300.1 Introduction; 300.2 Types Of Concrete Pavement - Huawei Y360-U03 Faq

300 Rigid Pavement Design
300 Rigid Pavement Design

300.1 Introduction

Rigid pavements can be constructed with contraction joints or no joints, with dowels or without
dowels, and with reinforcing steel or without steel. For jointed concrete pavements, regardless of
whether reinforced or non-reinforced, the AASHTO/ODOT method of pavement design calculates the
same required thickness. The required thickness is a function of loading, material properties including
subgrade, and type of load transfer, if any. Alterations to rigid pavement material specifications, jointing
considerations, and mesh provisions to something other than those provided in ODOT's Construction and
Material Specifications (C&MS) or ODOT's Standard Construction Drawings may require adjustments to
the procedures described herein.
The Construction Inspection Manual of Procedures published by the Office of Construction
Administration contains additional information on rigid pavement and proper construction practices.

300.2 Types of Concrete Pavement

ODOT has two basic types of concrete pavement: reinforced and non-reinforced. There are
currently three different specifications for concrete pavement and one for concrete base. All of the
concrete specifications relate back to either reinforced or non-reinforced. The current specifications are:
Item 451 Reinforced Concrete Pavement, Item 452 Non-Reinforced Concrete Pavement, Item 884
Portland Cement Concrete Pavement (7 Year Warranty), and Item 305 Concrete Base.
concrete pavements included in the C&MS and Supplemental Specifications are jointed. Continuously
reinforced concrete pavement is no longer used and the specification item has been removed from the
C&MS.
Item 451 Reinforced Concrete Pavement is the basic specification referred to by all other
concrete pavement specifications. Reinforced concrete contains steel wire mesh intended to tightly hold
together any cracks that occur. The steel mesh does not add any structural capacity and does not impact
the thickness design. A reinforced pavement is the same thickness as a non-reinforced one. The
reinforcing steel allows longer joint spacing with the expectation that mid-panel cracks will form but the
steel will hold them tightly together and not allow further deterioration.
approximately 1/8 inch (3 mm) wide) are common, even expected, in reinforced pavements and are little
cause for concern. Wider cracks likely mean the steel has failed and the cracks are going to deteriorate
and need repair. Throughout the 1950's, 60's, 70's, 80's, and early 90's ODOT built mainly reinforced
pavements.
Item 452 Non-Reinforced Concrete Pavement is nearly identical to Item 451 but does not contain
the steel reinforcing mesh. Non-reinforced pavements use shorter joint spacing in an attempt to eliminate
mid-panel cracking. Any cracks in non-reinforced pavement, even hairline, are likely to deteriorate and
require repair. In the late 1990's, ODOT began using more non-reinforced pavements. Currently, non-
reinforced is the preferred concrete pavement type.
Item 884 Portland Cement Concrete Pavement (7 Year Warranty) requires the contractor to
choose either 451 or 452 pavement and warrant it against specific distresses for seven years.. As of
publication, in most cases contractors have elected to use 452. The warranty requirements allow hairline
cracks in 451 but not in 452.
Item 305 Concrete Base is non-reinforced concrete used when constructing a composite
pavement. Because this item is intended to be overlayed with asphalt, the surface texture, curing, and
smoothness requirements are less than for exposed concrete pavement surfaces. Item 305 is never to
be used as a permanent pavement surface. Throughout this Manual, references to concrete or rigid
pavement include item 305 unless stated otherwise.
July 2014
All of the
Hairline cracks (less than
300-1