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    <title>Transport Research International Documentation (TRID)</title>
    <link>https://trid.trb.org/</link>
    <atom:link href="https://trid.trb.org/Record/RSS?s=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" rel="self" type="application/rss+xml" />
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    <language>en-us</language>
    <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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      <link>https://trid.trb.org/</link>
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      <title>Långsiktiga egenskaper och klimatavtryck av asfaltmassor med biobindemedel : laboratoriestudie och livscykelanalys</title>
      <link>https://trid.trb.org/View/2666493</link>
      <description><![CDATA[Bio-asphalt with bio-extended bituminous binder, where a renewable binder partially replaces petroleum bitumen, is a promising solution to reduce the asphalt industry's fossil dependence and climate impact. This study has investigated how a bio-binder affects the long-term performance and climate impact of asphalt mixtures. The study focused on bio-extended bituminous binders containing Tall Oil Pitch (TOP) and a polymer-modified bitumen (PMB) with a biogenic component as alternatives to conventional bituminous binders. The methods in this study include laboratory testing of binders and asphalt mixtures, such as ageing, rheology, fatigue, cracking resistance and water sensitivity. A life cycle assessment (LCA) has also been carried out to assess the climate impact from raw material extraction to pavement (construction stage, life cycle phases A1-A5 according to European standards for sustainability of construction works), with a special consideration of biogenic carbon (part of life cycle phases C/D according to the European standards). The results show that bio[1]extended binders with TOP meet technical requirements for bituminous binders. However, at a higher TOP content, brittleness and reduced fatigue resistance of asphalt mixtures can occur at low temperatures after ageing. The PMB with a biogenic component showed good performance. The LCA shows that bio-extended binders marginally increase the fossil Global Warming Potential, but biogenic carbon accounting according to an alternative method could halve the total climate impact. This study shows that bio-extended binders have the potential to contribute to more sustainable asphalt pavements. For continued development, full-scale trials are recommended, as well as further research on ageing, reuse, alternative adhesion promoter and standardisation of climate accounting for biogenic materials in asphalt.]]></description>
      <pubDate>Thu, 05 Feb 2026 08:32:43 GMT</pubDate>
      <guid>https://trid.trb.org/View/2666493</guid>
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    <item>
      <title>Effect of Aging Upon the Volumetric Properties and the Linear Viscoelastic Behaviour of Asphalt Mixes Containing Recycled LDPE Flakes</title>
      <link>https://trid.trb.org/View/2652129</link>
      <description><![CDATA[This paper investigates the effect of aging on the volumetric properties and the Linear Viscoelastic (LVE) behaviour of dense-graded mixes containing 0, 1, and 2 percent of recycled Low-Density Polyethylene (LDPE). The LDPE-modified mix design saved 0.5 · percent bitumen. An accelerated long-term aging protocol on loose mix is proposed. The volumetric properties study comprised maximum specific gravity (Gmm) and Shear Gyratory Compactor "compactability" tests. The LVE behaviour was characterised from a complex modulus (E*) test performed over a wide range of temperatures (-35 to 50°C) and frequencies (0.01 to 10 Hz). The thermal aging seemed not to affect not the LDPE, overall reducing the sensitivity to aging of plastic-modified mixes. Moreover, the Gmm and absorbed bitumen content (Pba) did not change after aging, while the compactability was kept constant or slightly improved. This allowed the preparation of comparable cylindrical samples with different aging levels. Both aging and plastic induce a stiffening effect on the mix at intermediate and high temperatures. Contrary to aging, the LDPE effect reversed and reduced the mix stiffness at low temperature due bitumen becoming stiffer than plastic particles. Overall, the LVE behaviour of LDPE-modified mixes suggests better resistance to aging and better thermomechanical performances, such as rutting and potentially thermal cracking.]]></description>
      <pubDate>Tue, 20 Jan 2026 11:16:31 GMT</pubDate>
      <guid>https://trid.trb.org/View/2652129</guid>
