NM CID GF-4 Practice Questions - New Mexico CID GF-4 Drainage Or Flood Control Systems Contractor Examination Exam

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Acceptance cylinders for structural drainage concrete are molded and field-cured initially per ASTM C31 and broken per ASTM C39. The standard specified compressive-strength age is:
Correct Answer:
28 days, unless the contract specifies another age such as 7 days for information or high-early mixes

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