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

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NMDOT Section 509 sets a higher minimum air content for concrete in high freeze-thaw risk zones than in low-risk zones. Entrained air is provided mainly to:

Increase unit weight so the structure is heavier Give the paste freeze-thaw resistance by providing microscopic bubbles that relieve ice pressure Replace coarse aggregate in the mix Make slump testing unnecessary

Correct Answer:

Give the paste freeze-thaw resistance by providing microscopic bubbles that relieve ice pressure

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