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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>Performance enhancement of recycled asphalt mixtures using polyurethane prepolymer</title>
      <link>https://trid.trb.org/View/2698092</link>
      <description><![CDATA[Reclaimed asphalt pavement (RAP) is generally recycled and reused in asphalt pavement maintenance and rehabilitation. However, several performance concerns regarding recycled asphalt mixtures still remain unsolved, including insufficient resistance to moisture damage and thermal cracking. This study set out to enhance the performance of the recycled asphalt mixtures using polyurethane (PU) prepolymer. PU prepolymer modified bitumen was prepared and the physicochemical properties were evaluated using Fourier transform infrared spectra (FT-IR), fluorescence microscope, dynamic shear rheometer (DSR), and pull-off strength. Furthermore, recycled asphalt mixtures containing two different RAP contents (20% and 40%) were prepared using virgin bitumen or PUMB as binders, and the high-temperature stability, moisture resistance, and low-temperature cracking resistance were evaluated. The results demonstrate that PU prepolymer can reacts with certain functional groups in virgin bitumen and aged bitumen, which significantly improved the stiffness and elasticity of the modified bitumen. In addition, the interface bonding between bitumen and mineral aggregate and RAP aggregate is effectively increased by PU prepolymer, leading to improved high-temperature stability, resistance to moisture damage, and resistance to low-temperature cracking.]]></description>
      <pubDate>Fri, 28 Aug 2026 08:35:01 GMT</pubDate>
      <guid>https://trid.trb.org/View/2698092</guid>
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    <item>
      <title>Experimental Study of Physicochemical, Mixture Ratio, and Strength of Waste Red Mud Concrete Curbstone</title>
      <link>https://trid.trb.org/View/2689364</link>
      <description><![CDATA[In the face of escalating environmental concerns and the urgent need for sustainable construction materials, this study explores the innovative use of waste red mud, an abundant byproduct of the aluminum production process, in the production of concrete curbstones. The unique physicochemical properties of red mud, including its fine texture, high alkalinity, and rich composition of iron, aluminum, and other oxides, are leveraged to enhance the traditional concrete mix. This research delves into the optimal incorporation of red mud into concrete curbstones, focusing on the mixture ratios, physical properties, and resultant strength. Optimal results were observed with a 10 % replacement ratio of red mud, which improves flexural strength; however, higher proportions of red mud (exceeding 30 %) led to a decrease in strength, indicating a threshold for its effective use in enhancing concrete properties. In addition, the study reveals that while high red mud content may induce surface porosity due to uneven vibration, it does not cause significant structural flaws like cracks or stratification. This study establishes red mud as a promising sustainable alternative for replacing traditional materials in concrete curbstone production, paving the way for more eco-friendly practices in highway engineering and construction.]]></description>
      <pubDate>Fri, 31 Jul 2026 09:23:48 GMT</pubDate>
      <guid>https://trid.trb.org/View/2689364</guid>
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    <item>
      <title>Influence of iron corrosion products on the rheological and chemical evolution of bitumen under accelerated weathering simulation</title>
      <link>https://trid.trb.org/View/2693950</link>
      <description><![CDATA[This study investigates the influence of iron corrosion products on the chemical and rheological evolution of bitumen under accelerated weathering simulation. A programmable xenon-arc accelerated weathering system was employed to simulate the coupled effects of irradiation, temperature, oxygen, and humidity during long-term service conditions. Bitumen samples with and without steel wool were subjected to different weathering durations, and their physicochemical properties, rheological behavior, and microstructural evolution were systematically characterized using conventional physical tests, dynamic shear rheometry (DSR), bending beam rheometry (BBR), Fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). Results indicate that accelerated weathering significantly promotes bitumen oxidation and hardening, evidenced by decreased penetration and ductility, increased softening point and viscosity, and progressive deterioration of low-temperature performance. FTIR results indicate that adding steel wool does not generate new functional groups and that carbonyl and sulfoxide remain the dominant oxidation products. This suggests that steel wool affects the rate of aging rather than the fundamental chemical aging pathway. SEM observations show progressive corrosion of the steel wool during prolonged weathering, accompanied by the release of iron oxide particles into the bitumen matrix as discrete solid phases. These particles exhibit a dual effect on rheological behavior: enhancing high-temperature deformation resistance while aggravating low-temperature embrittlement. Overall, the performance evolution of bitumen containing steel wool is governed by a stage-dependent coupling of radiation shielding and rust-particle filling effects. This mechanism helps explain the long-term behavior and potential performance risks of steel-based functional materials in bitumen systems.]]></description>
