Additifs pour ciment Portland consistant d'un agent reducteur dans une matrice polymérique

Portland cement additives consisting of a reducing agent embedded in a polymer matrix

Portlandzementzusatzmittel enthaltend in eine Polymermatrix eingeschlossene Reduktionsmittel

Abstract

A method is described for reducing hexavalent chromium in common cements and cement based materials comprising the addition, to said cements, of a suitable reducing agent embedded in a polymer matrix consisting of polyvinyl acetate (PVA), polyvinyl alcohol (PVOH), polyglycolic acid (PGA), polyglycolic acid/lactic acid copolymers (PGA/PLA), polyacrylic acid (PAA), maleic polyanhydride (PMA), acrylic or methacrylic acid/acrylic ester/styrene copolymers, acrylic or methacrylic acid/maleic anhydride copolymers, ethylene/maleic anhydride copolymers, polyester/maleic anhydride copolymers, ethylene oxide/polyethylene oxide copolymers.

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