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The relative increase in slant-shear strength for wire brushed and drilled holes surface preparations.
| Ageing | Bonding Strength Increment | |
|---|---|---|
| Wire Brushed | Drill Holes | |
| Test results at 1 day | 3% | 5.7% |
| Test results at 14 days | 1.5% | 4.7% |
| Test results at 28 days | 2.9% | 7.0% |
| Test results at 60 days | 2.6% | 4.7% |
| Average | 2.5% | 5.5% |