      <pubDate>Fri, 24 Jul 2026 08:40:26 GMT</pubDate>
      <guid>https://trid.trb.org/View/2693950</guid>
    </item>
    <item>
      <title>Use of nanomaterials in underlying and subgrade soil stabilisation: a review</title>
      <link>https://trid.trb.org/View/2691695</link>
      <description><![CDATA[Soil stability is crucial for construction, traditionally achieved with cement, lime, and fly ash. However, challenges with weak subgrade soils have led to nanomaterials as a promising alternative. This review critically evaluates the application of nanomaterials in improving the physicochemical, mechanical, and microscopic properties of subgrade and underlying soils, based on 136 peer-reviewed studies published between 2002 and 2025. Eighteen nanomaterials were identified, with nano-silica being the most studied. Other notable ones include nano-clay, carbon nanotubes, nano-alumina, nano-magnesium oxide, nano-copper, and polymeric nanomaterials. The review reveals a predominant focus on fine-grained problematic soils, particularly soft clay and silty sand, primarily in research from Iran. Nanomaterials improved soil by reducing plasticity, enhancing compaction, boosting strength (unconfined compressive strength, California Bearing Ratio, shear strength), and lowering permeability through void-filling, pozzolanic reactions, and Calcium Silicate Hydrate gel formation. They also increased durability under freeze-thaw and wet-dry cycles while reducing cement usage. However, concerns remain about cost, scalability, and environmental safety, with gaps in field-scale studies and limited research on nano-ZnO, nano-CuO, and nano-graphene oxide. This review serves as a reference for sustainable geotechnical engineering.]]></description>
      <pubDate>Tue, 21 Jul 2026 09:50:46 GMT</pubDate>
      <guid>https://trid.trb.org/View/2691695</guid>
    </item>
    <item>
      <title>Evaluation of Steel Slag as a Sustainable, High-Performance Aggregate for Railway Ballast: A Comprehensive Review</title>
      <link>https://trid.trb.org/View/2687055</link>
      <description><![CDATA[Modern railway infrastructure demands high-performance materials to withstand increasingly heavy loads while meeting urgent sustainability objectives. This comprehensive review evaluates the feasibility of using Basic Oxygen Furnace (BOF) and Electric Arc Furnace (EAF) steel slags as sustainable alternatives to traditional natural aggregates like granite and basalt. Using a “source-to-performance” approach, the study examines the metallurgical origins of slags and connects them to key physicochemical properties and mechanical behavior in railway ballast applications.Experimental data indicate that steel slag outperforms natural aggregates in nearly all mechanical aspects. Its high specific gravity, angularity, and surface roughness enhance particle interlocking and shear strength. Under cyclic loading, steel slag demonstrates superior stiffness (resilient modulus) and significantly lower permanent deformation and particle breakage. This review critically examines the challenge of volumetric instability caused by free-CaO and free-MgO, concluding that proper aging protocols (3–18 months) effectively mitigate expansion risks while forming a carbonate shield that minimizes heavy-metal leaching. From an environmental perspective, incorporating steel slag into the superstructure supports circular-economy principles and has the potential to reduce the carbon footprint of aggregate production by up to 60%. Validated by full-scale field trials that show reduced track settlement and extended maintenance intervals, this study confirms that properly processed steel slag is a durable, mechanically better, and environmentally responsible resource for modern railway tracks.]]></description>
      <pubDate>Fri, 10 Jul 2026 09:42:18 GMT</pubDate>
      <guid>https://trid.trb.org/View/2687055</guid>
    </item>
    <item>
      <title>Influence of rice husk ash source variability on asphalt modification: Rheological and molecular insights</title>
      <link>https://trid.trb.org/View/2685282</link>
