Circular-groove test

Fig. 13-7. Circular-groove tests of weld metal cracking.

Bond strength between PC overlays and portland cement concrete substrate was measured using the pull-out test method [7], The tensile bond test is illustrated in Fig. 1. Specimens were thin overlays, about 1/2-in. (1.3-cm) thick, cast directly (without the use of a primer) on sandblasted portland cement concrete slabs. Circular grooves (4-in./10. 8-cm diameter) were cored through the overlays and into the portland cement concrete substrate. Circular steel disks... 

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