3.6.4. Acceptance Criteria

Try these first

1. 1.

   What is the minimum percent of MDD for subgrade compaction?

   Hint

   Think about how compaction standards are set for layers.

2. 2.

   What is MDD short for in soil compaction?

   Hint

   Consider what MDD measures.

3. 3.

   What is the required percentage of MDD for subbase layers?

   • 90-95%
   • 95-100%
   • 80-85%

   Hint

   Think about load-bearing requirements.

4. 4.

   True or False: The acceptance criteria for subgrade is lower than that of the base layers.

   • True
   • False

   Hint

   Remember their roles in the pavement structure.

5. 5.

   You are tasked with designing a highway pavement. Your laboratory tests indicate the Modified Proctor MDD is 140 lbs/ft³. What are the compaction requirements for each layer? Discuss the impact of not meeting these requirements.

   Hint

   Remember the percentage ranges for each layer.

6. 6.

   Given the soil compaction percentage data from a recent construction site, analyze the potential risks to pavement longevity if the subbase was only compacted to 92% of MDD, whereas it should have been 95-100%.

   Hint

   What are the consequences of inadequate support for additional layers?