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/ Use of “Plazrok” Aggregate to Produce Durable Grade 3.0 and 4.0 Concrete https://rip.trb.org/View/2652729 Tue, 13 Jan 2026 16:28:22 GMT https://rip.trb.org/View/2652729 Selecting Appropriate Mitigation Methods for Soil Slope Failures: A Safety and Equity-Centric Approach https://rip.trb.org/View/2628205 Fri, 21 Nov 2025 14:23:07 GMT https://rip.trb.org/View/2628205 A Photogrammetry-based Method to Determine Chip Seal Aggregate Embedment: A Feasibility Study https://rip.trb.org/View/2627511 Thu, 20 Nov 2025 16:29:52 GMT https://rip.trb.org/View/2627511 Enhancing the Reliability of Transportation Structures by Quantifying Strength Reduction Magnitude of Soils in Midwestern States https://rip.trb.org/View/2626785 Thu, 20 Nov 2025 16:18:13 GMT https://rip.trb.org/View/2626785 Development of Biochar Specification Criteria as Soil Amendment for Slopes, Conveyances and Stormwater Treatment Systems, Phase 2 https://rip.trb.org/View/2487020 Wed, 08 Oct 2025 10:11:57 GMT https://rip.trb.org/View/2487020 Investigate the Effects of Using of Reclaimed Asphalt Pavement (RAP) as Aggregate in Seal Coats https://rip.trb.org/View/2604526 Mon, 29 Sep 2025 16:22:29 GMT https://rip.trb.org/View/2604526 Correlation of Laboratory Three-Wheel Polisher Revolutions with Roadway Accumulated-Traffic to Evaluate Laboratory Polishing of Pavements https://rip.trb.org/View/2593938 Thu, 28 Aug 2025 11:32:33 GMT https://rip.trb.org/View/2593938 Requirements of Aggregate Materials as Subbase, Base, Surface, and Shoulder Courses https://rip.trb.org/View/2593918 Thu, 28 Aug 2025 09:46:23 GMT https://rip.trb.org/View/2593918 Conduct a Friction Testing Program, Data Analysis and Effectiveness of the NMDOT Open Grade Friction Course Program https://rip.trb.org/View/2582895 Tue, 05 Aug 2025 10:54:23 GMT https://rip.trb.org/View/2582895 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 Identification of Alternative Coarse and Fine Aggregates and Specifications for Evaluation https://rip.trb.org/View/2550944 Thu, 08 May 2025 11:15:14 GMT https://rip.trb.org/View/2550944 Development of Crushed Quarry Aggregate Surfacing Specifications https://rip.trb.org/View/2533742 Tue, 01 Apr 2025 08:39:01 GMT https://rip.trb.org/View/2533742 NEXTGEN Concrete - Tests of the Future: Shrinkage Phase II https://rip.trb.org/View/2529970 Fri, 28 Mar 2025 13:26:33 GMT https://rip.trb.org/View/2529970 Gravel Road Performance Enhancements – Phase II https://rip.trb.org/View/2507250 Mon, 10 Feb 2025 14:11:01 GMT https://rip.trb.org/View/2507250 Design of Surface Treatments with Reclaimed Asphalt Pavement Aggregates in Nevada (NDOT 778-24-803) https://rip.trb.org/View/2502110 Mon, 03 Feb 2025 12:42:56 GMT https://rip.trb.org/View/2502110