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    <item>
      <title>Relating Binder Parameters to Asphalt Mixture Cracking Tests in the Laboratory</title>
      <link>https://trid.trb.org/View/2635619</link>
      <description><![CDATA[Since the inception of the Performance-Graded (PG) asphalt binder specification, G*sin delta has been used as an intermediate temperature parameter intended to be related to fatigue cracking distress. Cracking can be load related and non-load related, so it is important to understand how asphalt binder properties can relate to both types of cracking distress in mixtures. Although G*sin delta seems to have value when characterizing the stiffness of an aged binder, it mostly misses the relaxation component important to asphalt binders as they age and become more brittle. To address this, an experiment was designed with the hypothesis that mixtures made with asphalt binder having worse relaxation properties will have poorer laboratory cracking performance when tested at an equistiffness temperature than mixtures made with asphalt binder having better relaxation properties. Mixture specimens were tested to evaluate stiffness and cracking performance. Results from the cracking tests were related to current and proposed parameters for use in the PG asphalt binder specification. Findings from the experiment indicate that cracking is not easily defined by one test or test condition. When temperature is removed as a factor, the IDEAL-CT test appears to capture relaxation as indicated by asphalt binder properties.]]></description>
      <pubDate>Tue, 20 Jan 2026 11:16:31 GMT</pubDate>
      <guid>https://trid.trb.org/View/2635619</guid>
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    <item>
      <title>Chemical and Rheological Analysis of the Impact of Styrene-Butadiene-Styrene (SBS) on Long-term Oxidative Aging of Polymer Modified Asphalt</title>
      <link>https://trid.trb.org/View/2633013</link>
      <description><![CDATA[Elastomeric polymers have been shown to produce Polymer Modified Asphalts (PMAs) with enhanced mechanical properties and thermal stability that can withstand harsher environmental and traffic conditions. This study explores the effect of increasing Styrene-Butadiene-Styrene (SBS) concentration on aged binders using both rheological and chemical testing. Two PG 58-28 binders, A and B, modified with SBS (0, 2, and 4 percent) were prepared and then aged for 20, 40, and 60 hours in the Pressure Aging Vessel (PAV). Bending Beam Rheometer (BBR) and Dynamic Shear Rheometer (DSR) testing demonstrated that the addition of SBS improved the high-temperature performance and low temperature sensitivity of Binders A and B, which was observed across all aging levels. Using Proton Nuclear Magnetic Resonance (H1 NMR) spectroscopy, this study identified several parameters (i.e., peak area under typical regions of interest such as Hr, Hp and Ha protons) to evaluate aging and SBS concentration. Peak areas obtained from H1 NMR spectroscopy was shown to accurately capture the effects of both SBS modification and aging in the modified binders. This approach allowed the comparison of rheological parameters (i.e., Crossover Temperature and delta Tc) with these chemical parameters to further highlight the potential anti-aging benefits of SBS modification.]]></description>
      <pubDate>Tue, 20 Jan 2026 11:16:31 GMT</pubDate>
      <guid>https://trid.trb.org/View/2633013</guid>
    </item>
    <item>
      <title>Evaluation of Asphalt Binder Aging Resistance through Asphaltenes Modification</title>
      <link>https://trid.trb.org/View/2619129</link>
      <description><![CDATA[The aging process of asphalt binders is a complex phenomenon that can alter binder properties, reducing the durability and performance of asphalt pavements over time. This study investigated the potential use of asphaltenes, a by-product derived from Alberta oil sands bitumen, as a modifier in enhancing the aging resistance of asphalt binders.  This research comprehensively investigated the aging resistance of asphalt binders modified with an optimal concentration of 12 percent asphaltenes (by weight of binder). The binders underwent Frequency Sweep (FS) tests at varying temperatures and frequencies, with complex shear modulus and phase angle master curves developed using the time-temperature superposition principle, followed by the calculation of aging indices. The results demonstrated significant improvements in stiffness, with complex shear modulus increasing by 497 to 546 percent, and enhanced rutting parameter values up to seven times higher at 0.1 rad/s after asphaltenes modification. Furthermore, the aging resistance of the modified binders improved, with short-term aged Complex shear modulus Aging Index (CAI) values reduced by 20 to 23 percent and long-term aged CAI values by 44to 48 percent as compared to neat binders. These findings contribute to the growing knowledge of asphalt binder modification, aiming to improve pavement durability, sustainability, and cost-effectiveness.]]></description>
