Does anyone have experience of using ground penetrating radar in this situation to measure relative density?

-----Original Message-----
From: David Hughes [mailto:[log in to unmask]]
Sent: 08 February 2001 15:53
To: [log in to unmask]
Subject: compaction of trench backfill

Has anyone any ideas on how to measure the compaction of backfill in a
trench?  I would like to monitor density with depth during compaction.

The measurement needs to be carried out in a non destructive way (ie no
excavation after compaction)

I'm thinking along the lines of pressure cells or strain coils.

Any other ideas?  Is the dynamic measurement of surface compaction reliable!

thanks

David

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Dr David Hughes CEng
School of Civil Engineering
Queen's University Belfast
Belfast BT7 1NN
N Ireland

ph  +44 (0)28 90 274014
fax +44 (0)28 90 663754
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