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

Air-entraining admixture is specified in exterior New Mexico walkways and driveways primarily to:

Increase slump without changing water content, as a substitute for a water reducer Provide a system of microscopic bubbles that relieves freeze-thaw pressure in the paste Color the concrete darker for faster spring thaw Replace the need for curing

Correct Answer:

Provide a system of microscopic bubbles that relieves freeze-thaw pressure in the paste

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