An Experimental Study on the Bond Split Mechanism of High Strength Concrete ;;
For the prediction of concrete-steel bond ability in reinforced concrete, many countries establish specifications for the pullout test. But these methods hardly to consider many parameters such as strength, shape, diameter and location of steel, concrete restrict condition by loading plate, strength of concrete and cover depth etc, and it is difficult to solve concentration and disturbance of stress. The purpose of this study is to propose a New Ring Test method which can be rational quantity evaluations of bond splitting mechanism. For this purpose, pullout test was carried out to assess the effect of several variables on bond splitting properties between reinforcing bar and concrete. Key variables are concrete compressive strength, concrete cover, bar diameter and rib spacing. Failure mode was examined and maximum bond stress-slip relationships were presented to show the effect of above variables. As the result, it appropriately expressed general characteristics of bond splitting mechanism, and it proved capability for standard test method.
bond split mechanism;high-strength concrete;New-Ring Test;
Standard Test Method for Comparing Concrete on the Basis the Bond Deveolped with Reinforcing Steel, 0000.
Bond Test for Reinforcing Steel 2, Pull-out Test, 0000.
Proceeding Symposium on Bond Crack Formation in Reinforced Concrete, 1957.
B.S. Code of Practice for Reinforced Concrete CP 114, 1972.
Building Code-Requirements of Reinforced Concrete, 1989.