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    <title>Transport Research International Documentation (TRID)</title>
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    <atom:link href="https://trid.trb.org/Record/RSS?s=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" rel="self" type="application/rss+xml" />
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Transport Research International Documentation (TRID)</title>
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    <item>
      <title>Entire Interior Culvert Lining with Engineered Cementitious Composites</title>
      <link>https://trid.trb.org/View/2712609</link>
      <description><![CDATA[Corrugated metal pipes make up a significant portion of Virginia’s culvert inventory and are prone to deterioration from corrosion and abrasion, particularly at the invert. In early stages, invert rehabilitation techniques such as invert paving are sufficient. However, at advanced stages of distress, full interior repair becomes necessary. In such cases, spray-applied pipe lining offers a cost-effective alternative. For spray-applied pipe lining, achieving adequate fresh-state workability of the cementitious lining material is critical to ensure pumpability and sprayability while allowing the material to build the required thickness without slumping. Previous research developed engineered cementitious composites (ECCs) for invert repair, but these mixtures required a biaxial geogrid for stability and were not optimized for full interior lining. This study builds on prior work by evaluating ECCs as a trenchless rehabilitation solution for the entire interior culvert lining. Sprayable ECC mixtures were developed and tested in the laboratory using readily available materials, moderate fiber contents, and simplified compositions—including coal ash-based and slag cement-based systems—to enhance field practicality. In addition, a parametric study assessed existing liner thickness design methodologies, and field inspections were conducted to evaluate the performance of conventional cementitious liners and ECC-repaired culvert inverts. Laboratory results showed that ECCs incorporating air entrainment to leverage the Temporary High Initial Air Content concept achieved consistency suitable for pumpability, sprayability, and thickness buildup, while maintaining strength, deflection-hardening, and durability. The parametric study highlighted the need for more consistent design guidance and indicated that a 1- to 2-inch ECC liner thickness is sufficient to restore the structural capacity of most corrugated metal pipes. Field inspections revealed excellent performance of ECC-repaired inverts, with no cracking or debonding after up to 6.5 years in service, whereas conventional cementitious liners exhibited significant cracking within 3 to 4 years. Overall, these findings demonstrate that properly designed ECCs can provide superior crack control and durability, offering the Virginia Department of Transportation a robust and practical solution for trenchless corrugated metal pipe rehabilitation.]]></description>
      <pubDate>Sat, 13 Jun 2026 15:31:06 GMT</pubDate>
      <guid>https://trid.trb.org/View/2712609</guid>
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    <item>
      <title>Evaluating Pavement Resilience to Freeze-Thaw Cycles Using Geocell and Geocomposite Reinforcements: A Two-Year Field Study</title>
      <link>https://trid.trb.org/View/2678488</link>
      <description><![CDATA[Freeze–thaw (F–T) cycles are a primary cause of pavement deterioration in regions with seasonal frost, as repeated freezing and thawing weaken pavement layers and reduce long-term performance. The increasing frequency of extreme weather events and irregular temperature fluctuations further complicate patterns of F–T cycles, accelerating degradation and increasing maintenance demands. This study presents a field investigation in Alberta, Canada, evaluating flexible pavements reinforced with geocell and geogrid–geotextile composite (geocomposite) systems under F–T conditions. To capture in situ behavior, both sections were equipped with thermocouples, moisture sensors, and earth pressure cells for continuous monitoring of load response, temperature, and moisture variations. Over two years, the test sections experienced two full F–T seasons with multiple intermittent cycles annually. Plate loading tests and continuous monitoring showed that both geocell- and geocomposite-stabilized pavements performed reliably under environmental stress. The results highlight the potential of geosynthetics to improve pavement resilience in frost-prone regions facing increasing climate variability.]]></description>
