UFC 3-260-02
30 June 2001
C = 1.00 - Pavements in the trafficked areas are in good condition with little or no
short-spaced transverse (305- to 610-millimeter (1- to 2-foot)) cracks,
no longitudinal cracking, and little spalling or raveling along cracks
C = 0.75 - Pavements in the trafficked areas exhibit short-spaced transverse
cracking but little or no interconnecting longitudinal cracking because of
load and only moderate spalling or raveling along cracks
C = 0.35 - Pavements in the trafficked areas exhibit severe short-spaced
transverse cracking and interconnecting longitudinal cracking because
of load, severe spalling along cracks, and initial punchout-type failures
c. Nonrigid Overlay. The following values of C are assigned for the following conditions of
plain and reinforced concrete pavement.
(1) Condition of existing plain concrete pavements.
C = 1.00 - Pavements in the trafficked areas are in good condition with some
cracking because of load but little or no progressive-type cracking
C = 0.75 - Pavements in the trafficked areas exhibit progressive cracking because
of load and spalling, raveling, and minor faulting at joints and cracks
C = 0.50 - Pavements in the trafficked areas exhibit multiple cracking along with
raveling, spalling, and faulting at joints and cracks
(2) Condition of existing reinforced concrete pavement.
C = 1.00 - Pavements in the trafficked areas are in good condition but exhibit
some closely spaced load-induced transverse cracking, initial
interconnecting longitudinal cracks, and moderate spalling or raveling of
joints and cracks
C = 0.75 - Pavements in trafficked areas exhibit numerous closely spaced load-
induced transverse and longitudinal cracks, rather severe spalling or
raveling or initial evidence of punchout failures
6.
RIGID OVERLAY OF EXISTING RIGID PAVEMENT.
a. General. There are three basic equations for the design of rigid overlays which depend
upon the degree of bond that develops between the overlay and existing pavement: fully bonded,
partially bonded, and nonbonded. The fully bonded overlay equation is used when special care is
taken to provide bond between the overlay and the existing pavement. The partially bonded
equation will be used when the rigid overlay is to be placed directly on the existing pavement and
no special care is taken to provide bond. A bond-breaking medium and the nonbonded equation
will be used when (a) a plain concrete overlay is used to overlay an existing reinforced concrete
pavement, (b) when a continuously reinforced or prestressed concrete overlay is used to overlay an
existing plain concrete or reinforced concrete pavement, (c) when a plain concrete overlay is being
used to overlay an existing plain concrete pavement that has a condition factor C # 0.35, and
17-5
Previous Page
