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/ Effects of Target Air Voids on Hot Mix Asphalt (HMA) Performance Tests https://rip.trb.org/View/2698280 Fri, 01 May 2026 09:19:25 GMT https://rip.trb.org/View/2698280 SPR-4951: Development of a Ground Penetrating Radar Based Testing Program for Mechanically Stabilized Earth Walls https://rip.trb.org/View/2553989 Thu, 15 May 2025 15:51:21 GMT https://rip.trb.org/View/2553989 Stabilizing Leaking Sand Behind MSE Walls https://rip.trb.org/View/2489964 Mon, 13 Jan 2025 14:59:11 GMT https://rip.trb.org/View/2489964 Corrosion Risk Assessment of Unbonded Post Tensioned Tendons Filled with flexible Filler That Have Voids With and Without Solutions https://rip.trb.org/View/2348632 Mon, 03 Jun 2024 14:52:19 GMT https://rip.trb.org/View/2348632 Effect of Vibration on Concrete Mixtures https://rip.trb.org/View/2342171 Tue, 20 Feb 2024 17:47:32 GMT https://rip.trb.org/View/2342171 SPR-4718: Influence of Nanomaterials‐based Admixtures on the Entrained Air Void System and Freeze‐Thaw (FT) Resistance of Concrete https://rip.trb.org/View/2083726 Tue, 13 Dec 2022 15:06:45 GMT https://rip.trb.org/View/2083726 Showcasing and Rodeo of Emerging Concrete Technologies at TFHRC https://rip.trb.org/View/2077946 Tue, 06 Dec 2022 09:48:39 GMT https://rip.trb.org/View/2077946 Enhancing the ABS ACOUSTIC BUBBLE SPECTROMETER® for Kansas https://rip.trb.org/View/2015224 Tue, 30 Aug 2022 17:20:10 GMT https://rip.trb.org/View/2015224 Evaluation of the Acoustic Bubble Spectrometer for Kansas Paving Mixtures https://rip.trb.org/View/1902214 Fri, 07 Jan 2022 12:31:47 GMT https://rip.trb.org/View/1902214 SPR-4620: Developing AI-assisted In-situ NDT Method for Air-Void Distribution Testing in Fresh and Hardened Concrete https://rip.trb.org/View/1879917 Thu, 23 Sep 2021 15:13:51 GMT https://rip.trb.org/View/1879917 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 Integrating Construction Practices and Weather Into Freeze Thaw Specifications https://rip.trb.org/View/1689414 Tue, 25 Feb 2020 21:08:19 GMT https://rip.trb.org/View/1689414 SPR-4415: Determining Asphalt Mixture Properties Using Imaging Techniques https://rip.trb.org/View/1665586 Thu, 07 Nov 2019 16:37:57 GMT https://rip.trb.org/View/1665586 Annulus Void Fill Material for Rehabilitated Sliplined Culverts https://rip.trb.org/View/1664486 Tue, 05 Nov 2019 11:43:08 GMT https://rip.trb.org/View/1664486 Understanding Air Content Measurement Techniques for Durability Prediction https://rip.trb.org/View/1604438 Tue, 07 May 2019 15:22:54 GMT https://rip.trb.org/View/1604438