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/ SPR-5033: Optimizing field compaction of granular materials: Research and guideline development https://rip.trb.org/View/2553994 Thu, 15 May 2025 16:03:34 GMT https://rip.trb.org/View/2553994 Permeability of Granular Materials, and Blended Salvaged Granular Materials https://rip.trb.org/View/2379666 Tue, 14 May 2024 14:44:48 GMT https://rip.trb.org/View/2379666 Evaluation of Granular Density and Moisture Testing https://rip.trb.org/View/1852212 Thu, 13 May 2021 08:53:43 GMT https://rip.trb.org/View/1852212 Evaluation of Density and Moisture Testing for Granular Materials https://rip.trb.org/View/1729554 Tue, 18 Aug 2020 19:02:39 GMT https://rip.trb.org/View/1729554 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 Low cost Granulation of Lignocellulosic Biomass https://rip.trb.org/View/1368003 Fri, 04 Sep 2015 09:20:22 GMT https://rip.trb.org/View/1368003 Performance of Buried Pipes with Flowable Fill and Granular Stone as Backfill Materials https://rip.trb.org/View/1230089 Thu, 03 Jan 2013 13:53:51 GMT https://rip.trb.org/View/1230089