Removal of the full depth of the existing asphalt layerĪnd predetermined portion of the underlying base by ¢ Full-depth reclamation (FDR) with asphalt overlayâ Ment fitted with closely spaced diamond saw blades. ¢ Diamond grindingâremoving a thin layer (0.12 toĠ.25 in.) of the existing concrete surface using equip. Joints and cracks of an existing JPCP concrete pavement ¢ Dowel bar retrofitâplacing dowel bars at the transverse Or break and seat of an existing concrete pavement and
¢ Crack or break and seat with asphalt overlayâcrack ¢ Crack or break and seat with an unbonded overlayâĬrack or break and seat of an existing concrete pavementĪnd overlay with an unbonded CRCP or JPCP overlay. SURVEY OF AGENCY PAVEMENT DESIGN PRACTICESĪsphalt overlay and/or a chip seal(s) or other surface Ing, and compacting in-place followed by either a thin Recycling agent, additives, and virgin aggregate, relay. ¢ CIR without asphalt overlayâmilling (typically 3 toĤ in.) and mixing the existing asphalt surface with Milling (typically 3 to 4 in.) and mixing the existingĪsphalt surface with recycling agent, additives, and virginĪggregate, relaying, and compacting in-place followed by ¢ Cold in-place recycle (CIR) with asphalt overlayâ ¢ Bonded JPCP overlayâplacing a JPCP overlay directly Over (i.e., no interlayer) an existing concrete pavement ¢ Bonded CRCP overlayâplacing a CRCP overlay directly Synthesis include (not all of the following treatment typesĪre included in or have nationally calibrated performance In addition, the pavement type definitions for preservationĪnd rehabilitation treatments used in the survey and in this Placed over unbound aggregate base layers. Imply either layer type) surface layer less than 6 in. ¢ Thin asphaltâhot or warm mix asphalt (that will beĭesignated as asphalt in this synthesis, but is intended to Thick over unbound aggregate base layers. ¢ Thick asphaltâasphalt surface layer greater than 6 in. Base layers mayĬonsist of unbound aggregate and/or stabilized layers. ¢ Semi-rigidâthin or thick asphalt surface layer placed May consist of unbound aggregate and/or stabilized ¢ JPCPâconcrete pavement with short joint spacing,Īnd with or without dowel bars (10 to 20 ft). Layer placed over stabilized subgrade or placed directly ¢ Full-depth asphaltârelatively thick asphalt surface May consist of unbound aggregate and/or stabilized layers. Ment to hold shrinkage cracks tightly closed. ¢ CRCPâconcrete pavement with longitudinal reinforce. ¢ Compositeânew thin or thick asphalt surface layer overĪ new concrete layer. Pavement types have nationally calibrated pavement perfor. Which are based on the pavement type definitions included in In this synthesis for new construction pavement types, all of The following provides definitions used in the survey and Nine Canadian provincial and territorial governments. Questionnaire is provided in Appendix A, and the agencyĪs of March 2013, 57 agencies (90%) responded to the Puerto Rico, and the District of Columbia, and Canadian
The pavement design engineers of the state highway agencies, The intended recipients of the survey questionnaire were ¢ Development of training programs and implementation ¢ Benefits accrued to the agency from implementation ¢ Agency lessons learned that can be used to help other ¢ Approaches and parties involved in the evaluation and ¢ Agency implementation challenges or impediments. Ment the MEPDG and AASHTOWare Pavement ME
¢ Reasons an agency has postponed or has yet to imple. ¢ Availability and quality of required data inputs. ¢ Level of staff expertise in ME pavement design principles. ¢ Use of consultants and in-house personnel for pavement This structure for successful implementation. ¢ Organizational structure and steps required to work within ¢ Agency decision-making authority for pavement design. The questionnaire focused on the practices, policies,Īnd procedures that have been successfully used by highwayĪgencies for implementing the MEPDG and AASHTOWare Provincial transportation agencies in relation to the MEPDGĪnd accompanying AASHTOWare Pavement ME Design⢠Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.Ī survey was developed to determine the implementationĮfforts of U.S., Puerto Rico, and Canadian state highway and Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book.