FACTORS DETERMINING CHARACTERISTICS AND COMPOSITION OF VACUUM DEWATERED CONCRETE

Variations in porosity, composition and strength of vacuum dewatered concrete were investigated by laboratory testing and field experience. Top vacuum processing was applied. No replacement of solid particles, cement, and sand was noted during the vacuum treatment. Segregation occurs during placing and vibration and is pronounced for fluid mixes. Restrained dewatering and crusting are a consequence of segregation and are especially pronounced for fluid mixes with high cement content, containing clay impurities and air-entraining agents. Variations in water content and in pressure in the depth of slabs were compared. The pressure is diminished with distance from the treated surfaces and increases with processing time. Variations in composition before and during the vacuum affect the capillary structure of concrete.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/0889325X
• Corporate Authors:

  American Concrete Institute

  P.O. Box 19150, Redford Station, 22400 Seven Mile Road
  Detroit, MI  United States  48219
• Authors:
  • Malinowski, R
  • Wenander, W H
• Publication Date: 1975-3

Media Info

• Pagination: p. 98-101
• Serial:
  • American Concrete Institute, Journal of
  • Volume: 72
  • Issue Number: 3
  • Publisher: American Concrete Institute
  • ISSN: 0889-325X

Subject/Index Terms

• TRT Terms: Admixtures; Air entraining agents; Cement content; Concrete; Concrete placing; Dewatering; Pressure; Sand; Vacuum
• Uncontrolled Terms: Segregation
• Old TRIS Terms: Concrete composition; Vacuum concrete method; Vacuum dewatering
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00084701
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 2 1975 12:00AM