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Evaluation of Reflective Cracking Mitigation Treatments Using the Composite Specimen Interface Crack (CSIC) Test.
| 题名： | Evaluation of Reflective Cracking Mitigation Treatments Using the Composite Specimen Interface Crack (CSIC) Test. |
| 作者： | Roque, R.; Cocconcelli, C.; Zou, J.; Park, B.; Lopp, G. |
| 关键词： | Fracture tolerance, Shear resistance, Interlayer mixture, Reflective cracking, Instability rutting |
| 摘要： | Reflective cracking is frequently reported as the most common distress affecting resurfaced pavements. The Florida Department of Transportation (FDOT) has traditionally used an asphalt rubber membrane interlayer (ARMI) approach to mitigate reflective cracking. However, recent field evidence has raised doubts about the effectiveness of the ARMI when placed near the surface, indicating questionable benefits to reflective cracking and increased instability rutting potential. The main purpose of this research was to develop guidelines for an effective alternative to the ARMI that is less expensive than a geotextile system for mitigation of near-surface reflective cracking in overlays on asphalt pavement. Fourteen interlayer mixtures, covering a broad range of gradation, were designed based on the dominant aggregate size range – interstitial component (DASR-IC) model, which provides a framework for the design and modification of gradation to ensure sufficient aggregate interlock to resist permanent deformation as well as adequate cracking resistance. A composite specimen interface cracking (CSIC) test developed in an earlier FDOT research project was enhanced with a new loading device, specimen preparation procedure, and loading procedure to more consistently evaluate reflective cracking performance of interlayer systems. In addition, asphalt pavement analyzer (APA) tests were performed to determine whether the interlayer mixtures had sufficient rutting resistance. The results demonstrated that interlayer mixtures designed with lower compaction effort, reduced design air voids, and coarser gradation led to more cost-effective fracture-tolerant and shear resistant (FTSR) interlayers. Therefore, preliminary design guidelines including minimum effective film thickness (EFT) requirements (20 ?m for 4.75-mm NMAS and 35 ?m for 9.5-mm NMAS FTSR mixtures) were proposed to mitigate near-surface reflective cracking. |
| 报告类型： | 科技报告 |
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