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原文传递 Design and Construction Recommendations for Thin Overlays in Texas.

题名：	Design and Construction Recommendations for Thin Overlays in Texas.
作者：	Estakhri, C.; Scullion, T.; Wilson, B.
关键词：	Construction; Cost Effectiveness; Cracking(fracturing); Design; Hot Mix Asphalts; Laboratory Tests; Microsurfaces; Noise; Pavement Overlays; Permeability; Rutting; Skid Resistance; Slurries; Specifica
摘要：	Thin HMA overlays, laid at 1.0 inch or thinner, are cost-effective surface maintenance options. The primary focus of this research was to develop specifications for three such mixes: fine dense-graded mix (fine DGM), fine-graded stone matrix asphalt (fine SMA), and fine-graded permeable friction course (fine PFC). A number of slurry overlay systems were also evaluated, but to a lesser extent. Draft specifications for the three mix types were first developed based on the results of a literature/information search and a field investigation of 11 existing projects. The specifications included minimum material quality levels, laboratory performance criteria, and construction recommendations. To evaluate the design recommendations, extensive laboratory testing was performed on each of the three thin overlay mixes with five different aggregates. Of the 15 mixes attempted, 12 had acceptable designs in terms of the specified performance tests. For the most part, the draft specifications appeared to function well with minor alterations recommended. Testing also included two supplementary studies on the effects of screening type in fine SMA and the effects of recycled materials on both the fine SMA and fine PFC. Compaction of the fine SMAs was highly influenced by packing characteristics of the coarse and fine aggregates. Screening quality did not affect fine SMA rutting resistance, but did affect cracking resistance. Using recycled aggregates reduced rutting problems but increased cracking susceptibility; however, most mixes performed well suggesting that quality, well-engineered mixes can still have good performance when recycled materials are used in limited amounts. Concerning laboratory testing of slurry overlays, the applicability of the overlay tester/procedures and the three-wheel polishing device in testing should be further studied. In particular, a tie-in with actual field performance should be identified, perhaps with the Accelerated Pavement Test program. Six thi
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