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http://dx.doi.org/10.5345/JKIC.2011.06.3.229

Development of Post-installable Pullout Bolts and a Loading Device for Evaluating Concrete Strength  

Ko, Hune-Bum (Department of Architecture, Inha Technical College)
Lee, Ghang (Department of Architectural Engineering, Yonsei University)
Won, Jong-Sung (Department of Architectural Engineering, Yonsei University)
Publication Information
Journal of the Korea Institute of Building Construction / v.11, no.3, 2011 , pp. 229-237 More about this Journal
Abstract
The pullout test is a nondestructive testing method certified by the American Society for Testing and Materials (ASTM) and British Standards (BS). Research has shown that it is very reliable in terms of evaluating the concrete strength of reinforced concrete members. However, the pullout test is rarely performed on domestic construction sites due to the complex procedures and high costs involved. This study proposes a new pullout test composed of a post installable break-off bolt, an insert nut, and a pullout tester, which satisfy both economical and practical purposes on a construction site. Three different types of special fastening methods, a temporary fixed bolt, a plastic fixed panel, and a fixed bar, have been developed. A pullout tester is proposed that is driven by the circle force introduced into a handle composed of eight gears without a load cell and a hydraulic cylinder. The serviceability and reliability of these instruments were investigated through experiments at construction sites. Furthermore, the sample pullout test with a wall specimen was conducted to estimate the usefulness of the temporary fixed bolt type of fastening methods and pullout devices. Eventually, the developed instruments will be useful on construction sites if minor requirements are met.
Keywords
pullout tester; post-installable break-off bolt; installable pullout insert nut; building construction;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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