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

(4) When using preformed compression seals, the joint should be
designed so that the seal will be in 20 to 50 percent
compression at all times. The surface of the seal should be
recessed l/8- to 3/G-inch to protect it from traffic.
Additional information can be obtained from FHWA Technical
Paper 89-04, "Preformed Compression Seals" [S] for PCC
pavement joints."
5. LONGITUDINAL JOINTS
b.
C.
d.
e.
. Longitudinal joints are used to relieve warping stresses and are
generally needed when slab widths exceed 15 feet. Widths up to
and including 15 feet have performed satisfactorily without a
longitudinal joint, although there is the possibility of some
longitudinal cracking. Longitudinal joints should coincide with
pavement lane lines whenever possible, to improve traffic
operations. The paint stripe on widened lanes should be at 12
feet and the use of a rumble strip on the widened section is
recommended.
Load transfer at longitudinal joints is achieved through aggregate
interlock. Longitudinal joints should be tied with tiebars to
prevent lane separation and/or faulting. The tiebars should be
mechanically inserted and placed at mid-depth. When using Grade
40 steel, S/8-inch by SO-inch or l/2-inch by 24-inch tiebars
should be used. When using Grade 60 steel, S/8-inch by 40-inch or
l/2-inch by 32-inch tiebars should be used. These lengths are
necessary to develop the allowable working strength of the tiebar.
Tiebar spacing will vary with the thickness of the pavement and
the distance from the joint to the nearest free edge. Recommended
tiebar spacings are provided in..Table 3.
Tiebars should not be placed within 15 inches of transverse
joints. When using tiebars longer than 32 inches with skewed
joints, tiebars should not be placed within 18 inches of the
transverse joints.
The use of corrosion-resistant tiebars is recommended, as
corrosion can reduce the structural adequacy of tiebars.
It is recommended that longitudinal joints be sawed and sealed'to
deter the infiltration of surface water into the pavement
structure. A 3/&inch wide by l-inch deep sealant reservoir
should be sufficient.
3.1.7 ”