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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=PHNlYXJjaD48cGFyYW1zPjxwYXJhbSBuYW1lPSJkYXRlaW4iIHZhbHVlPSJhbGwiIC8+PHBhcmFtIG5hbWU9InN1YmplY3Rsb2dpYyIgdmFsdWU9Im9yIiAvPjxwYXJhbSBuYW1lPSJ0ZXJtc2xvZ2ljIiB2YWx1ZT0ib3IiIC8+PHBhcmFtIG5hbWU9ImxvY2F0aW9uIiB2YWx1ZT0iMCIgLz48L3BhcmFtcz48ZmlsdGVycz48ZmlsdGVyIGZpZWxkPSJpbmRleHRlcm1zIiB2YWx1ZT0iJnF1b3Q7RXBveHkgYXNwaGFsdCZxdW90OyIgb3JpZ2luYWxfdmFsdWU9IiZxdW90O0Vwb3h5IGFzcGhhbHQmcXVvdDsiIC8+PC9maWx0ZXJzPjxyYW5nZXMgLz48c29ydHM+PHNvcnQgZmllbGQ9InB1Ymxpc2hlZCIgb3JkZXI9ImRlc2MiIC8+PC9zb3J0cz48cGVyc2lzdHM+PHBlcnNpc3QgbmFtZT0icmFuZ2V0eXBlIiB2YWx1ZT0icHVibGlzaGVkZGF0ZSIgLz48L3BlcnNpc3RzPjwvc2VhcmNoPg==" 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>
    <image>
      <title>Transport Research International Documentation (TRID)</title>
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      <link>https://trid.trb.org/</link>
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    <item>
      <title>Performance optimization and synergistic mechanism of polyurethane/sasobit composite-modified asphalt with different prepolymer proportions</title>
      <link>https://trid.trb.org/View/2711879</link>
      <description><![CDATA[Polyurethane (PU) has emerged as an excellent material for asphalt modification due to its high strength, toughness, and design flexibility. This study utilizes 70# base asphalt (BA) and employs isocyanate- terminated PU prepolymer (ITPP), 1,4-Butanediol chain extender (BDO), Maleic anhydride (MAH), and Sasobit warm mix agent to prepare PU-modified asphalt (PA) and PU/Sasobit warm-mix composite modified asphalt (PSWA) through a disc sawtooth stirring method. The research investigates the synergistic mechanisms of varying proportions of PU prepolymer (5%-20%) and its composite modification with Sasobit on asphalt performance. Through orthogonal experimental optimization, the optimal process parameters for preparing PSWA were identified as: mixing temperature of 135℃, mixing time of 30 min, agitation speed of 3000 r/min, and curing time of 2 h. A comprehensive evaluation was conducted on key indicators of modified asphalt, including penetration, softening point, ductility, viscosity- temperature characteristics, and rheological performance. Results indicate that the incorporation of PU prepolymer significantly enhances the high-temperature performance of asphalt. Additionally, the inclusion of the Sasobit warm mix agent improves the viscosity-temperature characteristics, notably reducing viscosity within the construction temperature range and optimizing high-temperature rheological behavior. Microstructure analysis reveals that PU chemically reacts with the active components of asphalt via the -NCO group, forming a three-dimensional cross-linked network. Sasobit is present in the system as a physically dispersed component, enhancing the microstructure and performance of asphalt through a synergistic interaction with the PU network. This research provides crucial theoretical and experimental support for the development and application of PU/Sasobit warm-mix composite modified asphalt.]]></description>
      <pubDate>Tue, 29 Sep 2026 09:52:51 GMT</pubDate>
      <guid>https://trid.trb.org/View/2711879</guid>
    </item>
    <item>
      <title>Nondestructive Evaluation of Compaction Uniformity in Epoxy Asphalt Pavements on Steel Bridge Decks Using PQI-380 Density Profiling</title>
      <link>https://trid.trb.org/View/2731951</link>
      <description><![CDATA[To overcome the technical difficulties in evaluating the compaction homogeneity of epoxy asphalt (EA) pavement systems on orthotropic steel bridges, the PQI-380 served as a nondestructive tool for detecting density across the full cross-section of both the lower and upper EA pavement layers. By converting the density data into air void content, a complete cross-sectional air void map of the pavement was generated. This approach facilitated the rapid identification of regions with both adequate and inadequate compaction. The compaction uniformity was assessed through the mean, standard deviation, and coefficient of variation (CV) values of air voids. Results showed that regions with air void content exceeding 3 % were classified as noncompliant and prone to early water damage, requiring close monitoring. Additionally, a higher CV value indicated poorer compaction uniformity, with values greater than 24 % suggesting significant segregation within the mixture. In such cases, adjustments to the mix design and compaction plan were recommended. The integration of nondestructive testing with advanced data visualization enabled rapid (2 s per measurement) and comprehensive (full 19 m bridge deck width coverage) compaction assessment, successfully identifying inadequate compaction areas with compliance rates ranging from 68.8 % to 97.5 % across different segments.]]></description>