      <pubDate>Fri, 12 Jun 2026 15:59:27 GMT</pubDate>
      <guid>https://trid.trb.org/View/2678488</guid>
    </item>
    <item>
      <title>Multi-Axial In-Plane Creep Testing of Geogrids</title>
      <link>https://trid.trb.org/View/2678455</link>
      <description><![CDATA[Geogrids have been used extensively in geotechnical engineering applications for reinforcing and stabilizing engineering systems such as pavements, retaining walls, and embankments, amongst others. In particular, in pavement applications, the stabilization effect due to lateral restraint has been identified as significant. One of the important factors affecting lateral restraint is the multi-axial stiffness of the geogrid due to the nature of repetitive wheel loading. With the continued development of multi-axial structured geogrids, radial stiffness poses significant potential benefits for aggregate interlocking mechanisms. Different standards and technical reports propose test methods for determining the in-plane stiffness of multi-axial geogrids using uniaxial tensile testing. However, uniaxial loading does not represent the actual loading condition in the field since wheel loading creates three-dimensional loading. Therefore, there is a need to investigate the radial stiffness of the geogrids under multi-axial loading conditions. This paper investigates the short-term in-plane radial stiffness of hexagonally structured geogrids under sustained loading and outlines differences in uniaxial and multi-axial loading findings. Within the scope of the study, an experimental apparatus was developed that is capable of applying sustained in-plane loading in uniaxial, biaxial, and triaxial (referred to as uni-bi-tri) directions. In contrast to existing studies reported in the literature, the sleeve concept for the specimen was utilized to avoid any clamping effects. Additionally, there are no fixed boundaries. The test system incorporates Digital Image Correlation (DIC) techniques for strain measurement. The overall goal of this study was to develop a new simple in-plane multi-axial creep testing method. This will enable the difference in radial in-plane stiffness due to different loading orientations to be investigated and understood.]]></description>
      <pubDate>Fri, 12 Jun 2026 15:59:27 GMT</pubDate>
      <guid>https://trid.trb.org/View/2678455</guid>
    </item>
    <item>
      <title>Laboratory Study on Stiffness and Strength of Cement Stabilized Clay Subjected to Four-Season Durability Cycles</title>
      <link>https://trid.trb.org/View/2678451</link>
      <description><![CDATA[The Unified Facilities Criteria (UFC) 3-250-11 is a widely recognized standard among United States government agencies for providing guidelines on soil stabilization in pavement construction, including applications for aircraft and heavy military vehicles. To assess long-term strength degradation due to environmental stressors, the UFC 3-250-11 mandates wetting-drying and freezing-thawing durability cycles for the design of cement-stabilized soils. However, a limitation of this standard is that the prescribed methodologies, derived from the American Standard for Testing and Materials (ASTM), may not fully represent the conditions experienced in regions with all four seasons, such as the midwestern United States. This research addresses this limitation in adjacent with the ongoing need to investigate carbon-friendly stabilizers for soil such as Portland Limestone Cement (PLC). This study examines the effects of combined wetting-drying-freezing-thawing (WDFT) and freezing-thawing-wetting-drying (FTWD) environmental stressors on the engineering properties of cement-treated soil stabilized with Ordinary Portland Cement (OPC) Type I and PLC. A low plasticity clay (CL) soil was treated with both OPC and PLC at an 11% dosage under modified Proctor compaction conditions. Following a seven-day curing period, durability studies were conducted. WDFT and FTWD durability methods were developed by integrating the wetting-drying and freezing-thawing conditions as specified by UFC 3-250-11 for a total of 10 cycles. Post-durability engineering tests included repeated load triaxial testing to determine the resilient modulus and unconfined compressive strength (UCS) tests. Results indicated that durability cycles caused an increase in specimen volume for both stabilizers. Engineering tests showed reductions in stiffness and strength as durability cycles progressed. Specifically, repeated load triaxial testing and unconfined compressive strength results demonstrated reduced stiffness and strength, respectively, for all cement-treated specimens. Notably, PLC-treated specimens exhibited lower stiffness and strength compared to OPC-treated specimens. The findings suggest that while PLC warrants a promising alternative to OPC, its resistance to environmental degradation under four season durability conditions warrants further investigation into its suitability as a soil stabilizer as it may not be as durable as OPC.]]></description>
