NCHRP Asphalt Research. April 2015
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1 NCHRP Asphalt Research April
2 WARM MIX ASPHALT 2
3 9-52: Short-Term Laboratory Conditioning of Asphalt Mixtures Short-term laboratory conditioning that simulates plant mixing and processing to the point of loading in the transport truck and the initial 3 years of field performance. When does WMA = HMA 0? 2-3 months. R 30 long-term procedure yields average 2 years aging. Significant factors affecting aging: binder source and aggregate absorption. Texas A&M Transportation Institute (August 2015) 3
4 9-53: Properties of Foamed Asphalt for Warm Mix Asphalt Applications Determined key properties of foamed asphalt binders that significantly influence the performance of asphalt mixtures: ER, k-value, FI, SAI. Mix design method determines optimum water content and checks workability (SGC) and coatability. Best coatability and workability at 1-2% water content in lab and field. NCHRP Report 807 anticipated June Texas A&M Transportation Institute (Completed) 4
5 9-54: Long-Term Aging of Asphalt Mixtures for Performance Testing and Prediction Laboratory procedure to simulate long-term aging of asphalt mixtures for performance testing and prediction. Experiment design correlates rheology and kinetics of binders aged in the laboratory and long term in the field, including ARC, MnRoad, FHWA-ALF, WesTrack, and LTPP SPS-1 and SPS-8 Preliminary results support 9-52 finding on R 30. North Carolina State University (May 2016) 5
6 9-55: Recycled Asphalt Shingles in Asphalt Mixtures with Warm Mix Asphalt Technologies Develop a design and evaluation procedure for acceptable performance of asphalt mixtures incorporating WMA technologies and RAS, with and without RAP, for project-specific service conditions. New field projects: WI, AL, TN completed. Existing field projects: IL (2), TX (2). National Center for Asphalt Technology (Sept 2016) 6
7 9-59: Relating Asphalt Binder Fatigue Properties to Asphalt Mixture Fatigue Performance Determine asphalt binder properties that are significant indicators of the fatigue performance of asphalt mixtures and validate them with field data. Identify or develop a practical, implementable binder test to measure properties that are significant indicators of mixture fatigue performance for use in a performance-related binder purchase specification. Advanced Asphalt Technologies, LLC 7
8 MATERIALS AND MIX DESIGN 8
9 1-55: Performance-Based Mix Design for Porous Friction Courses Based on use of SGC. Consider rutting, raveling, cracking, moisture susceptibility, permeability, noise reduction, and friction. Balance durability and functionality. National Center for Asphalt Technology (July 2016) 9
10 9-48: Field versus Laboratory Volumetrics and Mechanical Properties Determine sources of variability for volumetric and mechanical properties of asphalt mixtures among LMLC, PMLC, and PMFC specimens. Meta-analysis of literature data sets inconclusive. Significant differences in properties and predicted performance between PMFC and LMLC or PMLC. Key factors: baghouse fines, aggregate absorption and hardness, stockpile moisture. Louisiana Transportation Research Center (June 2015) 10
11 9-56: Minimizing the Variability of Ignition Furnace Correction Factors What factors affect the variability of asphalt and aggregate correction factors? Develop a correction factor verification procedure to troubleshoot non-comparing results of AASHTO T 308. National Center for Asphalt Technology (October 2016) 11
12 9-58: The Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios Evaluate the effectiveness of recycling agents in asphalt mixtures with high RAS, RAP, or combined RAS/RAP binder ratios. High binder ratios = 0.3 to 0.5. Laboratory and field experimental program. Texas A&M Transportation Institute (October 2017) 12
13 PAVEMENTS 13
14 1-54: Guidelines for Limiting Damage to Flexible and Composite Pavements Due to the Presence of Water For the practicing engineer. Considers pavement structure, roadway geometry, regional climate, materials, construction and maintenance practices. Applied Pavement Technology, Inc. (August 2016) 14
15 9-51: Material Properties of CIR and FDR Asphalt Concrete for Pavement Design Propose material properties, test methods, and distress models for including the performance of pavement layers prepared with CIR and FDR AC in Pavement ME Design. Evaluating materials and data from 19+ field projects in U.S. and Canada. University of Maryland (June 2015) 15
16 20-07/Task 339: Best Practices for Crack Sealing and Crack Filling of Asphalt Pavements Literature review and survey of agencies and industry. Describes current state of the art and state of the practice. Selected best practices. NCHRP Report 784. Dale S. Decker, LLC 16
17 FY 2016 PROJECTS 17
18 D-04: The Impacts on Pavement Performance of Changes in Asphalt Production ($1,000,000) D-08: Guide Specifications for Pavement Preservation Treatments: Chip Seals and Microsurfacing ($300,000) F-01: Triggers and Timings for the Placement of Pavement Preservation Treatments for Asphalt Pavements ($350,000) 18
19
20 Thanks! 20
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