Estimation of depth of concrete column members using impact echo method

2^nd International Conference and Exhibition on Materials Science & Engineering

October 07-09, 2013 Hampton Inn Tropicana, Las Vegas, NV, USA

Yongtaeg Lee

Accepted Abstracts: J Material Sci

Abstract :

Reinforced concrete structures get building aging and functional deterioration phenomena due to various complex factors as time passes. In order to maintain the existing concrete structures in a safe and usable state, an overall maintenance management is necessary regarding structure aging from quality management of new construction. Thus, non-destructive testing is needed to estimate the structure damage, defect, or proper construction without damaging the structure. In U.S., there is a standard for non-destructive test (ACI 228.2R-98), and also in Japan, the non-destructive test method and compressive strength estimation manual was prepared by the Architectural Institute of Japan in 1983, and there are active researches in the ground field, but it lacks verification in architecture field. Thus, in this study, a technique that can estimate the depth of concrete column member using the Impact Echo method which is one of the non-destructive test methods shall be reviewed and evaluated for applicability to the architecture field. The equipment used in testing is Freedom Date Pc Platform WinTFS 2.5.2 by company Olson of U.S., and the experiment involved leveling the top surface of the concrete member, installing the equipment and applying impact 9 times, and taking the average of the reverberation values obtained. The estimated average depth of concrete column member using Impact Echo method was 304mm for IEC-300, 398mm for IEC-400, and 484mm for IEC-500, and the relative error rate compared to the actual size was 1%~3%, showing that they were relatively in agreement. In this study, the estimation of concrete column member depth was executed using the Impact Echo method which is one of the non-destructive methods, and the error rate against the actual depth was found to be 1%~3% showing that they were relatively in agreement, and also the applicability in steel concrete structure could also be confirmed.

Biography :

ongtaeg Lee is a Professor at the Hanbat National University (Korea). He is member of the Architectural Institute of Korea (AIK), Korea Concrete Institute (KCI) and Korea Institute for Structural Maintenance Inspection (KSMI). His research interests include using nondestructive test, diagnosis condition of concrete structures.