      <pubDate>Mon, 28 Sep 2026 08:36:51 GMT</pubDate>
      <guid>https://trid.trb.org/View/2731951</guid>
    </item>
    <item>
      <title>Manufacturing process optimization and multi-mechanism stability regulation of high-performance emulsified asphalt</title>
      <link>https://trid.trb.org/View/2711696</link>
      <description><![CDATA[The commonly used Styrene-Butadiene-Styrene (SBS) emulsified asphalt suffered from low viscosity grade and poor storage stability. This paper established a full-dimensional closed framework encompassing precursor asphalt selection, preparation parameter optimization, oil-water stability mechanism elucidation, and macro-micro parameter correlation quantification for high-viscosity and high-elasticity emulsified asphalt (HVE-EA). Grey relational analysis was adopted to clarify the selection of modified asphalt, while single-factor experiments and response surface methodology (RSM) were employed to optimize the coupled preparation parameters of HVE-EA. Furthermore, interfacial tension, particle size distribution, and Zeta potential tests were performed to illustrate the influence mechanism of HVE-EA stability. The results indicated that at the SBS dosage was 9%, the grey relational grade corresponding to the optimal target value reached 0.9413, with the dynamic viscosity exceeding 200000 Pa·s. The RSM was employed to minimize the deterioration of 1d/5d storage stability under the action of coupled influencing factors, confirming that stability reached 0.35% and 2.95% when the emulsifier content, stabilizer content, and soap solution pH were 3.217%, 0.156%, and 2.014, respectively. Through the synergistic regulation of reduced interfacial thermal force, refined particle size, and electrostatic repulsion, the surface tension (SFT), interfacial tension (IFT), average particle size, and Zeta potential of HVE-EA were optimized to 40.12 mN/m, 2.626 mN/m, 3.62 μm, and 98.61 mv, respectively. Notably, the average particle size regulated by soap solution pH and the Zeta potential influenced by emulsifier exhibited a strong negative correlation. This paper provides an elegant system for regulating HVE-EA from microcosmic parameters to macroscopic stability.]]></description>
      <pubDate>Fri, 25 Sep 2026 10:50:32 GMT</pubDate>
      <guid>https://trid.trb.org/View/2711696</guid>
    </item>
    <item>
      <title>Experimental characterization of damage evolution in asphalt concretes: Insights into virgin and polymer-modified binders</title>
      <link>https://trid.trb.org/View/2768644</link>
      <description><![CDATA[This paper presents an experimental investigation aimed at characterizing damage initiation and evolution in asphalt concrete mixtures subjected to mechanical loading. The approach relates damage processes to the dissipation of viscoelastic energy, supporting its application in thermodynamics-based damage modeling frameworks. Two asphalt mixtures incorporating virgin and polymer-modified binders are evaluated. Recognizing the strong temperature dependence of asphalt materials, tests are conducted at 0 °C, 20 °C, and 40 °C. The results show that lower temperatures require considerably higher energy to initiate damage compared to higher temperatures. Moreover, once initiated, damage in both mixtures with virgin and polymer-modified bitumen evolves linearly with the decay of viscoelastic energy across all temperatures. The findings also indicate that substituting virgin bitumen with polymer-modified bitumen not only delays damage initiation but also reduces the rate of damage propagation. However, this effect diminishes at lower temperatures, indicating that the benefits of polymer modification in improving the damage characteristics of asphalt mixtures are less evident under cold conditions.]]></description>
      <pubDate>Wed, 16 Sep 2026 16:15:46 GMT</pubDate>
      <guid>https://trid.trb.org/View/2768644</guid>
    </item>
    <item>
      <title>Integrated viscoelastic-statistical analysis of the fatigue-critical temperature in two polymer-modified asphalt mixes</title>
      <link>https://trid.trb.org/View/2708165</link>
