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/ RES2020-09: Enhancing freeze-thaw resistance of Tennessee concrete mixes through improved air void testing https://rip.trb.org/View/1716726 Fri, 26 Jun 2020 16:08:41 GMT https://rip.trb.org/View/1716726 Guidelines for Limiting Damage to Flexible and Composite Pavements Due to the Presence of Water https://rip.trb.org/View/1331750 Thu, 20 Nov 2014 01:04:24 GMT https://rip.trb.org/View/1331750 An Asset Management Approach for Drainage Infrastructures & Culverts https://rip.trb.org/View/1228645 Thu, 03 Jan 2013 13:24:51 GMT https://rip.trb.org/View/1228645