ISSN: 0149-6123
Page Count: 7

The Precision of the Microscopical Determination of the Air-Void System in Hardened Concrete
Sommer, H
Head of institute, Austrian Cement Research Institute,

Abstract

Twenty laboratories from ten countries took part in an international comparative test to determine the air-void system of hardened concrete. The method of measurement did not seem to have a significant influence on results, but good grinding techniques and the magnifications were important. Further tests were performed at the Viennese Cement Research Institute with the aim of improving the precision of the results. It is recommended that the entrapped and the entrained air voids be counted separately and that the spacing factor be calculated from the entrained air voids only.

Keywords:
concrete, air entrainment, microscopy, grinding

Paper ID: CCA10403J
DOI: 10.1520/CCA10403J
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