      <description><![CDATA[Asphalt mixes exhibit temperature-dependent behavior and inherent fatigue data dispersion, making fixed testing temperatures and Gaussian assumptions questionable, particularly for modeling fatigue-life dispersion. Furthermore, while previous studies have reported that the fatigue-critical temperature aligns with maximum viscoelastic dissipation in mixes with conventional binders, its applicability to polymer-modified asphalt mixes remains uncertain. This study aimed to identify the fatigue-critical temperature of two polymer-modified asphalt mixes and to evaluate its correspondence with the loss modulus peak, using a Weibull-based probabilistic framework. An integrated viscoelastic-statistical methodology was applied to two styrene-butadiene-styrene (SBS)-modified mixes: a road base asphalt concrete (GB) produced with a 60/85-E binder and a high-modulus mix (EME) formulated with a highly modified asphalt (HiMA) binder. Fatigue tests were conducted using a two-point bending configuration at four temperatures: 0 °C, the standardized 10 °C, and two temperatures corresponding to the peaks of the loss modulus (E2) in the Cole–Cole plane. Fatigue life data were analyzed using a three-parameter Weibull distribution with optimized parameters. The results revealed a nonlinear (U-shaped) relationship between the strain at 106 cycles (ɛ6) and temperature, with a fatigue-critical temperature of 10 °C for the investigated mixes. Under this condition, a critical elastic-viscous balance was observed, with a loss tangent close to 0.104. Weibull modeling successfully captured dispersion and asymmetry, indicating greater predictability for the EME mix. The fatigue-critical temperature for the investigated mixes did not coincide with the peak of the loss modulus (E2), indicating that maximum viscoelastic dissipation does not necessarily define the fatigue-critical condition.]]></description>
      <pubDate>Wed, 16 Sep 2026 14:41:19 GMT</pubDate>
      <guid>https://trid.trb.org/View/2708165</guid>
    </item>
    <item>
      <title>The resistance of PHA-modified bitumen to bacterial degradation: An FTIR study on functional group evolution</title>
      <link>https://trid.trb.org/View/2705873</link>
      <description><![CDATA[Bacteria have been identified as one of the destructive factors of bitumen. For this reason, this research study was conducted to investigate the changes in PHA-modified bitumen under the influence of bacteria in bitumenius. In this regard, polyhydroxyalkanoates (PHAs), which are a biopolymer with industrial applications that can be produced by bacteria, were synthesized by the bacterium Pseudomonas aeruginosa isolated from asphalt mixture. The synthesized biopolymer was mixed with bitumen at concentrations of 1 and 2%. The already bitumen-degrading bacteria reported in two previous articles were inoculated at a concentration 1.5 × 108 cfu/mL on the surface of the bitumen samples. Then, the behavior and changes of the modified bitumen under the influence of these bacteria were investigated. Due to the alignment of the behavioral changes of bitumen with the changes of functional groups, the Fourier transform infrared spectroscopy (FTIR) technique was used to detect these changes. The results showed that PHA can reduce the effects of bacterial attacks on bitumen and also prevent the increase of carbonyl and sulfoxide bonds in bitumen and the decrease in bitumen performance.]]></description>
      <pubDate>Fri, 11 Sep 2026 09:14:18 GMT</pubDate>
      <guid>https://trid.trb.org/View/2705873</guid>
    </item>
    <item>
      <title>Valorization of Recycled Roofing Membrane Polymer Powder in Asphalt Binders Through Balanced Performance-Based Optimization</title>
      <link>https://trid.trb.org/View/2773213</link>
      <description><![CDATA[Recycling waste roofing membrane materials in asphalt binders can be a promising approach for improving pavement performance while reducing polymeric waste accumulation in landfills. This study investigates the effect of waste roofing membrane polymer powder, characterized using Laser Direct Infrared (LDIR) analysis, on the chemical, physical, and rheological properties of asphalt binders. LDIR characterization identified polyvinyl chloride (PVC) as the dominant constituent of the waste material, together with rubber-based particles and minor polymeric phases. This characterization approach provides quantitative insight into the heterogeneous composition of the waste material, addressing a challenge associated with the use of recycled polymer in asphalt modification. The waste polymer powder was incorporated into both unmodified and