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Comparison of spacing factors as measured by the air-void analyzer and ASTM C457 [Final Report]

File Language:
English


Details

  • Creators:
  • Corporate Creators:
    Kansas. Dept. of Transportation. Bureau of Research
  • Corporate Contributors:
    United States. Federal Highway Administration
  • Subject/TRT Terms:
  • Publication/ Report Number:
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Kansas
  • Corporate Publisher:
    Kansas. Dept. of Transportation. Bureau of Research
  • Abstract:
    The Kansas Department of Transportation (KDOT) began using the Air-Void Analyzer (AVA) in

    2001 and first incorporated an AVA spacing factor requirement into paving specifications beginning in late

    2002. In 2005, a statewide investigation to evaluate the AVA and specifications began with the collection of

    4-inch diameter hardened concrete samples taken at or near locations where the spacing factor was

    determined with the AVA. The hardened concrete samples were tested to determine the spacing factor in

    accordance with ASTM C457 (2012), a well-established test method used to determine spacing factors in

    hardened concrete. A total of 270 data pairs were collected to evaluate KDOT’s current use of the AVA and

    ASTM C457 tests and to determine if a correlation (either direct or pass-fail criteria) exists between spacing

    factors obtained with the two methods. Results of the study indicate that average spacing factors obtained

    with the AVA were 1.67 higher than average spacing factors determined using ASTM C457. A strong direct

    correlation was not identified between the two test methods, although pass-fail criterion that limits KDOT’s

    risk of accepting concrete with an inadequate air-void system was identified.

  • Format:
    PDF
  • Collection(s):
  • Main Document Checksum:
    urn:sha256:59587796e76feecee87c7e529a02125fd585b5db11ae76585cdb4511e3b832ce
  • Download URL:
  • File Type:
    Filetype[PDF - 1.33 MB ]
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