Concrete has been purchased to specification ASTM C94. The concrete was loaded and began mixing in the truck at 1:30 p.m. The mixing drum revolution revolves at 2 revolutions per minute. The truck arrives at the job at 3:15 p.m. What is the correct reason for rejecting the load of concrete?

Concrete has been purchased to specification ASTM C94. The concrete was loaded and began mixing in the truck at 1:30 p.m. The mixing drum revolution revolves at 2 revolutions per minute. The truck arrives at the job at 3:15 p.m. What is the correct reason for rejecting the load of concrete?