Welcome to ROSA P | The Chace air indicator. - 19795 | US Transportation Collection
Stacks Logo
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.
 
 
Help
Clear All Simple Search
Advanced Search
The Chace air indicator.
  • Published Date:
    1981
  • Language:
    English
Filetype[PDF-2.83 MB]


Details:
  • Publication/ Report Number:
    VHTRC 81-R37
  • Resource Type:
  • Geographical Coverage:
  • OCLC Number:
    71230468
  • Format:
  • Abstract:
    The study reported here has revealed very poor agreement between air contents determined by the Chace air indicator (CAI) and those by the pressure method. In tests of highway concretes the pressure method gave values typically 30% higher than anticipated based on the CAI readings, which could result in the production of concrete with lower than anticipated strengths. The poor agreement was found to involve relationships between the volumes of the stems, the volume of the bowls, and the mortar correction factors supplied by the manufacturers of the CAI. Consequently, it is recommended that AASHTO Specification T199-72 be modified to account for these relationships. It is concluded that the CAI can be used to provide a reasonably accurate indication of the air content of fresh concrete, when the results are based on the average of tests on a minimum of two samples and the results are corrected using a Chace conversion nomograph that takes into account the Chace factor (the volume of one graduation on the stem as a percentage of the volume of the bowl), the mortar content of the concrete, and the tendency of the CAI to provide a low result at high air contents.

  • Main Document Checksum:
  • Supporting Files:
    No Additional Files
No Related Documents.
You May Also Like:
Submit Feedback >