating. A new layer comprised of the composition has a reduced tendency to craze or to be weared.

L'invention concerne une composition de béton utile dans un procédé de recouvrement, qui sert à améliorer une surface et/ou une couche de chaussée détériorée. La composition renferme un ciment, un agent réducteur de retrait, un agent d'expansion, un agent réducteur d'eau AE et un agent AE haute performance. Le ciment est un ciment Portland normal et/ou un ciment Portland à faible dégagement de chaleur. L'utilisation de la composition de béton permet d'obtenir une liaison étroite satisfaisante entre une couche de chaussée existante et une nouvelle couche de surface, et de prévenir une séparation des deux couches. Une nouvelle couche constituée de la composition présente une tendance réduite aux craquelures et à l'usure.

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