      <pubDate>Fri, 12 Jun 2026 15:59:27 GMT</pubDate>
      <guid>https://trid.trb.org/View/2678451</guid>
    </item>
    <item>
      <title>Performance of Wicking Geotextile for Flexible Pavements Built over Frost Susceptible Soils</title>
      <link>https://trid.trb.org/View/2678435</link>
      <description><![CDATA[This study investigates the performance of wicking geotextiles in flexible pavements subjected to freeze-thaw cycles and traffic loading. A combination of field experiments and mechanistic-empirical modeling was employed to assess the structural behavior of pavements with and without geosynthetic reinforcement. Test sections were constructed at MnROAD, an interstate highway in Minnesota, with one section utilizing wicking geotextiles and another serving as a control. The analysis included detailed calibration of seasonal modulus multipliers using finite element modeling (ABAQUS) and the MnPAVE software to account for stress and moisture variations. Field monitoring data showed that the volumetric moisture content (VMC) in the wicking geotextile section was consistently lower than in the control section, particularly during thawing periods. The maximum VMC reached 20.6% in the control section, compared to 19.2% in the wicking geotextile section, with a long-term reduction of 2.4% in the reinforced section. Mechanistic-empirical pavement modeling further demonstrated that incorporating wicking geotextiles improves pavement longevity. The control section exhibited a remaining fatigue life of 18 years and a rutting life of 10 years. In contrast, the geotextile-reinforced section showed an extended fatigue life of 23 years and a rutting life of 16 years. The findings highlight the potential of wicking geotextiles in mitigating moisture-related pavement deterioration and improving freeze-thaw resilience.]]></description>
      <pubDate>Fri, 12 Jun 2026 15:59:27 GMT</pubDate>
      <guid>https://trid.trb.org/View/2678435</guid>
    </item>
    <item>
      <title>Aggressive Rehabilitation of Gravel Roads with and without Enzymatic Soil Stabilizers</title>
      <link>https://trid.trb.org/View/2678366</link>
      <description><![CDATA[Granular-surfaced roads built on weak subgrades or subjected to high traffic loads are susceptible to damage as the original roadway cross-section settles and spreads over time, which also reduces the effectiveness of the drainage ditches for removing water from the surface. Such roads may require significant maintenance yet still fail to reach their intended performance and lifespan. Their performance can be restored through aggressive rehabilitation, involving retrieving subgrade material from the ditches to rebuild the cross-sectional roadway and ditch profiles, while compacting and optionally stabilizing the materials to improve strength and stability. In the present study, four test sections were aggressively rehabilitated on a granular-surfaced road at a military base in Johnston, Iowa. The road experienced decades of high traffic from heavy vehicles, causing it to widen significantly beyond its original width of approximately 26 ft. This flattened the ditches and inverted the crown which retained water instead of draining efficiently. For the first two test sections, after aggressively rebuilding the profile, the surfacing aggregates and several inches of subgrade were treated with a liquid soil stabilizer derived from plant-based organic enzymes to improve strength and stiffness. Smooth-tired compaction and sheepsfoot compaction were used for the first and second sections, respectively. The third and fourth sections were also aggressively rebuilt and constructed with smooth tire compaction in one section and sheepsfoot compaction in the other, but without enzymatic stabilizer. A fifth section without any rehabilitation, stabilization, or maintenance was also monitored and tested as a control. Field Automated Dynamic Cone Penetrometer (ADCP) and Light