Ultrafine cement-based grouts are being used more often on tunneling and underground projects in the U.S. because they provide good groundwater control and improvement in conditions where other grouts, made with ordinary portland cement, Type III cement or chemical cement, are not practical. Ultrafine is considerably more expensive, but it has key advantages, including a reduced need for overall cement use, improved groutability and reducing delays by mitigating potential problems quickly. This article explains ultrafine cement's basic properties and gives examples of successful utilization. It was originally developed in Japan for improved permeation into fine- grained sands. The particles are significantly smaller, almost one- tenth as small. They cost more because they are produced in limited volume and require more processing. The typical sack is only 44 or 55 pounds, and the cost is typically five to 15 times higher than ordinary portland cement grouts. But they require significantly lower cement to water ratios, need less time for injection and cut excavation costs and times. The article includes charts and references showing different performance capabilities.

  • Availability:
  • Corporate Authors:

    Polygon Media Limited

    Tubs Hill House, London Road
    Sevenoaks, Kent TN13 1BY,   United Kingdom 
  • Authors:
    • Henn, R H
    • Davenport, J C
  • Publication Date: 2005-4


  • English

Media Info

  • Features: Figures; Photos; References;
  • Pagination: p. 27-29
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01001672
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Files: BTRIS, TRIS
  • Created Date: Jul 7 2005 12:00AM