Maintenance and Rehabilitation

Rigid Pavement Rehabilitation

Dowel Bar Retrofit Construction Practices

Introduction The following describes and illustrates the dowel bar retrofit construction process. In addition, descriptions of critical details for ensuring pavement performance are also included. In general, the dowel bar retrofit process includes the following steps: Using diamond saw blades, sawcut dowel bar slots (three to four per wheelpath). Remove existing concrete within dowel bar … Read more »

Dowel Bar Retrofit

Dowel bar retrofitting is a method used to restore or provide better load transfer across transverse joints or cracks using dowel bars. Usually, dowel bar retrofits are necessitated by excessive faulting due to a loss of aggregate interlock over time. It is interesting to note that much of the rigid pavement built in the U.S. … Read more »

Stitching

Stitching is a rehabilitation technique used at cracks to maintain aggregate interlock and provide added reinforcement to minimize the relative movement of concrete slabs at the cracks. It is also used at the longitudinal joints to keep the slabs from separating. Pavement distresses that require stitching In CPCD, cracks are not intended and could cause … Read more »

Bonded Concrete Overlay

This chapter describes bonded concrete overlays (BCO) on CRCP, not on CPCD. BCO is not a good option for the rehabilitation of CPCD. In the past, concrete pavements were designed and constructed with insufficient thicknesses for today’s traffic demand. This insufficient thickness often resulted in pavement distresses such as punchouts for CRCP and mid-slab cracking … Read more »

Structural PCC Overlays (v1)

PCC overlays of existing rigid pavements have been used for years to restore pavement structural capacity. All types of rigid pavement designs (JPCP, JRCP, CRCP) are appropriate to be overlaid and to be used as overlays. This section briefly describes the AASHTO design procedure for the two major types of PCC overlays: unbonded and bonded. … Read more »

Structural PCC Overlays for PCC Pavement

PCC overlays of existing rigid pavements have been used for years to restore pavement structural capacity. All types of rigid pavement designs (JPCP, JRCP, CRCP) are appropriate to be overlaid and to be used as overlays. This section briefly describes the AASHTO design procedure for the two major types of PCC overlays: unbonded and bonded. … Read more »

Unbonded Concrete Overlay

The PCC overlay pavement rehabilitation technique consisting of a concrete layer over existing PCC pavement with an interlayer between them to break the bond is called an unbonded concrete overlay. The UBCO has been used successfully in many parts of the country. While the existing PCC pavement should be in good condition for the BCO … Read more »

Thin ACP Overlays on CRCP

The service life of an older existing CRCP pavement can often be extended by many years by the addition of a thin Asphalt Concrete Overlay (ACP), sometimes as thin as approximately 2” depending upon the rehabilitation goals and mixture type. This treatment can be applied to pavements that are beginning to show deterioration, getting rough, … Read more »

Retro-fitting Concrete Shoulders

Most of the rigid pavements constructed before the mid 1980’s did not include a tied concrete shoulder. Until 1986, the AASHTO Guide for the Design of Pavement Structures did not consider or give credit for the inclusion of a tied concrete shoulder. Rarely were tied concrete shoulders incorporated in the pavement design. Prior to their … Read more »

Partial Depth Repair Procedures

The following procedures need to be followed for PDR: Identify the Repair Limits When it is determined that PDR is required, it is important to properly evaluate the extent of the spalling and determine the limits of the repair. When spalling occurs, the damage is often extended beyond the visible spalled area. Since most of … Read more »

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