If the bond strength of SFRM on steel is 500 psf, what must the average bond strength of SFRM on the primer meet?

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Multiple Choice

If the bond strength of SFRM on steel is 500 psf, what must the average bond strength of SFRM on the primer meet?

The test is checking the required relationship between bond to steel and bond to the primer. In SFRM systems, the average bond strength on the primer must reach at least a specific percentage of the bond strength to the steel so that the primer–SFRM bond isn’t the weak link. That percentage is 80%. So, with steel bond strength at 500 psf, the primer bond must be at least 0.8 × 500 = 400 psf. Therefore, the minimum average bond strength on the primer is 400 psf. The other values are either too low or unnecessarily high relative to this requirement.

The test is checking the required relationship between bond to steel and bond to the primer. In SFRM systems, the average bond strength on the primer must reach at least a specific percentage of the bond strength to the steel so that the primer–SFRM bond isn’t the weak link. That percentage is 80%. So, with steel bond strength at 500 psf, the primer bond must be at least 0.8 × 500 = 400 psf. Therefore, the minimum average bond strength on the primer is 400 psf. The other values are either too low or unnecessarily high relative to this requirement.

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