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RE: Bullet-proof concrete

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One possible source is "Fundamentals of Protective Design" TM 5-855-1,
Department of the Army, July 1965.  The Navy also has similar design guides
but I don't have a name.  ACI or PCA may also have information.

                      "Eric Green"                                                                                            
                      <EGreen@walterpmo        To:       <seaint(--nospam--at)>                                                  
            >                 cc:                                                                            
                                               Fax to:                                                                        
                      01/24/03 08:13 AM        Subject:  RE: Bullet-proof concrete                                            
                      Please respond to                                                                                       

According to FM 5-103 ? Survivability (pg. 3-11), 6" of reinforced concrete
is required to resist a direct hit by a 7.62 mm bullet at 100 meter range
(FYI, its 30 inches for those pesky RPG-7s).

P.S. Please kill yourself if you are not cleared for this information :-)

Eric Green
Walter P Moore

      -----Original Message-----
      From: Kipke, Richard [mailto:Richard.Kipke(--nospam--at)]
      Sent: Friday, January 24, 2003 8:24 AM
      To: 'seaint(--nospam--at)'
      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
      Earth Tech

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