Weight Deflectometer (LWD) tests were performed to measure the strength and stiffness of the road sections at five different construction stages over two winter-spring cycles: (1) before construction, (2) after construction in fall 2023, (3) after thawing in spring 2024, (4) in fall 2024, and (5) after thawing in spring 2025. The abrasion resistance of the roadway surfacing aggregates was also evaluated under simulated traffic loading using a laboratory gyratory compaction device. The gradation of the coarse fraction of surface material was analyzed before and after gyratory compaction tests using the Iowa DOT’s rapid Camsizer. The results of the tests showed a general improvement in the mechanical properties of the enzyme-stabilized sections compared to the untreated sections. The field California Bearing Ratio (CBR) values determined from correlations to ADCP tests and field LWD stiffness values both increased significantly over all time stages due to enzymatic stabilization, which can be attributed to increased cohesive bonding between the soil particles. These findings highlight the ability of aggressive rehabilitation to restore drainage ability, as well as the practical applicability and potential use of enzymatic chemical stabilizers to improve the performance of granular-surfaced roads.]]></description>
      <pubDate>Fri, 12 Jun 2026 15:59:27 GMT</pubDate>
      <guid>https://trid.trb.org/View/2678366</guid>
    </item>
    <item>
      <title>Enhancing Durability and Permanency of Problematic Soils Using Silica-Based Co-Additives with Calcium-Based Stabilizers</title>
      <link>https://trid.trb.org/View/2678337</link>
      <description><![CDATA[Construction of pavements and other lightweight structures on expansive soils is a considerable cause of concern for transportation infrastructure practitioners. Several researchers have recommended the use of silica-based co-additives with calcium-based stabilizers to overcome the problems associated with long-term performance of such infrastructures. However, very little focus has been directed towards understanding the durability and permanency of such treatment methods. A research program was developed to address issues regarding the durability and permanency of the nanosilica co-additive treatment when commixed with a traditional Ca-based stabilizer. Engineering tests such as soaked strength and volumetric swell measurements were performed to measure the moisture susceptibility. Unsaturated studies using soil water retention curves were performed to understand the pore structural changes after treatments. And finally, leaching studies on treated soils were performed to understand the efficacy of the nanosilica in preventing the loss of primary stabilizers. Experimental results showed that the application of silica-based co-additives with lime to treat high plastic problematic soil significantly changes the durability of the treated soils against moisture intrusion. The SWCC helped to understand the moisture-holding ability in different soils. And finally, the leaching test provided some preliminary insight on the effect of nanosilica in reducing the Na+ leaching, while not affecting Ca2+ leaching, as compared to only lime-treated soils. Overall, the study helped to develop a preliminary understanding of the behavior of the silica-based co-additive and lime treatments for long-term performance of transportation infrastructure.]]></description>
      <pubDate>Fri, 12 Jun 2026 15:59:26 GMT</pubDate>
      <guid>https://trid.trb.org/View/2678337</guid>
    </item>
    <item>
      <title>Novel Four-Season Durability Methods for Cement-Stabilized Clays</title>
      <link>https://trid.trb.org/View/2712016</link>
      <description><![CDATA[The durability of stabilized subgrades is the backbone for ensuring pavement’s longevity. Its realistic evaluation is the key to accurate prediction of a pavement’s performance, aiding in the planning of maintenance and rehabilitation. Current ASTM standards for durability assessment of cement-treated soils discuss wetting–drying (WD) and freezing–thawing (FT) separately (in ASTM D559 and ASTM D560, respectively) and do not account for sequential interactions between moisture and temperature fluctuations. With weather patterns becoming more complex, most regions have already started experiencing all four seasons with varying intensities and frequencies. This makes the need for coupled durability assessments highly relevant to mimic the sequential interactions between environmental stresses induced by all four