Patents by Inventor Sandra Boivin

Sandra Boivin has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • CONCRETE COMPOSITION WITH REDUCED SHRINKAGE
    Publication number: 20090305019
    Abstract: A concrete composition includes: a hydraulic binder component which includes cement, particulate materials having a size of less than 200 ?m, and an expansive agent; granular materials having a size (D50) greater than 200 ?m; a shrinkage reducing agent; a superplasticizer; and water; wherein the water to hydraulic binder ratio is from 0.1 to 0.5 by weight, the shrinkage reducing agent is present at 0.1 to 1.0% by weight of binder, and the particulate materials are present in a concentration of from 10 to 80% by total weight of binder.
    Type: Application
    Filed: September 19, 2007
    Publication date: December 10, 2009
    Applicant: Lafarge
    Inventors: Gilles Chanvillard, Sandra Boivin, Jean-Philippe Thierry, Frederic Guimbal, Denis Garcia
  • Concrete comprising organic fibres dispersed in a cement matrix, concrete cement matrix and premixes
    Patent number: 6723162
    Abstract: A concrete includes organic fibers, dispersed in a cement matrix. The cement matrix includes elements having predetermined particle sizes. The organic fibers have predetermined lengths and diameters. The behavior of the concrete is improved both with respect to the occurrence of minute cracks and the propagation of large cracks as a result of a synergistic effect between the cement matrix and the organic fibers.
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: April 20, 2004
    Assignees: Bouygues, Lafarge, Rhodia Chimie
    Inventors: Marcel Cheyrezy, Jerome Dugat, Sandra Boivin, Gilles Orange, Laurent Froin