      <description><![CDATA[Rice Husk Ash (RHA), an agro-industrial byproduct generated from rice mill industries, has emerged as a sustainable asphalt modifier. Its potential to enhance the performance of asphalt, while contributing to waste valorization, underscores its relevance in the context of sustainable infrastructure development. However, the characteristics of RHA are highly dependent on combustion conditions, which vary considerably across rice mill facilities, thereby introducing variability in asphalt modification outcomes. Despite several studies on RHA-modified asphalt (RMA), prior research has predominantly considered RHA from a single source, with limited attention to source variability. This investigation addresses this gap by systematically evaluating RHA from three distinct sources to elucidate the influence of specific surface area, pore structure, and, particularly, amorphous versus crystalline silica influence on asphalt modification. A multi-level characterization of the RHA was undertaken to interpret asphalt-RHA interactions and develop a conceptual colloidal model. The performance of RMA was subsequently assessed in terms of storage stability, consistency, and rheology. Principal component analysis provided clear clustering of RMA, demonstrating that RHA sources with similar physicochemical attributes produce comparable performance responses. The findings establish that the source-dependent characteristics of RHA exert a pronounced influence on RMA behavior and present a reproducible, data-driven framework that supports sustainable pavement technologies by enabling more reliable and performance-based use of RHA in asphalt modification.]]></description>
      <pubDate>Thu, 09 Jul 2026 13:29:26 GMT</pubDate>
      <guid>https://trid.trb.org/View/2685282</guid>
    </item>
    <item>
      <title>Effects of Inert and Active Fillers and Their Physicochemical Properties on Asphalt Mixture Performance</title>
      <link>https://trid.trb.org/View/2717195</link>
      <description><![CDATA[The primary objective of this study is to assess the impact of various inert and active fillers, along with their physicochemical properties, on the laboratory performance of asphalt mixtures. To achieve this objective, various fillers, including active fillers derived from industrial wastes, are sampled, processed, and evaluated. Two state-approved asphalt mixes, a stone matrix asphalt (SMA) and a surface mixture, were selected. For each selected filler, the study characterizes its physical and chemical properties and its influence on the mixture’s laboratory performance against major distresses, specifically, rutting, durability, moisture resistance, and cracking. Results indicate an acceptable correlation between the physical and chemical characteristics of the fillers and the performance of the mixes prepared with these different filler materials. Concerning laboratory-mixed performance, mixes containing industrial fillers, particularly fly ash and steel slag, exhibit better rutting and cracking performance than the control mixes for SMA and surface mixes. In relation to durability, the control mix and steel slag appear to enhance the durability of the surface mixtures. SMA, on the other hand, consistently demonstrates robust performance across filler types. For moisture-damage resistance, the tensile-strength ratio is higher for the different industrial filler materials, especially fly ash and steel slag, than for the control filler. In summary, this study recommends using fly ash and steel slag powder as replacements for mineral fillers in asphalt mixtures. These industrial waste-derived fillers are found to outperform conventional fillers while allowing the reuse of industrial waste in the road infrastructure.]]></description>
      <pubDate>Wed, 24 Jun 2026 10:29:07 GMT</pubDate>
      <guid>https://trid.trb.org/View/2717195</guid>
    </item>
    <item>
      <title>Physicochemical mechanisms of asphalt–aggregate interface adhesion: Effects of mineral composition and surface energy</title>
      <link>https://trid.trb.org/View/2666150</link>
      <description><![CDATA[The adhesion and debonding behavior at asphalt–mineral interfaces are controlled by interfacial physicochemical interactions that dictate wetting, adsorption, and moisture susceptibility of these organic–inorganic systems. Although the rheological and colloidal characteristics of asphalt have been widely studied, the influence of mineral surface chemistry and interfacial energetics on adhesion remains insufficiently understood. This study investigated the interfacial adhesion between asphalt and mineral aggregates through a combined experimental and theoretical approach integrating bitumen bond strength (BBS) testing, surface free energy analysis, and zeta potential characterization. Four representative minerals—calcite, dolomite, orthoclase, and quartz—were selected to elucidate the role of mineralogy in interfacial interaction mechanisms. Results show that carbonate minerals (calcite and dolomite) possess higher specific surface areas and more positive surface potentials, enhancing adsorption and electrostatic attraction with asphalt molecules, whereas silicate minerals (orthoclase and quartz) exhibit higher surface polarity and water affinity, leading to moisture-induced debonding. Surface energy calculations further indicate that lower polar and higher dispersive components promote thermodynamically stable adhesion, with calcite exhibiting the smallest adhesion work loss (57.4 %) upon water exposure. These findings advance the understanding of interfacial thermodynamics and charge-mediated adhesion in asphalt–mineral systems and provide fundamental insights for tailoring surface energy and wettability in organic–inorganic composites.]]></description>
      <pubDate>Mon, 11 May 2026 08:50:45 GMT</pubDate>