seasons. This paper thus presents two novel coupled durability methods, namely, wetting-drying-freezing-thawing (WDFT) and freezing-thawing-wetting-drying (FTWD), developed by a sequential combination of the existing ASTM standards for WD and FT. Low-plasticity clay specimens stabilized with two stabilizers, ordinary Portland cement (OPC) and Portland limestone cement (PLC), were considered for the coupled durability studies. The influence of the WDFT and FTWD cycles (0, 3, 7, and 10) on the performance of stabilized soils is determined through conventional volumetric and mass measurements. Additionally, rigorous engineering strength evaluations, including the unconfined compressive strength and resilient modulus, were employed, with pavement applications as the primary focus. Findings revealed that the sequence of environmental stressors greatly influences the performance, with WDFT being more detrimental by causing rapid volumetric changes and faster stiffness degradation in both OPC and PLC-stabilized soils, the effect being more pronounced in the latter case.]]></description>
      <pubDate>Wed, 10 Jun 2026 09:06:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/2712016</guid>
    </item>
    <item>
      <title>Durability and Microstructural Performance of Self-Compacting Concrete Made with Recycled Aggregates</title>
      <link>https://trid.trb.org/View/2711984</link>
      <description><![CDATA[The present study investigates the durability and microstructural behavior of self-compacting concrete (SCC) made with recycled aggregates (RA) under aggressive environmental conditions, including sulfate, acid, and chloride attacks. Three RA replacement ratios (0%, 50%, and 100%) were examined. The study evaluates the influence of RA on the chemical resistance of SCC, supported by microstructural analysis using scanning electron microscopy and energy-dispersive X-ray spectroscopy. The results reveal that RA content influences the performance of SCC in aggressive environments. Under sulfate exposure, the mix with 100% RA showed higher expansion rates (96% in magnesium sulfate and 53% in sodium sulfate) compared with the control mix (64% and 24%, respectively). Similarly, in acid environments, the 100% RA mix exhibited greater mass loss (12.6% in sulfuric acid and 9.2% in hydrochloric acid) than the control mix (7% and 5.7%, respectively). Furthermore, chloride penetrability increased with RA content, as evidenced by a higher charge passed, from 3,378 coulombs for the control mix to 4,586 coulombs for the 100% RA mix at 28 days. Microstructural analysis identified the formation of expansive products such as ettringite and gypsum in sulfate-exposed samples, while acid exposure led to the formation of calcium chloride and non-expansive salts, contributing to material changes. The study highlights that attached mortar play a significant role in the behavior of SCC under aggressive conditions. These findings demonstrate that RA can be effective when used in SCC, though careful consideration of its properties is essential to ensure performance in challenging environments.]]></description>
      <pubDate>Tue, 09 Jun 2026 10:54:10 GMT</pubDate>
      <guid>https://trid.trb.org/View/2711984</guid>
    </item>
    <item>
      <title>Experimental Research on Proton Exchange Membrane Fuel Cell Durability Considering Degradation Driving Cycle and Temperature</title>
      <link>https://trid.trb.org/View/2665551</link>
      <description><![CDATA[The durability of proton exchange membrane (PEM) fuel cells has been a key factor hindering the commercialization of fuel cell vehicles. In this research, a voltage-based test is designed to evaluate the effects of degradation driving cycles and temperature on the durability of PEM fuel cells. The degradation driving cycles consist of idling, high load, load changing, and start–stop, while the test temperature is set between 60 °C and 85 °C. To demonstrate the test results comprehensively, a linear fitting method and the cell voltage monitoring (CVM) consistency are introduced to explore the changes of reversible degradation of the PEM fuel cell and the internal consistency of the stack. Results show that the optimal temperature of the PEM fuel cell stack varies with degradation driving cycles, which leads to significant improvements in both mean voltage and voltage consistency. The maximum improvement of the test is up to 4.20% in mean voltage and 229.63% in CVM consistency, respectively, compared to the cases under nonoptimal temperatures. Based on the analysis and calculation results of the voltage degradation rate, a novel degradation prediction formula for PEM fuel cells is developed by incorporating reversible degradation effects under typical degradation driving cycles and different temperatures.]]></description>
