Micro-encapsulated crack resistant cement

US6565644B2 · kind B2 · utility

Assignee

• The United States of America, as represented by The Secretary of The Interior · US

Inventors

• William F. Kepler · Golden, US
• Kurt F. von Fay · Morrison, US

Key dates

• Filing date: Jun 27, 2001
• Grant date: May 20, 2003
• Expiry date: Jun 30, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2111/34
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A cement mixture is provided for preventing or reducing the formation of micro-cracks during hydration. The cement mixture includes both a conventional cement and a cement micro-encapsulated in a time-release polymer coating. The micro-encapsulated cement does not hydrate until a few hours to a few days after the bulk of the conventional cement has hydrated, thereby allowing for autogenous healing of small cracks.