305.01 Description. This work consists of constructing a portland cement concrete base on a prepared surface.
305.02 Construction. The requirements of Item 451 apply, except as follows.
Do not comply with the requirements of 451.07.
Provide dowels at transverse contraction joints in mainline pavement, ramps, acceleration/deceleration lanes, or collector/distributor lanes. Dowels for contraction joints in concrete shoulders on mainline pavement, ramps, acceleration/deceleration lanes, or collector/distributor lanes are not required unless the contraction joint is located within 500 feet (150 m) of a pressure relief joint.
Do not place construction joints within 6 feet (1.8 m) of another parallel joint.
Modify the curing membrane application rate specified in 451.10 to 200 square feet per gallon (5 m2/L) of treated pavement surface.
Produce a final surface with a uniform, gritty, longitudinal, or transverse texture using a broom drag in either direction.
Ensure that pavement surface variations do not exceed 1/4 inch in 10 feet (6 mm in 3 m).
Impressing station numbers into the plastic concrete as specified in 451.09 is not required.
305.03 Method of Measurement. The Department will measure Concrete Base by the number of square yards (square meters) completed and accepted in place. The width equals the base width shown on the typical cross-section of the plans plus additional widening as the Engineer directs in writing. The Department will field measure the length along the centerline of each roadway or ramp.
305.04 Basis of Payment. For base found deficient in thickness, the Department will pay a reduced price according to 451.17.
The Department will not make additional payment over the Contract unit price for any base with an average thickness in excess of that shown on the plans.
The Department will pay for accepted quantities at the contract price as follows.
Item Unit Description
305 Square Yard Concrete Base