      <pubDate>Mon, 08 Jun 2026 08:38:12 GMT</pubDate>
      <guid>https://trid.trb.org/View/2665551</guid>
    </item>
    <item>
      <title>Geo-Congress 2026: Geosynthetics, Pavements, and Soil Improvement</title>
      <link>https://trid.trb.org/View/2709170</link>
      <description><![CDATA[This Geotechnical Special Publication contains 60 peer-reviewed papers from the Geo-Congress 2026, held in Salt Lake City, Utah (March 2026). Papers cover geosynthetics; pavements; soil improvement; innovative materials and ground improvement techniques; pavement geotechnics; and design and performance of various types of geosynthetics.  Specific topics include slope reinforcement, geogrids, embankments, pavement resilience, geomembranes, nanocoatings, geosynthetic reinforcements, recycled plastics, airport pavements, pavement subgrades, freeze-thaw resistance, foundations engineering, soil stabilization, biopolymers, and sandy soils.  This publication offers insight into current trends in geosynthetics, pavements, and soil improvement for researchers, practitioners, and members of governmental organizations.]]></description>
      <pubDate>Fri, 05 Jun 2026 11:26:46 GMT</pubDate>
      <guid>https://trid.trb.org/View/2709170</guid>
    </item>
    <item>
      <title>Monitoring and Modeling of Soil Thermal and Hydraulic Behavior Beneath a Granular-Surfaced Roadway</title>
      <link>https://trid.trb.org/View/2113191</link>
      <description><![CDATA[Annual freeze–thaw cycles reduce the overall performance and ride quality of granular-surfaced roadways by causing significant damage in the roadbed system during spring thaw periods. The severity of the damage depends on the subgrade properties and external environmental factors. Field monitoring can play an important role in quantifying these factors as well as the roadbed subgrade responses to further our understanding of the resulting moisture transport and freeze–thaw mechanisms. Field monitoring can also be used to assess the effectiveness of computational models that use measurements of the environmental factors to predict the subgrade response. In this study, an extensive sensor network was installed up to a depth of 213 cm (7 ft) under a granular-surfaced roadway in Hamilton County, Iowa, for continuous measurement of soil temperature and water content. Soil index properties and hydraulic properties of the subgrade soils were determined by laboratory testing of disturbed and intact soil samples. This paper presents and compares the collected data on in-situ soil temperature and soil moisture distributions with those of preliminary computational modeling of the soil response using the SHAW Model. Laboratory-assessed soil properties and weather station measurements were used as inputs for the computational predictive models. The computational models give promising results, particularly for prediction of the subgrade temperature profiles.]]></description>
      <pubDate>Thu, 28 May 2026 17:09:38 GMT</pubDate>
      <guid>https://trid.trb.org/View/2113191</guid>
    </item>
    <item>
      <title>Study on the Regulation of the Three-Phase Microenvironment in Low-Platinum MEA</title>
      <link>https://trid.trb.org/View/2692161</link>
      <description><![CDATA[With the growth of energy demand, fuel cells as efficient and clean energy devices, have attracted increasing attention. However, the high cost of membrane electrode assembly (MEA) restricts their large-scale application. Therefore, reducing the platinum usage and improving performance have become key research point. In this work, MEA was prepared and excellent performance of 1.52 W·cm-2 was achieved at a low platinum loading. The influence of different ionomer/carbon (I/C) ratio on the performance of fuel cells was systematically investigated. It was found that the performance of the MEA was the highest when the I/C ratio is 0.6. Quantifying hydrophilic and hydrophobic characteristics of catalyst layers with varying ionomer contents revealed that the proton conduction efficiency is optimal when the I/C ratio is 0.6. This balance established efficient proton conduction pathways, from the results of proton conduction impedance testing. SEM analysis demonstrated that pore structure integrity was compromised at non-optimal I/C ratios, exhibiting pore blockage or cracking. The CV test results confirmed that the electrochemical active surface area (ECSA) reaches a maximum of 40 m2gPt-1 when the I/C ratio is controlled at 0.6. And the EIS tests indicated that the lowest charge transfer impedance. Combined the physical and electrochemical characterization results with I-V curves, it was clear that the proper ratio of the low I/C region benefits the mass transfer and proton conductions. This study provides theoretical and technical support for performance enhancement and has the potential for the large-scale application of low-platinum MEA in fuel cells in the future.]]></description>
