Experimental investigation of shear bond strength between steel and self-compacting concrete

In this article the shear bond strength between steel and self-compacting concrete (SCC) without mechanical shear connectors is evaluated by means of push-out tests. The test members differ by steel surface texture, adhesive properties, and SCC mixture. Both smooth and sandblasted steel plates are used and test members are cast with fresh epoxy or hardened epoxy, gritted with granulates. The influence of steel fibre reinforcement on the bond strength is also examined. The ultimate shear bond stresses are recorded as well as the slip between steel and concrete. Also the theoretical distribution of the shear bond stress between steel and concrete is examined by means of a finite element analysis (FEA). Test members fail either by steel plate - adhesive failure, by concrete - adhesive failure, or by shear failure of the concrete sample. Test results point out nominal shear bond stresses between 0.37 and 2.25 N/mm2. However, the values are widely scattered and therefore it's difficult to make definite conclusions about the influence of the studied parameters. According to the FEA of the specimens used in this test program, a non-uniform stress distribution between steel and concrete is found and the maximum shear bond stress is 2.98 times higher tan the nominal shear stress.

ISBN:9789814324045

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