01593276

Component

https://doi.org/10.3141/2575-14

Using reclaimed and recycled materials in asphalt mixtures is one of the most commonly used sustainable strategies, which results in cost savings and environmental benefits because they replace virgin materials. Commonly used recycled, reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS) can pose challenges because their inclusion in the asphalt mixture may adversely affect pavement performance. This paper presents the recently developed fracture testing method, the Illinois semicircular bending (IL-SCB) fracture geometry at 25°C with a displacement rate of 50 mm/min. The flexibility index (FI), derived from the IL-SCB test results, was introduced to rank the potential cracking resistance of mixes. The developed testing protocol provides a practical and reliable approach to screen the capacity of mixes to resist cracking. An application of the IL-SCB test method and FI is presented using laboratory-prepared and compacted mixes with varying proportions of RAP and RAS. The mixes were designed and prepared with strict volumetric requirements, enabling comparison of the effects of RAP and RAS only. Fracture testing was conducted at low and intermediate temperatures. Fracture testing results indicate a consistent trend at intermediate temperatures using both fracture energy and the FI. The discrimination potential and sensitivity of the FI to even small changes in the mix design properties enable integration of the IL-SCB test method and FI as a performance quality indicator. Finally, the FI and Hamburg wheel-tracking test results are combined in an interaction plot that can be used as a performance-based mix design tool along with volumetrics requirements.

01595163

16-6872

English

0000-0001-6180-9602

pp 130–137

2016

Transportation Research Record: Journal of the Transportation Research Board

9780309370042

Print

Figures (7) ; Photos; References (14) ; Tables (2)

Asphalt mixtures; Cracking; Flexibility; Mix design; Reclaimed asphalt pavements; Shingles

Performance based design; Semicircular bending test; Test protocols; Wheel tracking tests

Illinois

Highways; Materials; Pavements

PRP, TRIS, TRB, ATRI

Jan 12 2016 6:59PM

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• Performance of a Highly Polymer-Modified Asphalt Binder Test Section at the National Center for Asphalt Technology Pavement Test Track
• Performance of Fiber-Reinforced Polymer-Modified Asphalt: Two-Year Review in Northern Arizona
• Proposed Approach for Evaluation of Cohesive and Adhesive Properties of Asphalt Mixtures for Determination of Moisture Sensitivity
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• Warm-Mix Asphalt Moisture Susceptibility Evaluation for Mix Design and Quality Assurance
• Warm-Mix Asphalt Trials in New York State: Laboratory and Field Performance
• Weibull Model for Rutting Prediction of Warm-Mix Asphalt Agents: Using Hamburg Wheel-Tracking Device Results