Research in Progress (RIP) https://rip.trb.org/ en-us Copyright © 2026. National Academy of Sciences. All rights reserved. http://blogs.law.harvard.edu/tech/rss tris-trb@nas.edu (Bill McLeod) tris-trb@nas.edu (Bill McLeod) Research in Progress (RIP) https://rip.trb.org/Images/PageHeader-wTitle-RIP.jpg https://rip.trb.org/ Non-Nuclear Methods for Compaction Control of Unbound Soil and Granular Layers https://rip.trb.org/View/1530339 Mon, 06 Aug 2018 14:53:01 GMT https://rip.trb.org/View/1530339 Development of In-Place Density Method for Cold In-Place Recycling https://rip.trb.org/View/1403620 Wed, 13 Apr 2016 11:47:16 GMT https://rip.trb.org/View/1403620 Characterization and Modeling of Photon Absorption in Asphalt Materials for Improved Accuracy and Consistency of Nuclear Density Measurement https://rip.trb.org/View/1356625 Fri, 05 Jun 2015 01:00:49 GMT https://rip.trb.org/View/1356625