PS Magazine - TB 43-PS-712
PS, The Preventative Maintenance Monthly
ISSUE 712
MARCH 2012
52
PS 712
MAR 12
53
PS 712
MAR 12
J
ust±how±committed±is±
the±Army±to±preserving±
maintenance±dollars?±
± A±new±process±designed±
to±reduce±corrosion±on±
Army±structures±like±aircraft±
hangars±has±some±interest±for±
field-level±Soldiers.
± In±the±past,±as±steel±
structures±developed±rust,±
the±process±was±to±remove±
the±rust,±paints±and±coatings±
down±to±the±bare±metal.±Sand±
blasting±produced±hazardous±
waste.±Wet±methods±helped±
keep±waste±from±getting±
into±the±environment±but±the±
residue±still±had±to±be±treated±
as±hazardous,±resulting±in±
high±disposal±costs.
Many Army concrete structures use reinforcing steel rods (rebar). But rebar can
corrode, especially if water penetrates the concrete.
Corrosion both weakens and expands rebar within the concrete. Eventually the
concrete fractures, weakening the structure.
There is new hope for protecting rebar from corrosion. The penetrating corrosion
inhibiting system (PCIS) is an inhibitor spray applied to concrete surfaces. It penetrates
into concrete, protecting rebar from corrosion.
How well does it work? In Okinawa, Japan, two bridges and a warehouse had
signiFcant rebar corrosion.After some patching of broken concrete, PCIS was applied.
Tests showed a reduction of corrosion rates from 61.4 to 14 microns/year, and water
penetration was reduced from 0.14 to 0.015 ml/sec.
What will a similar investment of lubrication and appropriate rust inhibitors do to
prevent corrosion on your equipment?
± Overcoating,±a±
new±method,±is±more±
promising.±Based±
on±moisture-cured±
polyurethane±(MCPUR),±
overcoating±still±requires±
the±removal±of±loose±
rust±and±coatings.±But±
it±produces±far±less±
hazardous±waste.±With±
minimal±preparation,±
MCPUR±can±be±applied±
directly±over±washed±and±
newly-primed±surfaces,±
including±lead-based±paint±
and±any±remaining±rust.±
J
ust±how±committed±is±
the±Army±to±preserving±
maintenance±dollars?±
± A±new±process±designed±
to±reduce±corrosion±on±
Army±structures±like±aircraft±
hangars±has±some±interest±
for±field-level±Soldiers.
± In±the±past,±as±steel±
structures±developed±
rust,±the±process±was±to±
remove±the±rust,±paints±
and±coatings±down±to±the±
bare±metal.±Sand±blasting±
produced±hazardous±waste.±
Wet±methods±helped±keep±
waste±from±getting±into±the±
environment±but±the±residue±
still±had±to±be±treated±as±
hazardous,±resulting±in±high±
disposal±costs.
Steel Structures
Protecting Rebar
in
concrete
Overcoating Process
for
Steel
Structures
Rusty metal structures
are an
eyesore!
they are
also costly to repair
or replace.
Read on to find out
what the Army is doing
to reduce costs and
increase durability.
This is a
normal
piece
of rebar. although
Soldiers don’t work
with rebar in concrete
very much…
…understanding
rebar corrosion
can help Soldiers
appreciate its
destructive
power.
Would you
look at
this? My new
overcoat will
save my skin
and keep me
from feeling
my true age!
The Army is
taking care
of corrosion
control
for large
structures,
but who’s
going to take
care of the
rust on your
equipment?
There’s no one
better than
you!
Awesome!
I already
feel 20
years
younger!
A
hhh,
that
spray
is
making
me feel
much
better!
Thanks, Doc!
I should last
a
lot
lOnger
now!
712 52-53.indd
1-2
1/31/12
10:35 AM
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