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RE: bullet proof concrete?

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The equations for concrete resistance to ballistic impact is contained in the TM5-1300, Section 4-60, AKA the Thor Equations. 
I believe they were named after some Canadian ;>).

Harold Sprague

-----Original Message-----
From: Harold Sprague [mailto:spraguehope(--nospam--at)]
Sent: Sunday, May 25, 2008 11:47 AM
To: seaint(--nospam--at)
Subject: RE: bullet proof concrete?

Use the Thor equations for basic penetration mechanics.  Penetration mechanics is a very complicated topic.  I would not want to certify anything without running the actual UL 752 or DOJ tests.  The Thor equations will get you to a starting point. 

Harold Sprague

From: AErickson(--nospam--at)
To: seaint(--nospam--at)
Date: Fri, 23 May 2008 16:23:08 -0500
Subject: bullet proof concrete?

A friend of mine is asking me what kind of concrete would be equivalent to a UL 752 level 3 bullet proof rating, they are thinking of replacing  a compressed ballistic grade fiberglass roving with something cheaper in a new construction project. Perhaps some kind of masonry would also be an option… I am not familiar with hardened construction standards, is there a resource out there I could look at? Any experiences to learn from?



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