A FUNDAMENTAL STUDY ON DIAGNOSIS PERFORMANCE OF
HAMMERING TEST USING FE ACOUSTICS ANALYSIS
35th Our World in Concrete and Structures (OWICs) - 2010
Y Sonoda*, Kyushu University, Japan
K Kawabata, Kyushu University, Japan
Defect diagnostics, Rotary hammering test
Recently, the number of deteriorated RC structures is increasing in Japan. Thus it
is concerned about the possibility of their unexpected accident. For this reason,
many researches with respect to nondestructive test have been conducted. It is
pointed out that most of nondestructive tests have problems related to the cost or
measurement condition, therefore visual inspection or hammering tests is usually
applied in the actual field site. As one of the most useful monitoring test, hammering
test has been widely used for many years. However, their work is not always efficient.
From these backgrounds, the rotary hammering test has been developed by way of
improving these problems of the conventional hammering test. In this method,
hammering power is not varied by individual difference and it could examine wide
area in a short time. Consequently, the rotary hammering test is regarded as
portable and effective health monitoring tool for existing RC structures.
In general, theoretical underpinning of hammering test has not been presented
and the assessment technique of the rotary hammering test is not also provided
because of the lack of theoretical research. This study appraises the capabilities of
conventional hammering test and the rotary hammering test by means of the experiment with mortar specimens. Moreover, acoustic analysis based on finite element method is conducted in order to understand the influence of defect on the impact sound.