Title:
New Method and Apparatus for Testing Air
Content of Fresh Concrete In Situ
Author(s):
K. W. Nasser and R. Beaton
Publication:
Journal Proceedings
Volume:
77
Issue:
6
Appears on pages(s):
472-476
Keywords:
air-entrained concretes; air entrainment; air meters; fresh concretes;
measuring instruments; quality control; workability.
DOI:
10.14359/7022
Date:
11/1/1980
Abstract:
This paper describes a new apparatus to measure the air content of fresh concrete in situ. The apparatus is basically a hollow tube which is open at one end and contains an electric heater at its center. The tube is pushed down into the concrete and the heater turned on for about 30 sec. The rise in temperature expands the entrained air which, in turn, raises the pressure in the confined space. The air content of the fresh concrete seems to be a direct function of the rise in pressure.