PERMEABILITY OF THE CEMENT-AGGREGATE INTERFACE: INFLUENCE OF THE TYPE OF CEMENT, WATER/CEMENT RATIO AND SUPERPLASTICIZER . ADMIXTURES FOR CONCRETE: IMPROVEMENT OF PROPERTIES. PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM HELD BY RILEM (THE INTERNATIONAL UNION OF TESTING AND RESEARCH LABORATORIES FOR MATERIALS AND STRUCTURES), BARCELONA, MAY 14-17, 1990

Air permeability and porosity of portland and pozzolanic cement pastes, prepared with w/c ratios of 0.32 and 0.40 and with or without superplasticizer, were determined. Permeability measurements have also been taken in parallel on disks consisting of a ring made up of the same paste and cast around a limestone core. The comparison between the permeability of pastes as received and the permeability of composites emphasized the interface area's contribution to this characteristic. The interface permeability is reduced as the w/c ratio decreases. The results have shown that, the w/c ratio being equal, the permeability of the interface is markedly higher than that of the pure paste in the first 7 days of curing but then the differences diminish. The addition of superplasticizer, the w/c ratio being equal, has little effect on the permeability of the portland and pozzolanic cement pastes even though it slightly increases porosity. However, the superplasticizer highly reduces the interface permeability not only when it is used as water reducer but also as fluidifier owing to the increased workability of the cement paste, which favours its adhesiveness to the aggregate surfaces. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0412374102
• Corporate Authors:

  Chapman and Hall Limited

  11 New Fetter Lane
  London,   England 
• Authors:
  • Costa, U
  • Facoetti, M
  • Massazza, F
• Publication Date: 1990

Language

• English

Media Info

• Features: References;
• Pagination: p. 392-401
• Serial:
  • Publication of: Chapman and Hall
  • Publisher: Chapman and Hall Limited

Subject/Index Terms

• TRT Terms: Admixtures; Aggregates; Concrete; Conferences; Permeability; Physical properties; Portland cement; Pozzolan; Superplasticizers; Water cement ratio
• Uncontrolled Terms: Concrete properties
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00612215
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• ISBN: 0-412-37410-2
• Files: ITRD, TRIS
• Created Date: Aug 31 1991 12:00AM