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) https://rip.trb.org/Images/PageHeader-wTitle-RIP.jpg https://rip.trb.org/ https://rip.trb.org/View/2731921 Fri, 17 Jul 2026 13:20:05 GMT https://rip.trb.org/View/2731921 https://rip.trb.org/View/2716607 Thu, 18 Jun 2026 09:55:41 GMT https://rip.trb.org/View/2716607 https://rip.trb.org/View/2709431 Wed, 03 Jun 2026 13:33:47 GMT https://rip.trb.org/View/2709431 https://rip.trb.org/View/2696148 Mon, 27 Apr 2026 19:33:01 GMT https://rip.trb.org/View/2696148 https://rip.trb.org/View/2606528 Fri, 03 Oct 2025 10:09:28 GMT https://rip.trb.org/View/2606528 https://rip.trb.org/View/2601507 Thu, 18 Sep 2025 16:03:45 GMT https://rip.trb.org/View/2601507 https://rip.trb.org/View/2593186 Tue, 26 Aug 2025 12:32:40 GMT https://rip.trb.org/View/2593186 https://rip.trb.org/View/2582927 Tue, 05 Aug 2025 13:13:14 GMT https://rip.trb.org/View/2582927 https://rip.trb.org/View/2562264 100 ppm) and sulfates (>200 ppm) have been identified as indicatives of corrosive soil in Federal Highway Administration guidelines for mechanically stabilized earth walls. Chloride ions, which directly participate in the anodic reaction of corrosions, could be a major threat for bridges in Michigan due to the large amount of de-icing agent applied in snow season. (c) Moisture content. Moisture is necessary for corrosion. Therefore, highest level of corrosion is usually found in water table fluctuation zone. (d) Bacteria. Microbiologically Influenced Corrosion (MIC), an electrochemical corrosion affected by the presence of biological agents, can also severely degrade the steel surfaces. (e) Pile type and loading history. The material, dimension and loading history of the steel piles can have impact on their corrosion rate. (3) There is no widely accepted method to predict pile corrosion. Current single variable or multivariable regression models do not consider all factors listed above, and thus lack generalizability. More importantly, the corrosion environment in Michigan may require its unique regression model. With these unsolved issues, the threat of influencing factors cannot be ranked. (4) There is lack of accurate prediction of the remaining load-bearing capacity of corroded steel piles. While several methods (AISC, AISI-EWM, AISI-DSM, etc.) have been developed, the localized corrosion as well as stiffness change make their assumption invalid and cause conservative prediction of the remaining life. (5) Many retrofit or repair techniques have been implemented for strengthening the corroded steel piles, but a detailed cost-effectiveness analysis (CEA) for those techniques should be conducted to minimize future construction cost in Michigan. Based on the above discussion, it is essential to investigate the effect of various factors on corrosion rate of steel bridge piles and predict the remaining load-bearing capacity of corroded piles. Consequently, proper repair technique can be applied at appropriate time to maintain and prolong the service life of bridges in Michigan.]]> Fri, 06 Jun 2025 14:44:09 GMT https://rip.trb.org/View/2562264 https://rip.trb.org/View/2558382 Wed, 28 May 2025 14:10:26 GMT https://rip.trb.org/View/2558382 https://rip.trb.org/View/2558368 Mon, 26 May 2025 22:53:48 GMT https://rip.trb.org/View/2558368 https://rip.trb.org/View/2495001 Fri, 31 Jan 2025 16:36:28 GMT https://rip.trb.org/View/2495001 https://rip.trb.org/View/2495008 Sat, 25 Jan 2025 10:49:20 GMT https://rip.trb.org/View/2495008 https://rip.trb.org/View/2485225 Tue, 31 Dec 2024 11:09:54 GMT https://rip.trb.org/View/2485225 https://rip.trb.org/View/2479849 Wed, 18 Dec 2024 15:51:55 GMT https://rip.trb.org/View/2479849