When constructing this item,
the requirements of 451
apply with the following exceptions:
- Reinforcing mesh required by 451.08
is not required in concrete base.
- Provide dowels at transverse
contraction joints in mainline pavement, ramps, acceleration/deceleration
lanes, or collector/distributor lanes.
Dowels are not required in shoulders for mainline pavement, ramps,
acceleration/deceleration lanes, or collector/distributor lanes unless the
transverse contraction joint is located within 500 feet of a pressure
- Construction joints are not to
be placed within 6 feet of another parallel joint.
- The curing application rate for
the membrane forming, curing compound for concrete base is 200 square feet
per gallon (5 square meters per liter) instead of what is specified for 451
pavement described in 451.11.
- The surface finish for concrete
base is broom dragged in either the longitudinal or the transverse
direction to provide a uniform, gritty surface texture to the satisfaction
of the Engineer. Tining per 451.10
is not required.
- Surface smoothness variations
for concrete base are not to exceed 1/4 inch in 10 feet (6 mm in 3 m).
- Station numbers as required in 451.10
are not required for concrete base.
The concrete base must be
field measured and the area of pavement placed be calculated for payment in
square yards (square meters). The area
is determined the same as 451
The pavement width for
payment will be based on the plan typical cross-section, plus any additional
widening that has been directed by the Engineer. The length will be field measured along the
centerline of the roadway or ramp.
Determine thickness of the
base conforming to 451.18.A.
Pay a reduced price for base
found deficient in thickness according to 451.19.A. There is no additional payment for a concrete
base thicker than that shown in the plans.
Pay for accepted quantities at the Contract price per square yard
- Document subgrade/subbase
- Document contraction,
expansion, and longitudinal joints dowel as well as tiebar
sizes, type, coating, support, placement, and spacing.
- Document forms set
100 percent bearing, correct alignment and grade, rigid, clean, and oiled.
- Document length of
lap and clearance maintained on steel mesh.
contraction joint spacing, dowels oiled, dowel assembly tie wires removed,
number and size of pins used to hold dowel assembly, and alignment of
- For slip form
Approval of slip
dowels using MIT Scan-2.
- Document concrete
placement including all quality control testing, method of placement,
finishing, curing (type and amount), and weather conditions.
- Document use of HIPERPAV software, time of sawing, and depth and width
of sawed joints.
- Document coring
for thickness verification and results.
10. Record results of beam breaks and opening to traffic.
11. Measure length and width for pay.
12. Document on CA-D-3A
or CA-D-3B or other approved forms.