NM CID GF-2 Practice Questions - New Mexico CID GF-2 Bridges Contractor Examination Exam

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Before placing backfill against a new NMDOT concrete structure, the Contractor must wait until the concrete has reached its specified design strength, or:

500 psi, regardless of specified strength 80 percent of specified compressive strength but not less than 2,500 psi, by the maturity method Any strength, provided 4 hours have elapsed 2,000 psi by a rebound hammer only, with no maturity calibration

Correct Answer:

80 percent of specified compressive strength but not less than 2,500 psi, by the maturity method

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