styrene–butadiene–styrene (SBS)-modified asphalt binders at dosages of 2%, 4%, and 6% by binder weight through wet blending. Binder characterization included Fourier Transform Infrared (FTIR) spectroscopy, rotational viscosity, storage stability, Dynamic Shear Rheometer (DSR), Multiple Stress Creep Recovery (MSCR), Linear Amplitude Sweep (LAS), Bending Beam Rheometer (BBR), and master curve analysis. The results show that waste polymer incorporation improves fatigue resistance and low-temperature performance, particularly at higher dosages. However, excessive polymer dosage negatively affects storage stability and rutting-related properties. Hybrid SBS/PVC modification provides a more balanced rheological response than PVC-only modification. Among the evaluated binders, the 4% SBS/PVC-modified binder exhibits the most balanced overall performance. Regression-based optimization identifies an optimum PVC content of 4.15%. Overall, the findings indicate that waste roofing membrane-derived PVC-rich polymer powder is an effective asphalt binder modifier, providing balanced improvements in binder performance.]]></description>
      <pubDate>Wed, 09 Sep 2026 09:03:06 GMT</pubDate>
      <guid>https://trid.trb.org/View/2773213</guid>
    </item>
    <item>
      <title>Matrix-specific anti-aging response of functionalized graphene-modified asphalt binders under thermal-oxidative and ultraviolet aging: Multiscale structural and chemical evidence</title>
      <link>https://trid.trb.org/View/2773170</link>
      <description><![CDATA[Functionalized graphene has shown potential for improving asphalt aging resistance, but whether its effective dosage can be transferred between neat and polymer-modified binders remains unclear. This study compared the same polyvinylpyrrolidone-functionalized graphene (PGR) in neat asphalt and 4.0 wt% SBS modified asphalt subjected to rolling thin-film oven aging followed by ultraviolet exposure for up to 288 h. Conventional properties were used for dosage screening, while atomic force microscopy (AFM), saturates-aromatics-resins-asphaltenes (SARA) fractionation, gel permeation chromatography (GPC), and Fourier transform infrared spectroscopy (FTIR) were applied to representative binders to examine the accompanying structural and chemical changes. The effective PGR dosage differed markedly between the two formulations. For neat asphalt, 1.0 wt% PGR reduced the viscosity aging index after the most severe sequential aging from 149.0% to 60.5% and substantially improved ductility retention. In the SBS modified asphalt system, 0.3–0.5 wt% PGR produced the most favorable response, with 0.3 wt% providing the better overall balance between aging resistance and dosage efficiency. At this dosage, the viscosity aging index decreased from 108.1% to 47.7%, while the carbonyl-index increase and SBS-related CC loss were reduced from 123% to 69% and from 60.6% to 26.5%, respectively. The multiscale results indicate that PGR was associated mainly with moderated colloidal and molecular size redistribution in neat asphalt, whereas its effect in the SBS-containing binder additionally involved better retention of local adhesion and SBS-related unsaturation. The findings provide measurement-based evidence for matrix-specific anti-aging response.]]></description>
      <pubDate>Wed, 09 Sep 2026 09:03:06 GMT</pubDate>
      <guid>https://trid.trb.org/View/2773170</guid>
    </item>
    <item>
      <title>Aging and regeneration mechanisms of SBS-modified asphalt binder considering the coupling effect of thermo-oxidation, ultraviolet, and humidity</title>
      <link>https://trid.trb.org/View/2705719</link>
      <description><![CDATA[The direct disposal of aging SBS-modified asphalt results in the depletion of valuable resources and increases environmental burdens related to solid waste management. In contrast, recycling asphalt aligns with China’s “dual-carbon” development goals and has emerged as a major focus of research in recent years. During its service life in pavement applications, SBS-modified asphalt is inevitably subjected to aging, primarily driven by the synergistic effects of thermo-oxidation, ultraviolet (UV) radiation, and humidity. This aging process invariably leads to a deterioration in its pavement performance. Previous research has predominantly concentrated on aging and regeneration processes in the context of a single environmental factor, with insufficient understanding of the mechanisms under the combined effects of heat, UV, and humid. To address this, this study selected Guangzhou's hot