Patents Assigned to Hazama-Gumi, Ltd.
  • Process for placing cement composition having high strength
    Patent number: 4585486
    Abstract: A process for placing a cement composition having high strength is provided. The process comprises the steps of adding a viscosity increasing agent, vacuum de-bubbling under reduced pressure and allowing the de-bubbled cement composition to be hardened. At the vacuum de-bubbling step, relatively large foams present in the cement composition are removed and only fine bubbles are left in the composition. The strength of the cement composition is remarkably improved by the removal of large bubbles.
    Type: Grant
    Filed: July 10, 1984
    Date of Patent: April 29, 1986
    Assignee: Hazama-Gumi, Ltd.
    Inventors: Keiichi Fujita, Hiroshi Nakauchi, Tatsuo Kita, Yoshiki Nakagawa, Terunobu Maeda