Research in Progress (RIP) https://rip.trb.org/ en-us Copyright © 2024. 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/ Implementing the LWD for MoDOT Construction Acceptance of Unbound Material Layers: Phase II https://rip.trb.org/View/2289620 Tue, 14 Nov 2023 20:28:42 GMT https://rip.trb.org/View/2289620 Measurement of cement content and layer thickness variation of cement stabilized base and subgrade using ground penetrating radar https://rip.trb.org/View/2269988 Tue, 17 Oct 2023 11:55:09 GMT https://rip.trb.org/View/2269988 Field Evaluation of Geogrid-reinforced Pavement Systems on Soft Subgrades https://rip.trb.org/View/2265761 Wed, 11 Oct 2023 16:29:01 GMT https://rip.trb.org/View/2265761 Evaluation of Portland Limestone Cement-Treated Subgrade Soils and Bases in Kansas https://rip.trb.org/View/2255786 Tue, 26 Sep 2023 17:47:15 GMT https://rip.trb.org/View/2255786 Understanding Causes of Concrete Culvert Pipe Joint Separation https://rip.trb.org/View/2244263 Tue, 12 Sep 2023 12:02:44 GMT https://rip.trb.org/View/2244263 SPR-4827: Develop a Performance-Related QA Testing Method for Accepting MSE Wall Coarse Aggregate Reinforced Backfill Compaction Acceptance https://rip.trb.org/View/2238846 Thu, 31 Aug 2023 16:44:56 GMT https://rip.trb.org/View/2238846 Evaluation of Backfill Aggregate Properties https://rip.trb.org/View/2233694 Fri, 25 Aug 2023 12:45:19 GMT https://rip.trb.org/View/2233694 Evaluation of Downdrag Loads on Bridge Pile Foundations in Inundated Collapsible Soils https://rip.trb.org/View/2166088 Mon, 01 May 2023 09:28:46 GMT https://rip.trb.org/View/2166088 Lightweight Deflectometer (LWD) Assessment for Quality Assurance https://rip.trb.org/View/2151380 Wed, 12 Apr 2023 19:38:51 GMT https://rip.trb.org/View/2151380 Durability of recycled materials used as backfills https://rip.trb.org/View/2067985 Mon, 21 Nov 2022 16:26:24 GMT https://rip.trb.org/View/2067985 Settlement Criteria and Design Approach for Embankments and Retaining Walls Built on Compressible Soils https://rip.trb.org/View/2056306 Thu, 03 Nov 2022 17:29:02 GMT https://rip.trb.org/View/2056306 Design Resilient Modulus for Coarse-Grained Subgrade Soils https://rip.trb.org/View/2050261 10,000) projects as an alternative to actual MR testing. However, no statewide average MR values or correlations are currently available for coarse-grained soils (A-1, A-2 and A-3). Although some actual measured values are available, it has also been noted from the data that MR of coarse-grained soil is measured significantly lower than AASHTO recommended MR values (MEPDG default) which needs to be further investigated. The objectives of the proposed project are to develop recommended MR values for local coarse-grained subgrade soils and to establish correlations (if available) with other simple conventional soil tests to estimate MR values for coarse-grained subgrade soils that can be used when necessary. The findings from this study are expected to facilitate proper pavement design for Virginia roadways and help in VDOT’s efforts in implementing MEPDG. ]]> Tue, 25 Oct 2022 09:55:46 GMT https://rip.trb.org/View/2050261 Standardizing Rigid Inclusions for Transportation Projects – Phase I https://rip.trb.org/View/2047342 Tue, 18 Oct 2022 17:06:18 GMT https://rip.trb.org/View/2047342 SPR-4714: Use of Machine Learning Methods to Obtain a Reliable Predictive Model for Resilient Modulus of Subgrade Soil https://rip.trb.org/View/2012428 Wed, 24 Aug 2022 16:04:27 GMT https://rip.trb.org/View/2012428 SPR-4724: Detection and Assessment of Sulfates in the Pavement Subgrade https://rip.trb.org/View/1998991 Tue, 26 Jul 2022 13:53:48 GMT https://rip.trb.org/View/1998991