chapter 3 rigid pavement - DOT On-Line Publications - Department ...

FHWA TECHNICAL ADVISORY T 5080.14
June 5, 1990
C. Bases
(2) Transverse Reinforcina and Tiebars
(a) If transverse reinforcement is included, it should be
#4, #5, or #6 grade 60 deformed bars meeting the same
specifications as mentioned for the longitudinal
reinforcement.
(b) Although it can be omitted, transverse reinforcing
reduces the risk of random longitudinal cracks opening
up and thus reduces the potential of punch-outs. If
transverse reinforcement is -included, the following
equation can be used to determine the amount of
reinforcement required (see number 5 of Attachment 2):
4 F
Pl - - x 100
2fs
Where: transverse steel, X
= total pavement width, (ft)
subbase friction factor
allowable working stress in steel,
psi, (0.75 yield strength)
(c) The spacing between transverse reinforcing bars can be
calculated using the following equation (see numbers 1
and 5 of Attachment 2):
9
Y= x 100
4 D
Where: = transverse steel spacing (in)
= cross-sectional area of steel, (in')
per bar (#4, #5, or #6 bar)
Pl = percent transverse steel
D = slab thickness (in)
Note: The transverse bar spacing should be
no closer than 36 inches and no further
than 60 inches.
(d) In cases where transverse steel is omitted, tiebars
should be placed in longitudinal joints in accordance
with the FHWA Technical Advisory, Concrete Pavement
Joints.
(1) The base design should provide a stable foundation, which
is critical for CRCP construction operations and should not
trap free moisture beneath the pavement. Positive drainage
3.6.4