      <pubDate>Tue, 20 Jan 2026 11:16:31 GMT</pubDate>
      <guid>https://trid.trb.org/View/2619129</guid>
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    <item>
      <title>Data-driven battery aging diagnostics and lifetime extension</title>
      <link>https://trid.trb.org/View/2534273</link>
      <description><![CDATA[Transportation electrification is critical to mitigating climate change, with lithium-ion (Li-ion) batteries playing a pivotal role in the shift to low-carbon energy sources. Given that batteries can account for up to 50% of an electric vehicle's cost, optimizing their lifespan and performance is critical for cost-effective operation. Batteries though, degrade in ways that are inhomogeneous, nonlinear, and dependent on multiple factors. This makes accurate aging diagnostics and prognostics essential for ensuring their safe, efficient use. Diverse operating conditions, complex aging mechanisms, unpredictable usage profiles, and cell-to-cell variations pose significant challenges. At the same time, battery performance, including energy and power, is influenced not only by health state but also by conditions such as temperature, State of Charge (SoC), and applied current. This thesis presents a series of machine learning (ML) frameworks developed using field data from vehicles and laboratory cycling data. One proposed framework is a battery capacity estimation algorithm that integrates multiple ML models with a Kalman filter, accommodating the diverse usage profiles of electric vehicles (EVs) in real-world scenarios. To reduce warranty costs, a histogram-based usage-related ML framework is developed, combining offline global models with online cell-specific models to track and predict future aging. Additionally, a remaining useful life (RUL) prediction model improves accuracy by combining usage and time-series data is developed as well. Beyond aging diagnostics, the thesis proposes a method to extract relationships between battery performance indicators (PIs) and various influencing factors like temperature, SoC, and aging, using a neural network-based framework. Lastly, it introduces an online method to estimate battery plating potential, enabling faster charging while minimizing lithium plating risks to extend the lifetime of the battery. Collectively, these contributions provide practical tools for diagnostics, prognostics, and control, advancing safer, more efficient, and cost-effective use of Li-ion batteries in EVs.]]></description>
      <pubDate>Fri, 04 Apr 2025 15:16:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/2534273</guid>
    </item>
    <item>
      <title>Development of ‘Vehicle Safety for Older Drivers and Passengers’ guidelines</title>
      <link>https://trid.trb.org/View/2431542</link>
      <description><![CDATA[Older people often experience difficulties achieving good seatbelt fit and comfort in vehicles. The use of comfort accessories like cushions and pads is common among older vehicle occupants. Research has demonstrated that some accessories can have a detrimental effect on safety in a crash. Health and road safety professionals are ideally placed to provide advice to older people about how to achieve a safe, functional and comfortable position in vehicles. The ‘Vehicle Safety for Older Drivers and Passengers’ project used a modified Delphi consensus method to develop consensus based guidelines for providing tailored advice about safe and comfortable travel in vehicles as a tool for use by these practitioners.]]></description>
      <pubDate>Tue, 17 Sep 2024 14:49:42 GMT</pubDate>
      <guid>https://trid.trb.org/View/2431542</guid>
    </item>
    <item>
      <title>Older pedestrians hit by vehicles in the Australian Capital Territory</title>
      <link>https://trid.trb.org/View/2431531</link>
