304.5 Class Of Concrete; 305 Warranty Concrete; 306 Smoothness Specifications; 307 Composite Pavement - Huawei Y360-U03 Faq

300 Rigid Pavement Design

304.5 Class of Concrete

Class QC1 is recommended for all mainline, shoulder, and ramp concrete in excess of 250 feet
(75 m) of continuous pavement.
Class QC MS or QC FS may be used for smaller, repair-type areas. These mixes are intended
for joint and crack repairs or individual slab replacements. They are not intended for long stretches of
continuous pavement and are not expected to perform well if used in such applications.
The QC/QA designation is to be added if any single concrete pavement pay item exceeds 10,000
square yards (8500 square meters). The QC/QA designation may be added to all concrete pavement
items if any single item meets the threshold.

305 Warranty Concrete

The use of warranty concrete does not change the thickness design in any way. The same inputs
are used and the same thickness is determined regardless of whether warranty concrete will be used or
conventional Item 451 or 452 concrete. More information on concrete pavement warranties is available in
the Warranty Application Guidelines in the Innovative Contracting Manual published by the Office of
Construction Administration and in the Item 884 Portland Cement Concrete Pavement (7 Year Warranty)
specification.

306 Smoothness Specifications

Incentive/disincentive for smoothness is specified using Proposal Note 420 Surface Smoothness
Requirements for Pavements. PN 420 is recommended for all eligible projects. The Designer Note
details the eligibility requirements. Smoothness incentives generally result in better attention to detail by
the contractor and higher quality pavement overall. Smooth, high quality pavements are expected to
perform better for a longer time, potentially resulting in cost savings to the Department.
The designer should ensure the contractor has a reasonable opportunity to achieve the incentive.
Projects that may otherwise be eligible but have numerous manholes, drainage structures, business or
residential driveways, etc., are usually not good candidates for smoothness incentive.

307 Composite Pavement

Composite pavement herein refers to a rigid base with an asphalt surface. Composite pavements
are rarely designed and built on ODOT projects. When they are used it is often at the request of a local
government agency.
consideration may be given to the design and specification of a composite pavement.
307.1 Composite Pavement Design
Composite pavements are designed as rigid pavements.
determined, the concrete thickness is reduced by one inch (25 mm) and replaced with 3 or 3.25 inches
(75 mm - 83 mm) of asphalt. This ratio of 1 inch (25 mm) of concrete to 3 inches (75 mm) of asphalt
holds true only for the first inch (25 mm) of concrete removed and is an approximation at best.
The minimum asphalt overlay thickness on a rigid pavement or base is 3 inches (76 mm). Lift
thickness requirements for specific asphalt materials may require a 3.25 inch (83 mm) minimum overlay
thickness. The minimum concrete thickness of 8 inches (200 mm) still applies.
July 2014
Where local preference is strong and there has been good performance,
Once the required thickness is
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