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/ Idaho-Specific Correlation of Dynamic Cone Penetrometer (DCP) to Resilient Modulus (Mr) https://rip.trb.org/View/2601427 Wed, 17 Sep 2025 16:28:03 GMT https://rip.trb.org/View/2601427 Improve Modulus Determination Using Falling Weight Deflectometer https://rip.trb.org/View/2553185 Wed, 14 May 2025 10:13:41 GMT https://rip.trb.org/View/2553185 SPR-4919: Develop Resilient Modulus Percent Within Limits (PWL) Values for Specifying Pavement Subgrade Construction in Performance-Based Specifications https://rip.trb.org/View/2434095 Wed, 25 Sep 2024 09:10:17 GMT https://rip.trb.org/View/2434095 Implementation and Performance Monitoring of Accelerating Mix Designs for Cement Treated Base https://rip.trb.org/View/2420071 Thu, 22 Aug 2024 16:10:17 GMT https://rip.trb.org/View/2420071 Perform Tests on LTS and Fine-Grain Soils and Evaluate CSM Base Layer IDT Gradient https://rip.trb.org/View/2262762 Fri, 06 Oct 2023 10:42:23 GMT https://rip.trb.org/View/2262762 SPR-4723: Investigate Resilient Modulus Improvements to Bases and Subgrades from Geosynthetic Reinforcement https://rip.trb.org/View/2012430 Wed, 24 Aug 2022 16:07:13 GMT https://rip.trb.org/View/2012430 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-4547: Data Interpretation of Automated Plate Load Test (APLT) for Realtime, In Situ Determination of Unbound Layer Resilient Modulus https://rip.trb.org/View/1768681 Tue, 09 Feb 2021 14:21:31 GMT https://rip.trb.org/View/1768681 SPR-4334: Improved Reliability of FWD Tests Results and Correlation with Resilient Modulus https://rip.trb.org/View/1563541 Tue, 16 Oct 2018 11:27:06 GMT https://rip.trb.org/View/1563541 Establishing a Correlation between Resilient Modulus and CBR/Soil Index Properties and Development of a Performance-Based Specification for Pavement Subgrade Materials https://rip.trb.org/View/1522887 Mon, 09 Jul 2018 16:08:09 GMT https://rip.trb.org/View/1522887 SPR-4230: Alternative Quality Assurance Methods for Compacted Subgrade https://rip.trb.org/View/1502463 Mon, 19 Feb 2018 16:47:50 GMT https://rip.trb.org/View/1502463 In Situ Modulus Measurement Using Automated Plate Load Testing for Statewide Mechanistic-Empirical Design Calibration https://rip.trb.org/View/1485618 Mon, 16 Oct 2017 15:13:07 GMT https://rip.trb.org/View/1485618 Resilient Modulus Prediction Models of Unbound Materials for Nevada https://rip.trb.org/View/1403618 Wed, 13 Apr 2016 11:27:34 GMT https://rip.trb.org/View/1403618