THE PULL-OFF TEST FOR CONCRETE PATCH REPAIRS

Repair to concrete structures often involves breaking out cracked conc rete and replacing this and areas of spalling with a mortar or concret e. Adhesion of the new patch to the original concrete is generally con sidered to be an important criterion in judging the success of the rep air, In recent years, the pull-off test method has gained favour as an in situ method of assessing the tensile adhesion strength, On the bas is of an extensive programme of tests, this paper outlines the factors which affect the test and describes an appropriate scheme for accepta nce testing of patch repairs.