Evaluation of two automated methods for determination of the air void system parameters of hardened concrete.
Published: 2006
Language: eng
Number of pages: 96
ISBN-13: 9780494210529
Description: Determination of air void parameters of hardened concrete is usually performed according to ASTM C 457 standard. This standard process is tedious and the results depend on the skill of the operator. Several researchers have proposed alternative automated methods for performing the test. Two of these new methods are Rapid Air 457 and the scanner method. Rapid Air 457 collects images from the surface of concrete samples using a digital microscope whereas in the scanner method, the surface is scanned by a flat-bed scanner. Then, the captured images are analyzed by different computer software. In this thesis, 22 concrete samples were examined by these two methods and the air void parameters were compared to those obtained from the standard method. Moreover, different parameters influencing the results of the test were examined and the precision of the results were compared to the recommendations of ASTM standard.
Notes: Advisor: Douglas Hooton.

Source: Masters Abstracts International, Volume: 45-03, page: 1581.

Thesis (M.A.Sc.)--University of Toronto, 2006.

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