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Re: CONC - Repair Of Member Subjected To Bomb

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If I interpret your post correctly, you will write a specification for a
contractor to repair the roof which was subjected to an explosive charge
in order to have an opening for access.  It is a general practice in
concrete repair to remove loose debris and cracked concrete until sound
concrete is exposed.

It is also believed that the most concrete damage is closest to the
charge location.  Destructive energy is inversely proportional to the
square or cubic of distance.   Thus, if you start from the point closest
to the charge location and work outwards until sound concrete is
reached, there should not be a de-bonding concern beyond that point of
sound concrete.  If your concern is damage caused by stress wave
propagation in the reinforced concrete, theoretical calculations based
on assumptions are probably not as reliable as field observations.

Just a question out of curiosity.  Why not use saw cut for access
instead of explosive?

Best regards,

Chang Chen, Ph.D., P.E.
Apollo Consulting, Inc.

CanitzCF wrote:

>   I've been tasked to suggest recommendations for a concrete roof of
> an
> underground structure subjected to an explosive charge. The roof is
> 24" thick
> and was designed as a two way slab. The charge is such that it will
> provide an
> opening through the slab to allow access of one person.
>   There are various publications which provide guidance for
> recommended
> repairs of   concrete damaged due to poor design or workmanship. The
> Corps has
> published a Technical Manual for the design of blast resistant
> structures.
> However, I not aware of any guidance for the repair of an existing
> concrete
> structure subjected to a blast.
> Beyond the visible surface damage, I'm primarily concerned about
> subsurface
> damage such as loss of bond between the concrete and reinforcement.
> Any
> suggestions or recommendations?
> Thanks in advance.
> Charlie Canitz, PE
> Bel Air, MD