and humid climate, Chengdu's Warm and humid climate, and Beijing as representative climate regions. By simulating actual environmental conditions, a humid-thermal-UV coupling aging experiment was constructed, combined with microscopic characterization methods such as Fourier transform infrared spectroscopy (FTIR), Fluorescence microscopy (FM), and atomic force microscopy (AFM). A systematic study was conducted on the humid-thermal-UV coupling aging mechanism and regeneration mechanism of SBS-modified asphalt. Results show that a thermal and humid environment accelerates the scission and oxidation of SBS molecular chains, leading to asphalt hardening, damage to its honeycomb structure, and consequently, blurred morphology and reduced fluorescence intensity. The degree of aging under these conditions is significantly greater than that caused by simple thermal oxidation. Additionally, UV radiation intensifies these reactions, causing covalent bond breakage. Regarding regeneration, using less costly waste engine oil (WEO) as a regenerant, experiments with a dosage gradient of 3–9% showed that WEO could effectively replenish the light components of the asphalt, regulate colloidal balance, and restore its viscoelasticity and durability. Based on both macroscopic and microscopic analyses, a 6% dosage of WEO yields the best regeneration effect on humid-thermal-UV coupling aging SBS-modified asphalt, providing theoretical support for anti-aging and regeneration technologies in asphalt pavement.]]></description>
      <pubDate>Tue, 08 Sep 2026 11:41:44 GMT</pubDate>
      <guid>https://trid.trb.org/View/2705719</guid>
    </item>
    <item>
      <title>A Reactive Wanol-based polyurethane for asphalt modification: Mechanism, performance, and synergy with SBS</title>
      <link>https://trid.trb.org/View/2734582</link>
      <description><![CDATA[Reactive polyurethane (PU)-based modifiers have attracted increasing attention in asphalt modification because they can form chemically bonded networks within the binder, improving mechanical performance and reducing phase separation compared with conventional polymers. However, existing PU-modified systems still face challenges related to reaction control, storage stability, and the limited understanding of how synthesis parameters affect binder-scale performance. Meanwhile, SBS, although widely used, interacts mainly through physical blending, which may limit its effectiveness under severe thermal, loading conditions. Therefore, hybrid systems combining chemical and physical modification mechanisms are needed. In this study, a reactive PU modifier was synthesized using Wanol R2305 polyol and methylene diphenyl diisocyanate (MDI), and its performance was evaluated both individually and in combination with SBS. The novelty of the study is the systematic linkage between the NCO/OH ratio, polyurethane network formation, and asphalt binder performance, together with the development of a PU–SBS hybrid modification strategy. FTIR analysis confirmed urethane linkage formation and the development of a crosslinked polymer structure. Modified binders were evaluated through conventional tests, rotational viscosity, DSR, MSCR, BBR, and storage stability analysis. The results showed that PU modification improved stiffness, elasticity, temperature stability, rutting resistance. More importantly, the PU–SBS hybrid system exhibited a pronounced synergistic effect, providing superior elastic recovery, viscoelastic behavior, and high-temperature deformation resistance compared with single-modified binders. The hybrid binder also maintained acceptable workability limits. The hybrid binder containing 2% SBS and 6% PU exhibited the best overall performance, showing G*/sinδ values up to 4.1 times higher than the 4SBS binder and reducing the storage stability difference from 18.2 °C to 4.6 °C. Moreover, the hybrid system maintained acceptable workability despite the significant increase in stiffness and elastic response. Overall, the proposed PU system offers a controlled, mechanism-based modification approach, while its combination with SBS provides an effective pathway for producing high-performance asphalt binders.]]></description>
      <pubDate>Wed, 02 Sep 2026 16:33:56 GMT</pubDate>
      <guid>https://trid.trb.org/View/2734582</guid>
    </item>
    <item>
      <title>Evaluation of the influence of environmental conditions, load levels, and fillers on the self-healing performance of dynamic covalent network modified asphalt</title>
      <link>https://trid.trb.org/View/2736860</link>
