| Title |
A Study on Compressive Strength Estimation of Underwater Concrete Structures According to Water Depths |
| Authors |
이지성(Lee, Jisung) ; 한상훈(Han, Sanghun) ; 박승희(Park, Seunghee) |
| DOI |
https://doi.org/10.12652/Ksce.2016.36.3.0341 |
| Keywords |
수중 콘크리트;비파괴검사;슈미트해머;초음파센서 Underwater concrete;Nondestructive test;Schmidt hammer;Ultrasonic sensor |
| Abstract |
Harbor facilities require long-term durability and safety, and also maintain the performance requirement until the durability life. However, existing harbor facilities are becoming superannuated with durable years and durability is declined by erosion of the sea and damage from sea. In addition, harbor facilities will be in demand for the expansion of harbor and offshore structures with rising economic power by enhancement of domestic industry and increase of import and export. Therefore, in this study, two kinds of nondestructive test (NDT) techniques (schmidt rebound hammer and ultrasonic sensor) are verified for the effective maintenance of underwater concrete structures including harbor facilities. Sea field applicability of Schmidt hammer and ultrasonic sensor was verified by comparing field test result with sea field test result and also deduced the compressive strength estimation equation by depth of the water. On the basis of the sea field test result, compressive strength estimation equation which was deduced by multiple regression analysis indicated highest accuracy compared to other equations, especially it will be more likely to be used in underwater because of the depth of water correction. In the future, if schmidt hammer and ultrasonic sensor which were invented as waterproofing are used with ROV (Remotely Operated Vehicle), it will be possible to make a diagnosis of high reliability for underwater concrete structures and set up a ubiquitous concept of NDT system. |