抄録
The standard microscopic technique for the characterization of air-voids in hardened concrete is a method according to ASTM C 457, but it is a time and effort consuming process, Recently, a technique using an image analyzing system has been developed for reducing the time and effort to measure. However, the specimens for the analyzing system have to be given surface treatment to distinguish the air-voids in cement paste matrix.
This paper describes a technique of the new automatic quantitative image analyzing system using a difference of intensity of illumination for the non-treatment surface specimens. The surface of the specimen has light coming from three directions for the stereo analysis. The time required is about one hour to measure the air-void system of a 10cm square specimen.