      <description><![CDATA[This study investigates the enhancing effect of a self-healing promoter (SHP) based on dynamic disulfide bonds on asphalt healing. Using the Healing-Linear Amplitude Sweep (HLAS) test, the healing efficiency of SHP modified asphalt (SHP-MA) and base asphalt (BA) was evaluated across varying strain levels, durations, temperatures, and filler proportions. Results indicate that the healing enhancement of SHP-MA depends on a strain threshold, which was identified from HLAS tests at maximum strain levels of 10–30%. Specifically, at low-to-moderate strain levels (≤25%), SHP-MA achieves a healing improvement of up to 35.36% over BA. However, beyond a critical strain of 30%, extensive cracking restricts the spatial proximity required for disulfide bond reformation, causing the efficiency to fall below the intrinsic recovery of BA. Furthermore, SHP-MA exhibits significant time-dependence, as prolonged healing intervals increase molecular chain mobility and bond recombination probability. Temperature analysis reveals that the chemical induction mechanism is most effective between 10 °C and 25 °C, where it effectively compensates for the restricted viscous flow of the binder. Notably, the self-healing performance advantage of SHP-MA is amplified in asphalt mastics. These findings demonstrate that dynamic covalent bonds can partially overcome environmental constraints, providing a robust mechanism for asphalt damage recovery.]]></description>
      <pubDate>Tue, 01 Sep 2026 14:02:27 GMT</pubDate>
      <guid>https://trid.trb.org/View/2736860</guid>
    </item>
    <item>
      <title>A comprehensive review of cold-mixed epoxy asphalt: Strength formation mechanisms, binder properties, and performance evaluation of mixtures</title>
      <link>https://trid.trb.org/View/2703301</link>
      <description><![CDATA[Cold-mixed epoxy asphalt (CMEA) has been recognized as a promising binder system for high-performance pavements, particularly in steel bridge deck surfacing and heavy traffic roads. It can be applied at ambient temperature, reducing energy consumption. In engineering practice, solvent-free epoxy asphalt (EA) is commonly used for steel bridge decks due to its superior mechanical properties and resistance to high-stress conditions. Waterborne epoxy asphalt (WEA), primarily asphalt-dominated, exhibits good low-temperature adaptability but often suffers from insufficient mechanical performance, limiting its use in high-performance pavements. Solvent-based EA is rarely selected due to sensitivity to volatilization and environmental conditions. A systematic comparison of WEA, solvent-based EA, and solvent-free EA highlights differences in strength development mechanisms, binder properties, and mixture performance. Curing of CMEA is governed by water evaporation, solvent evaporation, or chemical crosslinking between epoxy resin (ER) and curing agents. Among these systems, solvent-free EA generally offers better construction stability and long-term durability, making it more suitable for demanding service environments. However, the lack of standardized methods for rheological assessment and curing characterization may lead to inconsistent performance evaluations. Future research should focus on long-term aging and damage mechanisms of EA and the development of environmentally friendly, low-volatility systems. A comprehensive life-cycle performance evaluation framework should also be established to support the sustainable application of CMEA.]]></description>
      <pubDate>Tue, 01 Sep 2026 09:09:46 GMT</pubDate>
      <guid>https://trid.trb.org/View/2703301</guid>
    </item>
    <item>
      <title>Study on the Adhesion Characteristics and Improvement of Slate Aggregate with Asphalt Binder Based on the Rolling Bottle Test</title>
      <link>https://trid.trb.org/View/2714168</link>
      <description><![CDATA[The rolling bottle test (RBT) was used to investigate the adhesion of four types of aggregates (slate, limestone, granite, and diabase) to both base asphalt and polymer-modified asphalt (PMA). Additionally, the RBT was applied to evaluate the improvement effects of various antistripping measures on the adhesion performance of slate aggregate. The test results indicated that the RBT was capable of quantitatively assessing the adhesion between various types of aggregates and asphalt binder, the feasibility of applying slate aggregate in asphalt concrete, and the effectiveness of antistripping agents. The high quartz content in slate can result in poor adhesion between slate aggregate and asphalt binder. PMA was found to be the optimal option for improving the adhesion between slate aggregate and asphalt. At the same time, hydrated lime was the most effective antistripping agent when base asphalt was used as the binder. Cement and liquid antistripping agent only had limited improvement effects. The poor adhesion between slate aggregate and base asphalt could not be fundamentally solved by means of antistripping agents. Further tests are needed on an asphalt mixture containing slate aggregate to evaluate its susceptibility to water damage.]]></description>