      <description><![CDATA[This study examined the number of older pedestrians (65 years and older) hit by motor vehicles in the Australian Capital Territory (ACT). Collision characteristics, location information, and pedestrian injury outcomes were also examined to understand the crashes, in the context of the ACT and its infrastructure. Police-reported crash data (2011-2020) were analysed. Fewer older pedestrians were hit by vehicles between 2011 and 2020 than younger adult pedestrians (18-64 years). However, they had similar rates of being hit per 10,000 population and older pedestrians had a higher overall rate of serious and fatal injury. Half (50%) of the seriously or fatally injured older pedestrians were hit while crossing busy roads with no protected crossings available. Such protection (with speed management and vehicle design improvements) is vital for the future design of metropolitan and suburban spaces and to achieve a safe ACT road system for pedestrians.]]></description>
      <pubDate>Tue, 17 Sep 2024 14:49:29 GMT</pubDate>
      <guid>https://trid.trb.org/View/2431531</guid>
    </item>
    <item>
      <title>Exploring older drivers’ perceptions of ADAS and AVs</title>
      <link>https://trid.trb.org/View/2431520</link>
      <description><![CDATA[Perceptions of Advanced Driver Assistance Systems (ADAS) and Automated Vehicles (AVs) were explored in two focus group studies of 42 older drivers with and without age-related declines. Study 1 explored perceptions regarding ADAS and AVs, focusing on visual, auditory, physical, and cognitive factors. Study 2 extended this, by additionally exploring perceptions following exposure to videos and static vehicle demonstrations of an ADAS and highly automated (Level 4) AV. Findings highlighted the potential for ADAS and AVs to assist those with age-related declines and the need to increase flexibility of warning system alerts to suit abilities of drivers and reduce the complexity of vehicle interfaces. Participants were also concerned that while AVs would assist older drivers, there was a perceived risk of becoming disengaged from driving and unable to takeback vehicle control. Collectively, findings demonstrated the importance of engaging older drivers with and without age-related declines in designing ADAS and AVs.]]></description>
      <pubDate>Tue, 17 Sep 2024 14:49:17 GMT</pubDate>
      <guid>https://trid.trb.org/View/2431520</guid>
    </item>
    <item>
      <title>Older Australian drivers’ preferences in purchasing decisions: advanced vehicle technology</title>
      <link>https://trid.trb.org/View/2431448</link>
      <description><![CDATA[Advanced vehicle technologies (AVTs) have been shown to reduce the risk of crashing and serious injuries to drivers and pedestrians. Uptake of AVTs, however, remains low amongst older drivers even though current literature shows this age group prioritises “safety” when looking to purchase a new car. A discrete choice experiment was conducted with 133 older Australian drivers to investigate what vehicle features influence purchasing decisions, with a focus on AVTs. Results showed that older drivers preferred cars which were more fuel efficient, had more AVTs in them and were also lower in price. These preferences were robust regardless of socio-economic status. Vehicle choice was not impacted by height of the driver’s seat off the ground. This study shows that older Australian drivers are interested in AVTs. Moving forward, this interest may provide guidance on the packaging and pricing of these technologies to meet the needs of older drivers.]]></description>
      <pubDate>Tue, 17 Sep 2024 14:48:03 GMT</pubDate>
      <guid>https://trid.trb.org/View/2431448</guid>
    </item>
    <item>
      <title>Findings from NZ prospective older adult transport and health study</title>
      <link>https://trid.trb.org/View/2431433</link>
      <description><![CDATA[Increasing transport dependence can be difficult for older adults and responsibility often falls on families to aid their out-of-home mobility needs. The New Zealand Prospective Older Adult Transport and Health Study (NZPATHS) is a longitudinal cohort study of 1181 older drivers (48% female; mean age 75y at baseline) and 675 family members (94% daughter/son). Participants identified gaps in service provision that could improve outcomes for older drivers and concerned family members, including accessible community-based information services and alternative affordable transport options. Many older adults reported driving anxiety and changed their driving patterns, but planning for stopping driving was uncommon. Families considered loss of independence and identity, and a reluctance to rely on family as important barriers to stopping driving. NZPATHS aims to inform the development of evidence-based policy on out-of-home mobility among older adults to maintain mobility and independence, while minimising injury risk, and contributing to safe travel for all.]]></description>
      <pubDate>Tue, 17 Sep 2024 14:47:45 GMT</pubDate>
      <guid>https://trid.trb.org/View/2431433</guid>
    </item>
    <item>
