different kinds of test specimens were used for
the testing [7]. Regards to the sand-water blasted
surface treated concrete specimens, the one with
primer coating resulted in a pull off strength of 3.7
MPa, where the other specimen without the primer
coating resulted in 5.7 MPa [7]. In addition, with
the wire brushing surface treated concrete specimen,
4.6 MPa pull off strength was observed with the
primer coated specimen and 4.8 MPa pull off
strength in absence of the primer coating [7].