The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 27, 2013
Filed:
Oct. 30, 2009
Denise A. Silva, Arlington, MA (US);
Josephine Cheung, Lexington, MA (US);
Paul Sandberg, Beverly, MA (US);
Lawrence Roberts, Acton, MA (US);
Durga V. Subramanian, Lexington, MA (US);
John L. Gallagher, Bollingham, MA (US);
Lawrence L. Kuo, Acton, MA (US);
Denise A. Silva, Arlington, MA (US);
Josephine Cheung, Lexington, MA (US);
Paul Sandberg, Beverly, MA (US);
Lawrence Roberts, Acton, MA (US);
Durga V. Subramanian, Lexington, MA (US);
John L. Gallagher, Bollingham, MA (US);
Lawrence L. Kuo, Acton, MA (US);
W. R. Grace & Co.-Conn., Columbia, MD (US);
Abstract
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.