      <title>Chemical and rheological evaluation on aging behaviours of SBS-modified binders</title>
      <link>https://trid.trb.org/View/2427510</link>
      <description><![CDATA[The utilization of recycled asphalt concrete, incorporating reclaimed polymer-modified asphalt pavements, could present an opportunity to attain net-zero carbon emissions. This study aims to evaluate the engineering and chemical properties of asphalt binders extracted from hot mix asphalt mixtures with reclaimed styrene-butadiene-styrene (SBS)–modified asphalt pavement (RAP) replacement. Asphalt mixtures containing 0% and 40% RAP were aged at three different levels in the laboratory. The extracted binders of asphalt mixtures were evaluated using dynamic shear rheometer, optical microscope, Fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC), as well as viscosity and softening point tests. The viscosity values of aged SBS-modified binders could comply with specifications; however, softening points were lower than requirements after aging. Polymer degradation was shown to play an important role in the decrease in the softening point. As SBS-modified binders aged, they exhibited an increase in sulfoxide peaks in FTIR, and a shift in elution time towards later retention periods in GPC. Data obtained from multiple stress creep and recovery tests illustrates the elastic properties imparted by the aged SBS-modified binders, and could enhance the rheological behaviour of the recovered binders. Test results from this study illustrate the potential for enhancing sustainability by utilizing aged SBS-modified binders.]]></description>
      <pubDate>Tue, 10 Sep 2024 14:18:40 GMT</pubDate>
      <guid>https://trid.trb.org/View/2427510</guid>
    </item>
    <item>
      <title>Estimating the cost and benefit of low dosage crumb rubber modification of dense graded asphalt mixtures for longer lasting local road surfaces</title>
      <link>https://trid.trb.org/View/2427508</link>
      <description><![CDATA[Crumb rubber modification of bituminous binder and asphalt mixtures provides two significant benefits to the road pavement industry; the consumption of used truck tyres, and the improvement of asphalt mixtures mechanical properties. In heavy duty pavements, high (20- 30% of the binder mass) dosages of crumb rubber have been used to significantly improve the fracture, deformation and temperature resistance of asphalt mixtures. However, the performance of asphalt for local road surfacing is more focused on weathering resistance and anti-ageing properties. In such circumstances, the cost of crumb rubber modification is less justified and lower (5-15%) crumb rubber dosages are more appropriate. Although these lower levels of modification are associated with only modest mechanical property improvement, the potential to slow the weathering and ageing process, leading to longer surface life expectancy, remains significant and attractive. This research estimates the cost and potential benefit of low dosage crumb rubber modification of asphalt mixtures for local road surfacing. The estimated costs include the processing and production of the crumb rubber modified binder and the higher binder content required in asphalt mixtures. The benefits are estimated based on the expected service life, compared to that of otherwise identical unmodified asphalt for local road surfacing. Analysis of cost modelling through use of Monte Carlo simulations indicates that comparative cost reductions resulting from in-house binder blending or streamlined modified binder production by bitumen manufacturers could significantly reduce the additional pavement life required to justify initial cost increases. Further works are suggested to quantify the anti-ageing performance and benefits of crumb rubber modified local road surfaces to prove a cost effective alternative.]]></description>
      <pubDate>Tue, 10 Sep 2024 14:18:38 GMT</pubDate>
      <guid>https://trid.trb.org/View/2427508</guid>
    </item>
    <item>
      <title>Influence of early-age vibration on concrete strength</title>
      <link>https://trid.trb.org/View/2417141</link>
      <description><![CDATA[]]></description>
      <pubDate>Mon, 12 Aug 2024 16:50:47 GMT</pubDate>
      <guid>https://trid.trb.org/View/2417141</guid>
    </item>
    <item>
      <title>Effect mechanism of old asphalt on microstructure and mechanical properties of hot reclaimed pavement materials</title>
      <link>https://trid.trb.org/View/2389466</link>
      <description><![CDATA[]]></description>
      <pubDate>Wed, 12 Jun 2024 09:26:03 GMT</pubDate>
      <guid>https://trid.trb.org/View/2389466</guid>
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