Comparison of Laboratory Fatigue Characteristics with Full-Scale Pavement Cracking for Recycled and Warm-Mix Asphalts. Issue 1 (2016)

• Record Type: Journal Article
• Authors: Li, Xinjun; Gibson, Nelson
• Is Part Of: Transportation research record. Volume 2576:Issue 1(2016)
• Page Start: 100
• Page End: 108
• Publication Date: 2016
• Subjects: Transportation -- Periodicals; Roads; Transport -- Périodiques; Routes -- Périodiques; Routes -- Conception et construction -- Périodiques; Roads; Transportation; 388.05
• DOI: 10.3141/2576-11
• Languages: English
• ISSNs: 0361-1981

Abstract

This paper presents the results of laboratory fatigue characterization of recycled and warm-mix asphalt (WMA), which include unaged and long-term oven-aged conditions tested with an asphalt mixture performance tester. Various choices of failure criteria and pavement structural variations were considered. The laboratory results were compared with full-scale performance data. A softer performance grade (PG) was effective at improving the performance for 40% reclaimed asphalt pavement (RAP) recycled binder ratio (RBR) mixes. The softer PG was ineffective at improving the performance of tear-off recycled asphalt shingles, providing 20% RBR. WMA production improved slightly in the 20% RAP RBR mixes, but was less effective in softening the 40% RAP RBR mixes. Long-term aging increased the modulus by about 24% and decreased the fatigue resistance by about 40%. Aged mixes appear to agree better with full-scale accelerated loading facility cracking. Structural differences from ordinary construction variation and the choice of failure criterion can trigger a couple of mixtures to change ranking in predicted fatigue cracking, but the overall rank order of the whole data set is fairly consistent.