ITEM 305 PORTLAND CEMENT CONCRETE BASE
305.01
Description
305.02
Construction
305.03 Method
of Measurement
305.04 Basis of
Payment
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 451.08.
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 451.11
to 200 square feet per gallon (5 mē/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 451.10 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 451.18.A.
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.
For
base found deficient in strength, the Department will pay a reduced price
according to 451.18.B and table 451.19-2. Use the determination and
pay procedures for non QC/QA items.
The
Department will pay for accepted quantities at the contract price as follows.
Item
Unit
Description
305
Square
Yard
Concrete Base
(Square Meter)