Pull Off Test on Render and Other Overlying Materials on Concrete

The purpose of the test is to measure the maximum tensile strength of the render and other overlying materials on concrete. The test sample is subjected to increasing tensile stress until failure occurs. The weakest path could be along an interface between two layers or a cohesive facture within one layer or a combination of these.

General Test Procedures

1. Prepare a 50mm diameter sample by coring on the area tested.

2. Apply a continuous pulling force onto the sample until failure occurs.

3. Record and calculate the adhesion strength.

4. Inspect the failure mode of the fractured sample.

Test Frequency

Acceptance Limit

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Last modified: December 15, 2004