NM CID GS-4 Practice Questions - New Mexico CID GS-4 Concrete, Cement, Walkways And Driveways Examination Exam

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ACI 306 treats weather as cold-weather concreting when the air temperature is expected to fall below which value, and concrete shall not be placed on which subgrade?

Below 60°F; placement on frozen ground is acceptable if the mix is heated Below 40°F; concrete shall not be placed on a frozen subgrade Below 20°F only; no subgrade restriction Below 32°F only if snow is falling

Correct Answer:

Below 40°F; concrete shall not be placed on a frozen subgrade

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