In a hypothetical scenario where the steel bond strength is 500 psf, what must the average primer bond strength meet?

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Multiple Choice

In a hypothetical scenario where the steel bond strength is 500 psf, what must the average primer bond strength meet?

The requirement is that primer bond strength must reach a level that’s a substantial fraction of the steel bond strength, typically 80% of it. This ensures the primer adheres well enough to transfer stress and prevent delamination before the steel or fireproofing fails. With steel bond strength at 500 psf, 80% of that is 400 psf. So the average primer bond strength must meet 400 psf. The other numbers correspond to 50%, 70%, and 90% of 500 psf and don’t meet the standard 0.8 factor.

The requirement is that primer bond strength must reach a level that’s a substantial fraction of the steel bond strength, typically 80% of it. This ensures the primer adheres well enough to transfer stress and prevent delamination before the steel or fireproofing fails. With steel bond strength at 500 psf, 80% of that is 400 psf. So the average primer bond strength must meet 400 psf. The other numbers correspond to 50%, 70%, and 90% of 500 psf and don’t meet the standard 0.8 factor.

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