This laboratory study compared several methods of selecting the optimum asphalt content of surface mixes. Six surface mixes were tested using the 50-blow Marshall design, the 75-blow Marshall design, two brands of SHRP gyratory compactors, and the U.S. Army Corps of Engineers' gyratory testing machine (GTM) with the oil-filled and the air-filled rollers. The Georgia loaded wheel tester (GLWT) was also used in an attempt to define the maximum allowable asphalt content. The GTM with the air-filled roller and the 75-blow Marshall design produced the largest differences in optimum asphalt content. The two SHRP gyratory compactors gave comparable contents. The lack of rutting with the GLWT at a high asphalt content prevented determining the maximum allowable asphalt content and fulfilling the primary purpose of the study. However, other findings were of interest.
This project assessed the suitability of Wisconsin’s asphalt binder modification guidelines. It follows up on a previous Wisconsin Highway Research ...
State of Alaska State of Alaska - Warm Mix Project Warm Mix Project: Location Location - Petersburg, Alaska which is Petersburg, Alaska which is locat...
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