This item of work involves construction of a non-reinforced Portland cement concrete pavement on a prepared surface. The same methods and practices are utilized in the construction of 452 Pavement with some exceptions listed below. The major difference between 451 and 452 Pavement is the elimination of the steel reinforcing mesh in the 452 specification.
Non-reinforced Portland cement concrete pavement is constructed in accordance with 451 with the following exceptions:
1. Reinforcing mesh specified in 451.08 is not required.
2. Dowels are required in transverse contraction joints in mainline pavement, ramps, acceleration/deceleration lanes, and collector/distributor lanes, but not in concrete shoulders adjacent to the above-listed pavements unless the contraction joints are within 500 feet (150 m) of a pressure relief joint.
3. The spacing of contraction joints in 452 is 15 feet (4.6 m) unless the 452 Pavement is placed as a shoulder tied to 451 or 305 Pavement. In this case, the joints in the 452 Pavement must match the spacing, alignment, sawing, and sealing requirements of the adjacent pavement.
4. Construction joints in 452 Pavement must not be located closer than 6 feet (1.8 m) from another parallel joint.
Payment for 452 Pavement is the same as for 451 Pavement. Payment is made for accepted quantities of pavement by the square yard (square meter) at the contract bid price. If pavement is found to be deficient in thickness or compressive strength, the Department will pay a reduced price according to 451.19.
There is no additional payment for any pavement constructed and found to have an average thickness in excess of the thickness specified.
1. Document subgrade/subbase preparation.
2. Document contraction, expansion, and longitudinal joints dowel and tiebar sizes, type, coating, support, placement, spacing.
3. Document forms set 100 percent bearing, correct alignment and grade, rigid, clean and oiled.
4. Document length of lap, clearance maintained on steel mesh.
5. Document contraction joint spacing, dowels oiled, dowel assembly tie wires removed, number and size of pins used to hold dowel assembly, and alignment of dowels.
6. For slip form construction document:
a. Test section results.
b. Approval of slip form paver.
c. Alignment of dowels using MIT Scan-2.
d. Corrective action as required.
7. Document concrete placement, including all quality control testing, method of placement, finishing, tining, curing (type and amount), stamping of stationing, and weather conditions.
8. Document use of HIPERPAV software, time of sawing, and depth and width of sawed joints.
9. 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.