01757368

Monograph

http://www.trb.org/Main/Blurbs/181389.aspx

Pavement recycling offers economic and environmental benefits through reductions in material and energy consumption, cost of construction, and user delays. However, there are currently no universally agreed upon rapid process control and product acceptance test methods to ensure that the constructed materials comply with commonly specified parameters and are ready for traffic and surfacing. A standard practice for process control and product acceptance of cold recycling operations was needed to promote consistency among agencies. Appropriate time-critical field tests performed during construction are also needed to rapidly determine the quality of the as-constructed cold recycled pavement and evaluate its readiness for traffic and surfacing. In this project, the research team was tasked with developing rapid, time-critical tests for asphalt-treated cold in-place recycling (CIR), full-depth reclamation (FDR), and cold central-plant recycling (CCPR) materials that provide criteria for determining when the pavement can be opened to traffic and surfaced as well as a standard practice for using these tests for process control and product acceptance. The research was conducted in three phases. Phase I included a comprehensive literature review, a stakeholder survey, and a review of agency specifications. A few tests routinely used in the field were identified that could assess desired time-critical properties. Phase II was a series of laboratory experiments that evaluated several existing and newly developed tests for their ability to determine in the field when a pavement was ready to accept traffic or surfacing. Phase III assessed the most promising tests from Phase II in a field setting where the properties of cold recycled materials from 16 construction projects were measured in situ to determine the pavements’ readiness for traffic or surfacing. Finally, the most promising rapid test methods from the field experiment were incorporated in a proposed AASHTO standard practice that guides their use for making time-critical decisions regarding opening cold recycled pavements to traffic and surfacing. The key outcome of this research is the proposed AASHTO Standard Practice: Process Control and Product Acceptance of Asphalt-Treated Cold Recycled Pavements and its associated test methods. This practice is presented as Appendix B. Two new test methods developed in the project are presented in Appendices C and D.

Project 09-62

English

0000-0002-6216-3134

161p

2021

NCHRP Research Report

9780309673679

Digital/other

Appendices; Figures; Photos; References; Tables

Acceptance tests; Asphalt pavements; Asphalt tests; Cold in-place recycling; Field tests; Laboratory tests; Process control; Quality control; Test procedures

American Association of State Highway and Transportation Officials

Construction; Highways; Maintenance and Preservation; Materials; Pavements

TRIS, TRB, ATRI

Oct 28 2020 11:48AM