Michigan Residential Builders License Practice Test

How long should ready mixed concrete be discharged from the truck after mixing?

1. 1 hour

2. 1 1/2 hours

3. 2 hours

4. 2 1/2 hours

The correct answer is: 1 1/2 hours

Ready mixed concrete should ideally be discharged from the truck within 1 1/2 hours after mixing. This time frame is crucial because concrete begins to set and harden once it has been mixed, and exceeding this duration can compromise its workability, strength, and overall performance. In practice, if concrete is not discharged within this time limit, it may lead to difficulty in placing the concrete properly and may also result in a higher likelihood of segregation, which can negatively affect the final properties of the concrete. Additionally, various regulations and best practices in construction emphasize the importance of ensuring the integrity and quality of materials being used, which aligns with discharging concrete within this recommended period.