The 7-day test results from the cylinder break for a major concrete placement indicate that the concrete strength is below the minimum psi specified at 7 days. What should the CM do? 

a) Immediately stop the work, and bring in the president of the company to discuss their lack of quality control 

b) Notify the contractor that he must immediately demolish the defective, non-compliant concrete and replace it at his expense 

c) Reference the test results in daily reports and wait to receive the 14, 28, and 56 day break results, if necessary; closely monitor design mixes and delivery tickets for compliance with specified strength for the next placements 

d) Review the concrete mix design

Answer rating: 100% (QA)

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