TM 5-822-5/AFM 88-7, Chap. 1
be cleaned of loose materials, and any potholing or
(2) Condition
of
Existing
Reinforced
unevenness exceeding about 1 inch will be repaired
Concrete Pavement:
by cold planing or localized patching or the
C
= 1.00 -- Pavements are in good condi-
application of a leveling course using bituminous
tion with little or no short-spaced
concrete, sand-asphalt, or a similar material.
transverse (1-to 2-foot) cracks, no
b. Flexible overlay. When a flexible overlay is
longitudinal cracking, and little spalling
used, no special treatment of the surface of the ex-
or raveling along cracks.
isting rigid pavement will be required, other than
C
= 0.75 -- Pavements exhibit short-
the removal of loose material. When the flexible
spaced transverse cracking but little or
overlay is all-bituminous concrete, the surface of the
no interconnecting longitudinal cracking
existing rigid pavement will be cleaned of all foreign
due to load and only moderate spalling
matter, spalled concrete, fat spots in bituminous
or raveling along cracks.
patches, and extruded soft or spongy joint seal
C
= 0.35--Pavements exhibit severe short-
material. Joints or cracks less than 1 inch wide in
spaced transverse cracking and intercon-
the existing rigid pavement will be filled with joint
necting longitudinal cracking due to load,
sealant. Joints or cracks that are 1 inch or greater in
severe spalling along cracks, and initial
width will be cleaned and filled with an acceptable
punchout-type failures.
bituminous mixture (such as sand asphalt) which is
compatible with the overlay. Leveling courses of
c. Flexible Overlay. The following values of C
bituminous concrete will be used to bring the
are assigned for the following conditions of plain
existing rigid pavement to the proper grade when
and reinforced concrete pavement.
required. Prior to placing the all-bituminous
(1) Condition of Existing Plain Concrete
concrete, a tack coat will be applied to the surface
Pavements:
of the existing pavement.
C
= 1.00 -- Pavements are in good condi-
14-4. Condition of Existing Rigid Pavement.
tion with some cracking due to load but
a. General. The support that the existing rigid
little or no progressive-type cracking.
pavement will provide to an overlay is a function of
C
= 0.75 -- Pavement exhibit progressive
its structural condition just prior to the overlay. In
cracking due to load and spalling,
the overlay design equations, the structural
raveling, and minor faulting at joints and
condition of the existing rigid pavement is assessed
cracks.
by a condition factor C. The value of C should be
C
= 0.50--Pavements exhibit multiple
selected based upon a condition survey (TM 5-826-
cracking along with raveling, spalling,
6/AFR 93-5) of the existing rigid pavement. Inter-
and faulting at joints and cracks
polation of C values between those shown below
(2) Condition
of
Existing
Reinforced
may be used if it is considered necessary to define
Concrete Pavement.
more accurately the existing structural condition.
b. Plain concrete overlay. The following values
C
= 1.00 -- Pavements are in good condi-
of C are assigned for the following conditions of
tion but exhibit some closely spaced
plain and reinforced concrete pavements.
load-induced transverse cracking, initial
(1) Condition of Existing Plain Concrete
interconnecting longitudinal cracks, and
Pavement:
moderate spalling or raveling of joints
and cracks.
C
= 1.00 -- Pavements are in good condi-
C
= 0.75 -- Pavements in trafficked areas
tion with little or no structural cracking
exhibit numerous closely spaced load-
due to load.
induced transverse and longitudinal
C
= 0.75 -- Pavements exhibit initial
cracks, rather severe spalling or raveling,
cracking due to load but no progressive
or initial evidence of punchout failures.
cracking or faulting of joints or cracks.
C
= 0.35 -- Pavements exhibit progressive
14-5. Rigid Overlay of Existing Rigid
cracking due to load accompanied by
Pavement.
spalling, raveling, or faulting of cracks
a. General. There are three basic equations for
and joints.
the design of rigid overlays which depend upon the
14-2
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