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Improving Fracture Resistance Measurements in Asphalt Binder Specifications with Verification on Asphalt Mixture Cracking Performance, Project Summary.
| 题名： | Improving Fracture Resistance Measurements in Asphalt Binder Specifications with Verification on Asphalt Mixture Cracking Performance, Project Summary. |
| 作者： | Karki, P.; Zhou, F. |
| 关键词： | Asphalt binder, Performance-Grade (PG), Asphalt pavement, Polyphosphoric Acid PPA), Performance, Cracking, Fatigue, Selection, Rutting, Durability, Strategic Highway Research Program (SHRP 2), Requirements analysis |
| 摘要： | The current performance-grade (PG) specification for asphalt binders was developed 25 years ago during the Strategic Highway Research Program. Over the years, many changes have occurred. Although asphalt binders produced still meet the requirements of the PG specification, many state departments of transportation are increasingly experiencing premature failures of pavements. These failures can be associated with many changes the asphalt pavement industry has experienced, which include crude oil sources, improved refinery technologies to extract more saturates from crude oil before producing asphalt binders, new techniques to engineer asphalt binders (such as the use of re-refined engine oil bottoms [REOB] and polyphosphoric acid [PPA]), new additives, and increased use of reclaimed materials (such as ground tire rubber, reclaimed asphalt pavements, and recycled roof shingles in asphalt pavement construction). All these changes make the asphalt binders very complex. Consequently, asphalt binders with the same PG may perform completely differently. To verify laboratory findings, many field test sections were constructed under the previous Project 0-6674 to validate the good performance of soft but highly modified asphalt binders. |
| 报告类型： | 科技报告 |
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