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Re: Bullet-proof concrete

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You should probably speak with someone at the US Army Corps of Engineers. I have heard of various techniques used for live fire areas. In a practical range with a city setting they are sometimes using foamed or lightweight concrete so that the bullets penetrate the concrete and don't ricochet during live fire.

I have also heard about techniques used to spread the impact or absorb it, minimizing damage. These techniques include a sacrificial layer of some material or a material (such as fibers) that can spread the impact.

These may not be techniques you are looking for, but I think they are interesting, nonetheless.

Jay Shilstone

At 06:24 AM 1/24/03 -0800, you wrote:
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
Earth Tech