Evaluation of Revised Incentive-Only Ride Specification for Asphalt Pavements

Evaluation of Revised Incentive-Only Ride Specification for Asphalt Pavements
Author: Harikrishnan Nair
Publisher:
Total Pages: 22
Release: 2018
Genre: Pavements, Asphalt
ISBN:

In late 2011, the executive leadership of the Virginia Department of Transportation (VDOT) formed an Asphalt Quality Task Force to identify and recommend specific achievable measures to improve the quality of asphalt paving in Virginia. The task force recommended that VDOT assess the feasibility of making an incentive-only provision for ride quality the default for projects that do not qualify for VDOT’s regular specification for rideability, which includes both incentives and disincentives. A pilot application of the incentive-only provision was conducted during VDOT’s 2013 construction season. Although the results indicated no statistically reliable distinction in ride quality between the projects under the incentive-only provision and those with no rideability requirement, the number of sites, VDOT districts, contractors, etc., included in the assessment was limited. The research summarized through this study addressed a concern that the criteria for the ride specification in the original (2013) incentive-only provision may have failed to reflect quality adequately beyond a limited 52.8 ft (0.01-mi) base length. The study documented the application of an incentive-only provision to a wider range of projects during VDOT’s 2015 construction season. The revised criteria addressed some of the concerns associated with the original criteria. The revised provision maintains the potential for incentives while reducing the likelihood for “accidental” bonuses when the final ride quality is marginal on average but highly variable. Overall, there remains little statistically reliable distinction between the achieved ride quality of projects under the incentive-only provision and of general resurfacing projects with no ride quality requirement. However, based on before and after determinations of the International Roughness Index, greater improvements in ride quality were achieved with the incentive-only pilots (at least in some cases) as compared to sites under no ride quality requirement. The revised incentive-only provision provides a mechanism through which a contractor has an opportunity to recover costs associated with improved practices and perhaps even earn incentives based on good ride quality. It does this while reducing the risk that VDOT will be subject to incentives for otherwise marginal quality work. The study recommends that VDOT continue to promote and administer an incentive-only provision for qualifying resurfacing activities in accordance with the criteria recommended in this study. However, VDOT should continue to monitor the data from projects under the incentive-only provision and assess the effectiveness and benefit of the revised provision, provided in the Appendix, once it is applied on a larger basis.

Assessment of an Incentive-Only Ride Specification for Asphalt Pavements

Assessment of an Incentive-Only Ride Specification for Asphalt Pavements
Author:
Publisher:
Total Pages: 45
Release: 2015
Genre: Contractors--Roads--Design and construction
ISBN:

Smoothness specifications are applied by almost all state transportation agencies, including the Virginia Department of Transportation (VDOT), to promote the overall quality and optimum ride quality of pavements. VDOT has a ride specification that provides a pay adjustment (either incentive or disincentive) depending on the smoothness of the final paved surface. VDOTs ride specification also has a provision to waive the disincentive and apply the incentive part only to projects where project geometry, etc., is perceived to make it difficult for the contractor to achieve the desired ride. When applied, the waiver is intended to encourage the contractor to apply additional efforts to improve the ride for otherwise difficult projects. In late 2011, VDOTs executive leadership formed an Asphalt Quality Task Force to identify and recommend specific achievable measures to improve the quality of the asphalt paving in Virginia. The task force agreed to consider the proposal to make an incentive-only provision the default for projects that would otherwise not qualify for the regular ride specification application. This study documented and critically reviewed the pilot application of the incentive-only provision for rideability on selected asphalt resurfacing schedules for VDOTs 2013 construction season. Several lane-miles of control sites were compared with the incentive-only sites to determine if the prospects of added incentives led contractors to alter their paving procedures in pursuit of a higher quality ride. There was no statistically reliable distinction between the achieved quality of the incentive-only and control sites. Further, it was found that the originally proposed incentive-only provisions did not provide any meaningful benefit to VDOT or contractors. The study developed a revised incentive-only specification and further recommended that the proposed provision be applied to a wider range of projects in VDOTs 2015 construction season.

Evaluation of Pavement Friction Characteristics

Evaluation of Pavement Friction Characteristics
Author: John Jewett Henry
Publisher: Transportation Research Board
Total Pages: 76
Release: 2000
Genre: Technology & Engineering
ISBN: 9780309068741

This synthesis report will be of interest to pavement design, construction, management, and research engineers, highway safety officials, and others concerned with pavement friction characteristics. It describes the current state of the practice and discusses the methods used for evaluating wet pavement friction characteristics of new and restored pavements. This synthesis reviews models used for measuring and evaluating friction and texture, causes for friction changes over time, and aggregate and mix design to provide adequate friction. Also presented are construction and surface restoration practices for providing good pavement surface characteristics. In addition, considerations of noise and ride quality are discussed when compromise may be required.

AASHTO Guide for Design of Pavement Structures, 1993

AASHTO Guide for Design of Pavement Structures, 1993
Author: American Association of State Highway and Transportation Officials
Publisher: AASHTO
Total Pages: 622
Release: 1993
Genre: Pavements
ISBN: 1560510552

Design related project level pavement management - Economic evaluation of alternative pavement design strategies - Reliability / - Pavement design procedures for new construction or reconstruction : Design requirements - Highway pavement structural design - Low-volume road design / - Pavement design procedures for rehabilitation of existing pavements : Rehabilitation concepts - Guides for field data collection - Rehabilitation methods other than overlay - Rehabilitation methods with overlays / - Mechanistic-empirical design procedures.