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/ Develop a Balanced Asphalt Mixture Design Procedure https://rip.trb.org/View/2582880 Tue, 05 Aug 2025 10:34:41 GMT https://rip.trb.org/View/2582880 SPR-4909: Evaluation of Superpave 5 Asphalt Mixtures with Volume of Effective Binder Specification Changes https://rip.trb.org/View/2464525 Tue, 26 Nov 2024 16:06:37 GMT https://rip.trb.org/View/2464525 Evaluation of Superpave, Superpave 5, and Stone Matrix Asphalt https://rip.trb.org/View/2140132 Tue, 21 Mar 2023 10:30:52 GMT https://rip.trb.org/View/2140132 Development of a Refined Superpave Binder Purchase Specification https://rip.trb.org/View/2085721 Fri, 16 Dec 2022 14:15:16 GMT https://rip.trb.org/View/2085721 SPR-4514: Material Characterization and Determination of MEPDG Input Parameters for Indiana Superpave 5 Asphalt Mixtures https://rip.trb.org/View/1724641 Wed, 29 Jul 2020 11:30:22 GMT https://rip.trb.org/View/1724641 NCHRP Implementation Support Program. Facilitating Balanced Mix Design Implementation https://rip.trb.org/View/1695723 Mon, 30 Mar 2020 17:03:35 GMT https://rip.trb.org/View/1695723 SPR-4211: Implementing the Superpave 5 Asphalt Mixture Design Method and Refining the INDOT Ndesign Table, Lift Thickness and Mixture Compactability https://rip.trb.org/View/1494140 Thu, 04 Jan 2018 10:17:03 GMT https://rip.trb.org/View/1494140 Research for AASHTO Standing Committee on Highways. Task 412. Adjustments to the Superpave Volumetric Mixture Design Procedure for Selecting Optimum Asphalt Content https://rip.trb.org/View/1491277 Mon, 11 Dec 2017 20:09:59 GMT https://rip.trb.org/View/1491277 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 PPRC14 SPE 3.32: Support for Superpave Implementation https://rip.trb.org/View/1441810 Wed, 04 Jan 2017 10:53:10 GMT https://rip.trb.org/View/1441810 SPR-4152: Pavement Density Demonstration Project https://rip.trb.org/View/1435496 Tue, 22 Nov 2016 15:56:51 GMT https://rip.trb.org/View/1435496 Performance of Unbound Layers of a Flexible Pavement System During Aircraft Loading https://rip.trb.org/View/1360993 Wed, 15 Jul 2015 01:01:33 GMT https://rip.trb.org/View/1360993 Evaluation of Modified Performance Grade Binders in Thin Lift Maintenance Mixes, Surface Mix, and a Reflective Crack Relief Layer Mix https://rip.trb.org/View/1358414 Mon, 22 Jun 2015 01:01:00 GMT https://rip.trb.org/View/1358414 Implementation of the Asphalt Mixture Performance Tester (AMPT) for Superpave Validation https://rip.trb.org/View/1358413 Mon, 22 Jun 2015 01:00:58 GMT https://rip.trb.org/View/1358413 Superpave Regional Center, Southeastern Region https://rip.trb.org/View/1358405 Mon, 22 Jun 2015 01:00:46 GMT https://rip.trb.org/View/1358405