PURPOSE: To detect a possible defect due to the generation of a microscopic crack, by applying an acoustic emission detecting method to a lightweight aerated concrete being cured with an autoclave to monitor.
CONSTITUTION: Brittle material S to be inspected is arranged in a container 2 supported with a base 1. The container 2 has a heater 3, which is connected to a controller 12 and a recorder 11 and further to a thermocouple 4 to heat and control the inside of the container 2 to a required temperature. In addition, a waveguide rod 5 is provided piercing the wall of the container 2 and the tip thereof is stuck into a lightweight aerated concrete material S while the other end thereof is mounted on an acoustic emission transducer 6 outside the container 2. An acoustic emission signal in the material S is inputted into a personal computer 9 and a data recorder 10 via an amplifier 7. In this manner, the material S in the container 2 is cured adequately under the required curing conditions and a microscopic crack can be observed as generated during the curing.
OBA MICHIO
TERAMURA TOSHIFUMI
ONODA ALC KK
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