Annotated Literature Review for NCHRP Report 640 (2009) / Chapter Skim
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Pages 203-207
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201 1.50 Watson, D
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202 1.50.3 Materials and Design Watson et al indicate that three different types of aggregates and three different types of asphalt binder were used in this study. Samples were compacted with the SGC as well as the Marshall hammer.
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203 Table 102: Tests for Different Properties Property Standard Tests and Procedures Used in this Study Compaction Marshall – 25 and 50 blows; SGC – 30, 45 and 60 gyrations Aggregate Breakdown Extraction in ignition furnace (AASHTO TP 53-97, without calibration) and washed sieve analysis (AASHTO T 11-91)
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204 are equivalent to that of the 50 blow Marshall within a range of 45 to 53 gyrations. The gravel mix had a higher density with the 50 blow Marshall hammer than with the gyratory compactor.
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205 Watson et al mention that with Superpave gyratory compacted samples, all mixtures except traprock and gravel with the PG 64-22 binder met the requirements. All the gyratory samples with polymer-modified binder met the maximum stone loss requirements of 20 percent for unconditioned specimens and 30 percent for conditioned samples.
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