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- Subject: Fw: Bullet-proof concrete
- From: "Richard Fennell" <rpfennell(--nospam--at)doingsteel.com>
- Date: Fri, 24 Jan 2003 08:53:16 -0600
I wonder if a concrete hardener would help.
I knew of a guy that made a hardener they used on aircraft runways. Those contacts are long lost, but I'm sure they still make it.
Another product I've heard of adds fiberglass type material to the concrete. The intended purpose is to pour one huge floor without control joints and no cracking.
I hope this gives you some ideas.
----- Original Message -----
From: Kipke, Richard
Sent: Friday, January 24, 2003 8:24 AM
Subject: Bullet-proof concrete
Is anyone familiar with any research or papers regarding concrete walls subjected to rifle fire? I am designing a pre-cast concrete gate house which needs to resist Department of Justice classification Level III as stated below:
2.5 Type III (Rifles)
This armor protects against 7.62 mm Full Metal Jacketed (FMJ) bullets (U.S. Military
designation M80), with nominal masses of 9.6 g (148 gr) impacting at a minimum velocity of
838 m/s (2750 ft/s) or less. It also provides protection against the threats mentioned in sections
2.1, 2.2, 2.3, and 2.4.
Right now I have a 5" thick concrete wall and have no feel on how well it would do. Would concrete additives such as steel fiber or poly fiber offer additional resistance. I can probably thicken the wall as needed.
Any assistance would be appreciated.
Thanks in advance,
Rich Kipke, PE
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