Air Void Analyzer Evaluation
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Air Void Analyzer Evaluation

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Details:

  • Creators:
    Magura, Donald D.
  • Corporate Creators:
    United States. Federal Highway Administration. Office of Technology Applications
  • Corporate Contributors:
    Construction Technology Laboratories Inc. (Illinois)
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA-SA-96-062
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    United States
  • Corporate Publisher:
    United States. Federal Highway Administration. Office of Technology Applications
  • Abstract:
    The Air Void Analyzer (AVA) is a device that permits testing of a sample of fresh concrete and that obtains data regarding air void parameters of air content, specific surface, and spacing factor. Duration of the test is a maximum of 25 minutes. A computer records measured data and calculates the air void parameters. Results are available immediately after the test. The evaluation was conducted to obtain first-hand experience in the use of the device, to use the equipment with a variety of concrete mixes, and to obtain data for comparison of results obtained by the ASTM C457 modified point-count method on hardened concrete from the same batch. A total of 26 AVA tests were conducted on concrete at two laboratories and on concrete used in construction at two locations. Concrete from the same batches was also subjected to measurement of the air void system according to ASTM C457. From the tests the following observations can be made: the AVA did not indicate the same air content as an air pressure meter or as determined by ASTM C457 and the AVA air content was always on the order of 2% less than the air content by the pressure meter and by ASTM C457; the spacing factor was about the same by either the AVA or ASTM C457; and the specific surface calculated by the AVA was greater than that from the ASTM C457 test, i.e., the AVA indicated smaller air voids than indicated by the ASTM C457 procedure. The AVA has demonstrated that it can provide information that characterizes the air void system. Use of the AVA system may require some calibration to durable concrete. Nonetheless, if the AVA is used to measure air void parameters in trial batches or in production mixes and correlated to freeze-thaw tests or to known durable concrete mixes, the system can be applicable in quality control and assessment of concrete mixes.
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