W. R. Grace Co.-conn.

Durga V Subramanian

Neal Steven Berke

Lawrence L Kuo

Felek Jachimowicz

Leslie A Jardine

Lawrence R Roberts

Paul J Sandberg

Josephine H Cheung

Antonio J Aldykiewicz

Charles R Cornman

Vijay Gupta

John L Gallagher

Urszula B Latosiewicz

Method for suppressing antagonistic hydration reactions in Portland fly ash cement involves the use of unponded fly ash that is pre-hydrated, preferably as an aqueous slurry wherein fly ash, preferably having an alkaline earth metal oxide of at least 10% by weight, is soaked, whereby the hydration reaction of the resultant mixed fly ash and cement is accelerated when these components are mixed together with water to hydrate the cement. Blended Portland cement/fly ash compositions of the invention will also have higher early strength as well as shorter set time compared to untreated blends.

Suppression of antagonistic hydration reactions in blended cements

Methods and compositions involving the use of nitrogen-containing coordinated metal compounds for stabilizing chromium VI reducing metal cations. Exemplary uses include processes for making cement, and exemplary compositions include cement additives, concrete admixtures, as well as hydratable cement and cementitous compositions.

Coordinated metal compounds for reducing chromium

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Lexington, MA, United States of America

Durga V Subramanian