Compacting an Excavation Flashcards
1
Q
After the tracer wire, how many inches of compacted bedding is required?
A
4”
2
Q
How many inches of compacted padding is required above the pipe?
A
8”
3
Q
What is the minimum amount of passes per lift with a compactor
A
4
4
Q
What pattern is used during compaction?
A
Starting around the perimeter, move inward towards the center in a spiral pattern
5
Q
What tool is used to verify proper compaction?
A
DCP
(Dynamic Cone Penetrometer)
6
Q
For standard excavations what is the minimum number of DCP tests?
A
Minimum of 1
Preferred 3
3” from the edge
7
Q
For longer trench excavations what is the number of DCP tests required?
A
3 DCP tests evert 25’
8
Q
What is the minimum number of drops for 95% compaction in rock and sand?
A
18 Drops
