Method for measuring ae in concrete structure

Abstract

Abstract PURPOSE:To locate a generation source, by a method wherein a long hole is bored through a concrete structure to be sealed with a liquid such as water and an AE sensor is arranged in said hole to measure the arrival time of minute breaking sound generated in the structure. CONSTITUTION:For example, a long hole 2 is bored through a concrete structure 1 such as a beam over the longitudinal direction thereof by a rock driller. A liquid 3 such a water is injected in the long hole 2 and plug bodies 4, 4 are mounted to both sides of said hole 2 to seal the liquid 3 in the long hole 3. AE sensors 5 each comprising an AE converter such as a piezoelectric element are arranged to both end parts of the long hole 2 and connected to a computer through an amplifier and a time difference measuring device. When stress acts on the structure to generate a crack C, the minute breaking sound of concrete generated at this time is received by the sensors 5 at both ends of the long hole 2 and the position of the crack can be located on the basis of the difference between times required until said sound arrives at the sensor 5.

Inventors

• 👤 Toshihiko Yamamoto
• 👤 俊彦 山本
• 👤 Tokuhisa Ooka
• 👤 督尚 大岡

Bibliographic Details