30 June 2001
f. If the existing pavement is not composed of nonfrost-susceptible materials sufficient to
eliminate substantial frost penetration into an underlying frost-susceptible material, an appropriate
reduction in the k value will be made in accordance with Chapter 20.
g. After the construction of the rigid pavement inlay, the working areas used for forming or
slipforming the sides of the concrete will be backfilled to within 100 millimeters (4 inches) of the
pavement surface with either lean-mix concrete or normal paving concrete.
h. The existing bituminous concrete will be sawed parallel to and at a distance of 3 meters
(10 feet) from each edge of the inlay. The bituminous concrete surface and binder courses and, if
necessary, the base course will be removed to provide a depth of 100 millimeters (4 inches). The
exposed surface of the base course will be recompacted, and a 3-meter (10-foot) wide paving lane
of bituminous concrete, 100 millimeters (4 inches) thick, will be used to fill the gap (Figure 18-1).
The bituminous concrete mix will be designed in accordance with Chapter 9.
I. In cases where the 3-meter (10-foot) width of new bituminous concrete at either side of the
inlay section does not permit a reasonably smooth transition from the inlay to the existing
pavement, additional leveling work outside of the 3-meter (10-foot) lane will be accomplished by
removal and replacement, planer operation, or both.
RIGID INLAYS IN EXISTING RIGID PAVEMENT.
a. Figure 18-2 shows a section of a typical rigid pavement inlay in an existing rigid pavement.
b. The existing rigid pavement will be removed to the nearest longitudinal joints that will
provide the design width of the rigid pavement inlay. Care will be exercised in the removal of the
existing rigid pavement to preserve the load-transfer device (key, keyway, or dowel) in the
longitudinal joint at the edge of the new inlay pavement. If the existing load-transfer devices can
be kept intact, they will be used to provide load transfer between the rigid pavement inlay and the
existing pavement except that a male key will be removed. If the load-transfer devices are
damaged or destroyed, a thickened-edge joint shall be used to protect against edge loading of the
existing pavement or the face shall be sawed vertically and dowels installed. In addition to the
removal of the existing pavement, the existing base and/or subgrade will be removed to the depth
required for the design thickness of the rigid pavement inlay.
c. The criteria for subdrains, stabilization, soil strength and frost also pertain to rigid
pavement inlays in existing rigid pavements.
d. The design of the rigid pavement inlay, including joint types and spacing, will be in
accordance with the chapter pertaining to the type of rigid pavement selected.