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/ Parametric Analysis of the Durability and Chloride Penetrability of Fiber Reinforced Concrete Bridge Decks https://rip.trb.org/View/2265651 Tue, 10 Oct 2023 12:03:24 GMT https://rip.trb.org/View/2265651 Corrosion Performance Overview of Existing Concrete Reinforcement Options https://rip.trb.org/View/2244516 Thu, 14 Sep 2023 08:49:32 GMT https://rip.trb.org/View/2244516 SPR-4808: Reducing the Dependency on Chlorides & Impacts https://rip.trb.org/View/2232769 Thu, 24 Aug 2023 15:06:57 GMT https://rip.trb.org/View/2232769 Life-cycle fire performance assessment and enhancement of reinforced concrete bridges in chloride-laden environments https://rip.trb.org/View/2232153 Wed, 23 Aug 2023 21:06:09 GMT https://rip.trb.org/View/2232153 Best Management Practices for Liquid Chloride Storage and Pumping Systems https://rip.trb.org/View/2209750 Tue, 11 Jul 2023 10:37:19 GMT https://rip.trb.org/View/2209750 Synthesis of Information Related to Highway Practices. Topic 55-01. State DOT Policies and Practices on the Use of Corrosion Resistant Reinforcing Bars https://rip.trb.org/View/2190455 Tue, 06 Jun 2023 17:02:42 GMT https://rip.trb.org/View/2190455 Protective Performance of Externally-Bonded, Nano-Modified FRP for Concrete https://rip.trb.org/View/2021307 Fri, 09 Sep 2022 17:51:49 GMT https://rip.trb.org/View/2021307 CCTRP 20-03: Protection Against Corrosion of Steel in Concrete Using Epoxy/LDH Coatings https://rip.trb.org/View/2007950 Mon, 15 Aug 2022 13:03:45 GMT https://rip.trb.org/View/2007950 NEXTGEN Concrete - Tests of the Future: Chloride and Sulfate Durability https://rip.trb.org/View/1982051 Wed, 15 Jun 2022 09:37:12 GMT https://rip.trb.org/View/1982051 Smart Chloride Mitigation System https://rip.trb.org/View/1895369 Fri, 03 Dec 2021 13:14:43 GMT https://rip.trb.org/View/1895369 Durability of Transverse Sawcut Joints (Year 2) https://rip.trb.org/View/1862869 Thu, 01 Jul 2021 17:01:12 GMT https://rip.trb.org/View/1862869 Catalyst Regeneration of RAP-Binder in Asphalt https://rip.trb.org/View/1751141 25%) with virgin materials. This is a potential issue because the increasing percentage may adversely affect the performance of asphalt pavements, eventually resulting in higher pavement maintenance and rehabilitation costs. RAP-binders are difficult to reuse because they often contain associated molecules with very high molecular weights. Due to the polarity gained during oxidative aging, the asphaltene-type molecules form associated structures. These high molecular weight components are responsible for RAP-binder’s increased viscosity and certain deteriorated rheological properties. As a remedy, rejuvenators, softening agents, softer binders, and antioxidants can be added to asphalt that contains high amounts of RAP-binder to rebalance their rheological properties. Another approach to increase the amount of RAP-binder would be to modify the binder’s chemical composition with the help of a reagent or catalyst. Catalysts have been already positively impacting our lives with clean energy and green chemistry. This proposal will study effective ways to incorporate a high amount (> 25%) of RAP content in asphalt mixtures using a novel approach of introducing a catalyst that can disrupt the associated molecules formed during aging. The use of a catalyst such as a Lewis acid to break the associated molecules in the RAP-binder is a new promising approach. The project will investigate the effect of a Lewis acid catalyst such as Iron (III) chloride and Zinc chloride on the chemical composition of RAP-binder. These catalysts are known to catalyze the conversion of coal to liquid product, but the mechanism of action is not well understood. A detailed study of the chemical changes that occur to the RAP-binder before and after the modification will be carried out. The various virgin binder and RAP-binder blends with catalyst will be subjected to extensive chemical characterizations. This research is anticipated to facilitate the use of higher RAP contents in road construction. The outcomes of this study reduce the cost of highway construction and develop more environmentally friendly practices.]]> Tue, 10 Nov 2020 16:26:11 GMT https://rip.trb.org/View/1751141 Investigation into the Contributing Factors to the Corrosion of Steel Reinforced Concrete Structures at Elevations Greater than 12 Feet Above the mean High Water Line https://rip.trb.org/View/1688016 Thu, 20 Feb 2020 14:24:03 GMT https://rip.trb.org/View/1688016 Impact of Sulfate Ion and Soft Grout on Post-Tensioned Concrete Bridges https://rip.trb.org/View/1512674 Wed, 16 May 2018 09:20:09 GMT https://rip.trb.org/View/1512674 Assessing the Impact of the ODOT Winter Salt Pilot Project on Neighboring Streams and Groundwater https://rip.trb.org/View/1500692 Thu, 01 Feb 2018 16:36:05 GMT https://rip.trb.org/View/1500692