7-19 multiplying the contract unit price by the pay factor level determined for the average
strength of concrete in each lot and will be applicable to the total square yar ds of concrete in each lot. Any pavement that fails to attain 3,500 psi in compression is subject to removal . If allowed to remain in place, the pavement will be accepted at a reduced unit price based on a pay factor level of 50% as provided in Article 10 5-3. Where pavement deficient in strength is removed and replaced, the replacement pavement, if acceptable, will be paid at the contract unit price for __" Portland Cement Concrete Pavement, Through Lanes, (with dowels), __" Portland Cement Concrete Pavement, Ramps, (with dowels) or __" Portland Cement Concrete Pavement, Miscellaneous, (without dowels) which price and payment will be full compensation for all work including placement, removal, restoration of subgrade and base and replacement.
D.Multiple Adjus tments in Price Pavement found deficient in both thickness and strength will be evaluated by the Engineer to determine if it may be permitted to remain in place. Pavement permitted to remain in place will be paid at a reduced price determined by successiv ely multiplying the contract price by the appropriate factor indicated for each deficiency.
E.Compensation Payment at the contract unit prices for __" Portland Cement Concrete Pavement, Through Lanes, (with dowels) and __" Portland Cement Concrete Pavement R amps, (with dowels) and __" Portland Cement Concrete Pavement, Miscellaneous, (without dowels) will be full compensation for all work covered by this section.
F.Pay Items Payment will be made under: Pay Item Pay Unit __" Portland Cement Concrete Pavement, Through Lanes (with dowels) Square Yard __" Portland Cement Concrete Pavement, Ramps (with dowels) Square Yard __" Portland Cement Concrete Pavement, Miscellaneous (without dowels) Square Yard
720-1 Description
Perform the work covered by this section including, but not limited to , the construction of Portland cement concrete shoulders in accordance with th is section and with the l ines, grades and dimensions shown on the plans; designing the mix; furnishing and placing the concrete shoulders; furnishing maturity testing equipment; furnishing all admixtures and additives; constructing joints; furnishing joint materials; curing the sh oulder and furnishing curing materials; coring and patching core holes; taking actions to prevent or repair cracking; and removing and replacing unsatisfactory shoulder.
720-2 Materials
Refer to Division 10.
7-20 Item Section
Curing Material s 1026 Dowels and Tie Bars 1070 -6 Joint Filler 1028 -1 Low Modulus Silicone Sealant 1028 -3 Portland Cement Concrete 1000 Water 1024 -4
720-3 Composition of Concrete
Design the concrete mix in accordance with Section 1000.
720-4 Accep Tance of Concrete
The Engineer will test concrete shoulders for acceptance with respect to compressive strength and thickness on a lot by lot basis . A “ lot” is defined in Article 710- 4.
720-5 Equipment
Use equipment in the production and placement of the concrete shoulders in accordance with Section 700 and Section 1000.
720-6 Construction Methods
Place the concrete shoulders only in the presence of an authorized representative of the Engineer. Construct concrete shoulders in accordance with Section 700. Place the full width of the shoulder in a single operation.
720-7 Finishing
Finish the shoulder surface with approved equipment. Hand finishing will be permitted when the use of mechanical finishing equipment is impractical. Perform the final finish ing of the shoulder surface by burlap dragging, brooming or other acceptable methods that will produce a similar surface texture acceptable to the Engineer.
720-8 Joints
Construct and seal all joints in accordance with Article s 700-11 and 700 -12 except as provided in this article. Saw all joints in the concrete shoulder and seal with joint sealer as shown in the plans. Dowels will not be required at the transverse joints in the concrete shoulder. Use tie bars between the concrete pavement and the concrete shoulder. Match the transverse joints in the concrete shoulder with the transverse joints in t he adjacent concrete pavement.
720-9 Thickness Tolerances
The Engineer will determine the thickness of the shoulder by measurement of cores in accordance with AASHTO T 148. A lot for thickness acceptance testing is defined in
Article 710 — 4.
Take one 4 inch core from each lot at a random location as directed by the Engineer . Core each location in the presence of the Engineer. The Engineer will take immediate possession of the cores. Take cores with a diameter of 4 inches and deliver them to the Engineer for measurement. When the required thickness for the shoulder varies, each core will be measured and compared to the required thickness for the shoulder at the location of the core. The deviation of the measured core thi ckness from the required thickness will be recorded as a plus or minus value for each core. Thickness tolerances in Article 710- 9 apply for concrete shoulders.
Source: North Carolina Standard Specifications for Roads and Structures, 2024 Edition. Pages 329–330 of 857.