THE USE OF THE FLOW LENGTH CONCEPT TO ASSESS THE EFFICIENCY OF AIR ENTRAINMENT WITH REGARDS TO FROST DURABILITY: PART I--DESCRIPTION OF THE TEST METHOD

A numerical procedure to determine the flow length and other characteristics of the air-void system in hardened concrete is described in this paper. Physically, the flow length represents the distance that water must travel through the cement paste to reach the perimeter of the closest air void. The expectation is that flow length will be a better indicator of the frost durability of concrete than the frequently used Recommended Practice for the Microscopical Determination of Air Void Content and Parameters of the Air Void System in Hardened Concrete (American Society for Testing and Materials [ASTM] C 457) spacing factor. By microscopically examining polished concrete sections, the flow length is determined. The determination can result from recording the size-distribution of the circles intercepted by the plane on a given surface area or from recording the size-distribution of the chords intercepted along a given line of traverse. The proposed procedure is demonstrated in a numerical example to illustrate its advantages. While similar to the Philleo factor, the flow length provides a more accurate estimation of the real distribution of air voids through the cement paste.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/3528769
• Corporate Authors:

  American Society for Testing and Materials (ASTM)

  100 Barr Harbor Drive, P.O. Box C700
  West Conshohocken, PA  United States  19428-2957
• Authors:
  • PLEAU, R
  • Pigeon, M
• Publication Date: 1996-6

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 19-29
• Serial:
  • Cement, Concrete and Aggregates
  • Volume: 18
  • Issue Number: 1
  • Publisher: American Society for Testing and Materials (ASTM)
  • ISSN: 0149-6123
  • Serial URL: http://journalsip.astm.org/JOURNALS/CEMENT/cca_home.html

Subject/Index Terms

• TRT Terms: Air entrainment; Concrete hardening; Flow; Freeze thaw durability; Length; Numerical analysis; Spacing; Streamflow; Water
• Uncontrolled Terms: Hardened concrete
• Old TRIS Terms: Air void system; Freezing thawing effects
• Subject Areas: Highways; Hydraulics and Hydrology; Materials; I32: Concrete;

Filing Info

• Accession Number: 00726968
• Record Type: Publication
• Files: TRIS
• Created Date: Oct 26 1996 12:00AM