      <pubDate>Thu, 28 May 2026 17:09:30 GMT</pubDate>
      <guid>https://trid.trb.org/View/2692161</guid>
    </item>
    <item>
      <title>Laboratory and Field Assessment of Corrosion Resistance and Durability for Coated Railway Fastening Systems in the Sandy Desert Environment</title>
      <link>https://trid.trb.org/View/2665651</link>
      <description><![CDATA[Railway infrastructure in arid regions suffers from rapid material degradation due to sandstorms and salt-bearing dust. Fastening systems are especially prone to corrosion, leading to increased maintenance and safety concerns. This research evaluates the corrosion resistance and relative cost performance of three coating systems, nano coating, Dacromet and hot-dip galvanizing, applied to steel fasteners used in desert railway tracks. Laboratory salt spray testing and three-year field exposure were conducted to assess performance. Nano coatings showed the highest lab resistance (up to 1200 h), followed by hot-dip galvanizing (1000 h) and Dacromet (500 h). In contrast, field tests showed that hot-dip galvanized components had the lowest surface corrosion (~5%), while nano coatings (~15%) and Dacromet (~30%) were less durable in practice. Cost comparisons indicated that Dacromet had the lowest initial cost, hot-dip galvanizing had the highest, and nano coatings had a moderate increase. Overall, hot-dip galvanizing provided the best balance of durability and reliability for desert applications, while nano coatings offer potential with further improvements in mechanical resilience.]]></description>
      <pubDate>Tue, 26 May 2026 11:56:23 GMT</pubDate>
      <guid>https://trid.trb.org/View/2665651</guid>
    </item>
    <item>
      <title>Light-Emitting Diode Taxiway Edge Light Photometric Evaluation</title>
      <link>https://trid.trb.org/View/2696967</link>
      <description><![CDATA[The Federal Aviation Administration Airport Safety Technology Research and Development Subteam initiated a long-term study of light-emitting diode (LED) taxiway edge lights. The purpose of this study was to determine and evaluate the photometric performance, durability, and reliability of LED taxiway edge light fixtures. LED taxiway edge lights degrade in intensity over time reducing the visibility to pilots. When this occurs, the LED light must be replaced. However, the exact time to replace the fixture to obtain the highest cost effectiveness is unknown. The goal of this project was to determine how the intensity changes with time and when the lights should be replaced. To do this, 24 LED taxiway edge lights and 6 incandescent lights were installed in a test bed; the latter were used as a baseline for the test. The test objectives were to (1) determine the electrical characteristics of an airfield circuit with LEDs, (2) evaluate the photometric performance of LED taxiway edge light fixtures compared with incandescent taxiway edge light fixtures, and (3) evaluate the maintenance required over time. It was determined that the photometric performance of the LED taxiway edge light fixtures was significantly better than the incandescent taxiway edge light fixtures. The average photometric intensity of the incandescent taxiway edge light fixtures deteriorated to 43% in 2 years, while the average photometric intensity of the LED taxiway edge light fixtures deteriorated to 77% in 2 years. The research found that some manufacturers' electronic circuit boards had difficulty setting to the correct intensity that was selected. LED taxiway edge lights, in addition to having a better deterioration rate than incandescent taxiway edge light fixtures, also have a higher-average photometric intensity after 2 years of operation than the incandescent taxiway edge light fixtures.]]></description>
      <pubDate>Sat, 23 May 2026 18:35:55 GMT</pubDate>
      <guid>https://trid.trb.org/View/2696967</guid>
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