      <pubDate>Mon, 31 Aug 2026 10:38:39 GMT</pubDate>
      <guid>https://trid.trb.org/View/2714168</guid>
    </item>
    <item>
      <title>Enhancing aramid fibre-modified asphalt mixture through a two-step surface immersion method</title>
      <link>https://trid.trb.org/View/2709474</link>
      <description><![CDATA[Aramid fibres are increasingly employed to reinforce asphalt mixtures; however, their interfacial adhesion with asphalt binder remains limited due to reliance on hydrogen bonding and physical interlocking, resulting in fibre agglomeration and suboptimal performance. This study proposes a two-step surface immersion modification to enhance fibre–binder compatibility. Optimal modification parameters were determined through rheological and mechanical characterization of fibre–asphalt mortar. The introduction of –NH functional groups significantly improved the chemical reactivity of fibres, reduced electrostatic adsorption, increased oil absorption, and enhanced surface roughness. Macroscopic and micromechanical evaluations revealed that the modified fibres improved high-temperature rutting resistance and enhanced low-temperature cracking resistance, as evidenced by increased peak and failure displacements. Compared with unmodified fibres, the modified aramid fibres significantly enhanced the overall mechanical performance of the asphalt mixture. These findings highlight the effectiveness of molecular-level surface functionalization in improving fibre dispersion and interfacial bonding, offering a viable approach to optimizing fibre-reinforced asphalt composites.]]></description>
      <pubDate>Mon, 31 Aug 2026 10:31:30 GMT</pubDate>
      <guid>https://trid.trb.org/View/2709474</guid>
    </item>
    <item>
      <title>Reactive repair of degraded SBS structure in aged SBS-modified asphalt mixtures via polyurethane prepolymer: From molecular-level chemo-rheological mechanisms to macroscopic performance recovery</title>
      <link>https://trid.trb.org/View/2696687</link>
      <description><![CDATA[The high-quality recycling of aged SBS-modified asphalt mixtures remains a challenge in pavement engineering due to the futility of conventional rejuvenating agents in restoring the structure of aged SBS within the asphalt binder. In this study, Polyurethane prepolymer (PUP)-modified asphalt was prepared and utilized with varying PUP dosages to restore the maltene fractions and the degraded SBS structure in aged SBS-modified asphalt mixture. The pavement performance of the regenerated mixtures was evaluated through Marshall stability, rutting, and low-temperature three-point bending tests, etc. The results demonstrated that the incorporation of P-PUMA greatly enhanced the low-temperature crack resistance, and water stability of the PmAM. Specifically, the regenerated PmAM with 4% PUP modified asphalt demonstrated significant recovery across multiple performance metrics. The Flexural tensile strength (RB), Maximum flexural tensile strain (εB), Residual immersion Marshall stability (MS0), and Freeze-thaw splitting strength ratio (TSR) reached 103.71%, 109.6%, 99.41%, and 99.76% of the fresh mixture level, respectively. Gel Permeation Chromatography on the extracted asphalt from the regenerated PmAM showed that weight-average (Mw) molecular weight decreased from 4777 g/mol to 4262 g/mol, indicating that the fresh asphalt in the PUP modified asphalt supplemented the low molecular weight components of the aged binder. Fourier Transform Infrared Spectroscopy and Fluorescence microscope analysis revealed that the broken network structure of the SBS modified binder was repaired due to the reactions between the isocyanate groups of PUP and the aged SBS. This study confirms that PUP modified asphalt enables the high-quality recycling of aged SBS-modified asphalt mixture.]]></description>
      <pubDate>Fri, 28 Aug 2026 08:35:05 GMT</pubDate>
      <guid>https://trid.trb.org/View/2696687</guid>
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