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http://dx.doi.org/10.5345/JKIBC.2018.18.1.017

The Relation between Pullout Load and Compressive Strength of Ultra-High-Strength Concrete  

Ko, Hune-Beom (Department of Architecture, Inha Technical College)
Kim, Ki-Tae (Department of Architectural Engineering, Inha University)
Publication Information
Journal of the Korea Institute of Building Construction / v.18, no.1, 2018 , pp. 17-24 More about this Journal
Abstract
The pullout test, a nondestructive testing(NDT), for pre-installed inserts is perhaps the most widely used technique to estimate the in-situ compressive strength of concrete. It measures the force needed to pullout a standardized metal insert embedded into concrete members. The pullout test was certified by the American Society for Testing and Materials(ASTM) and Canadian Standards Association(CSA) as a reliable method for determining the strength of concrete in concrete structures under construction. To easily estimate the strength of ultra-high-strength concrete, a simplified pullout tester, primarily composed of a standard 12mm bolt with a groove on the shaft as a break-off bolt, an insert nut, and a hydraulic oil pump without a load cell, was proposed. Four wall and two slab specimens were tested for two levels of concrete strength, 80MPa and 100MPa, using a simplified pullout tester with a load cell to verify the advantages of the pullout test and simplified pullout test. The compressive strength of concrete, pullout load, and the rupture of the break-off bolt were measured 11 times, day 1 to 7, 14, 21, 28, and 90. The correlation of the pullout load and the compressive strength of each specimen show a higher degree of reliability. Therefore, a simplified pullout test can be used to evaluate the in-place strength of ultra-high-strength concrete in structures. The prediction equation for the groove diameter of the break-off bolt(y) with the concrete strength(x) was proposed as y=0.0184x+5.4. The results described in this research confirm the simplified pullout's utility and potential for low cost, simplicity, and convenience.
Keywords
break-off bolt; nondestructive test; pullout load; simplified pullout test; ultra-high-strength concrete;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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