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/ Effect of Supplementary Cementitious Materials (SCMs) and waste products on Critical Chloride Threshold, CT, of Concrete https://rip.trb.org/View/2694441 Tue, 21 Apr 2026 13:35:39 GMT https://rip.trb.org/View/2694441 Design Guidance and Best Practices for the Use of Light Fill https://rip.trb.org/View/2487315 Fri, 18 Jul 2025 10:36:48 GMT https://rip.trb.org/View/2487315 Environmental Friendly Applications of Ground Tire Rubber (GTR) In Producing Concrete https://rip.trb.org/View/1948638 Fri, 06 May 2022 12:26:44 GMT https://rip.trb.org/View/1948638 Optimizing the Sustainability of Asphalt Pavements through Incorporating Crumb Rubber in High-Modulus Asphalt Concrete (HMAC) Mixtures in Louisiana https://rip.trb.org/View/1948607 Fri, 06 May 2022 11:52:11 GMT https://rip.trb.org/View/1948607 Optimal Design of Sustainable Asphalt Mixtures with RAP (3.6) https://rip.trb.org/View/1601904 Wed, 24 Apr 2019 20:52:56 GMT https://rip.trb.org/View/1601904 Performance Characteristics of Modern Recycled Asphalt Mixes in Missouri, Including Ground Tire Rubber, Recycled Roofing Shingles, and Rejuvenators https://rip.trb.org/View/1594494 Sat, 23 Mar 2019 12:51:13 GMT https://rip.trb.org/View/1594494 Asphalt Mixtures with Crumb Rubber Modifier for Longevity and Environment (2.1) https://rip.trb.org/View/1591025 Thu, 07 Mar 2019 15:00:16 GMT https://rip.trb.org/View/1591025 Evaluation of Asphalt Rubber and Reclaimed Tire Rubber in Chip Seal Applications https://rip.trb.org/View/1521615 Wed, 04 Jul 2018 20:05:14 GMT https://rip.trb.org/View/1521615 Producing Bio-Modified Rubber (BMT) Asphalt; A Sustainable and Bio-Based Alternative for Petroleum-Based Asphalt https://rip.trb.org/View/1442173 Sun, 08 Jan 2017 10:26:20 GMT https://rip.trb.org/View/1442173 Evaluation of Crumb Rubber Modification of Louisiana Mixtures https://rip.trb.org/View/1351393 Thu, 23 Apr 2015 01:00:27 GMT https://rip.trb.org/View/1351393 Producing a Sustainable and Bio-Based Alternative for Petroleum-Based Asphalt https://rip.trb.org/View/1334856 Wed, 10 Dec 2014 01:02:27 GMT https://rip.trb.org/View/1334856 Environmental Impacts and Energy Efficiency of Rubberized Warm Mix Asphalt (R-WMA) for Sustainable Road Construction https://rip.trb.org/View/1236251 Thu, 03 Jan 2013 15:43:44 GMT https://rip.trb.org/View/1236251