      <guid>https://trid.trb.org/View/2666150</guid>
    </item>
    <item>
      <title>Efficient improvement of physicochemical properties and plant growth in sandy ecological substrates: performance and mechanisms of biochar-based materials</title>
      <link>https://trid.trb.org/View/2652809</link>
      <description><![CDATA[Engineering damaged exposed slopes often experience severe soil degradation, with soils predominantly composed of weathered bedrock. When such soils are used as ecological slope protection substrates, they commonly exhibit inadequate geotechnical strength and low fertility, which severely restrict the effectiveness and long-term durability of ecological slope protection engineering. Addressing this challenge, this study investigates the potential of combining biochar (BC) and microbially induced calcium precipitation (MICP) to enhance the structural and ecological performance of sandy ecological substrates (SSs). A series of pumping-grouting and plant cultivation experiments were conducted to evaluate the individual and synergistic effects of BC and MICP. Results showed that BC improved porosity and plant growth but reduced dry density, shear strength, and disintegration resistance. MICP significantly increased mechanical strength but inhibited plant growth. When combined, BC facilitated microbial adhesion and CaCO3 precipitation, enhancing MICP performance while reducing BC degradation. However, excessive BC content negatively impacted substrate strength and mineralization efficiency. Optimization experiments identified ideal conditions: 1–2% BC by mass, bacterial concentration at OD600 = 1.0, and calcium acetate and urea at 1.0 mol/L. This optimized scheme significantly improves the structural and ecological performance of SSs with minimal adverse effects on vegetation, demonstrating strong potential for practical ecological slope engineering applications.]]></description>
      <pubDate>Tue, 28 Apr 2026 11:20:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/2652809</guid>
    </item>
    <item>
      <title>Performance of asphalt binders modified with Xinjiang rock asphalt and wax-based warm mix additives: Rheological, chemical, and physical properties</title>
      <link>https://trid.trb.org/View/2657382</link>
      <description><![CDATA[This study examines the composite modification of base asphalt (BA) using Xinjiang rock asphalt (XRA) and three wax-based warm mix asphalt (WWMA) additives (Hon 7686, Sasobit, and KSH-D) to balance high-temperature stability and workability. Fourier transform infrared (FTIR) spectroscopy was used to analyze the chemical-structural changes. Results show that the modification is primarily a physical blending process, as no new characteristic peaks were found. XRA reinforces the aromatic structure, while WWMAs create a crystalline network within the binder. Multi-scale characterization reveals a synergistic reinforcement mechanism in the rock modified bitumen (RMB) with Hon 7686: it reduces viscosity for easier construction while its crystallization stiffens XRA particles. This interaction forms a structural framework that significantly improves resistance to permanent deformation. The RMB+H formulation achieved superior rutting resistance, characterized by low non-recoverable creep compliance (Jnr3.2) and high elastic recovery (R3.2) at 58 °C, meeting the "Extreme (E)" traffic grade requirements. In contrast, RMB+S and RMB+K acted mainly as viscosity modifiers with low elastic recovery (< 10 %). Furthermore, RMB+H showed sufficient low-temperature flexibility at −12 °C and high macroscopic bond strength (4.3 MPa). Multi-criteria decision making (MCDM) analysis identifies the XRA-Hon 7686 composite as the best sustainable option for heavy-duty pavements in extreme climates, offering an optimal balance of rheology and durability.]]></description>
      <pubDate>Tue, 21 Apr 2026 14:30:16 GMT</pubDate>
      <guid>https://trid.trb.org/View/2657382</guid>
    </item>
    <item>
      <title>A Study on the Effect of Synthetic Fuels with Different Properties on Combustion and Exhaust Emission Characteristics of a Heavy-Duty Compression-Ignition Engines</title>
      <link>https://trid.trb.org/View/2646087</link>
      <description><![CDATA[Appropriate fuel properties can be expected to further improve thermal efficiency and exhaust gas emissions, compared to conventional diesel fuel. However, the effects of each fuel property on compression ignition combustion and emission characteristics have not yet been revealed, since each fuel property interacts with others, resulting in the difficulty of identifying them separately. Evaluating the independent effects of each fuel property could help in designing preferable fuels for a future carbon-neutral society. This study investigates the effects of synthetic fuels with different properties on combustion characteristics and exhaust emissions.]]></description>
      <pubDate>Fri, 20 Mar 2026 14:47:18 GMT</pubDate>
      <guid>https://trid.trb.org/View/2646087</guid>
    </item>
    <item>
      <title>Physicochemical Properties Evaluation of Asphalt-Coated Aggregates and Its Influence on Cement Hydration</title>
      <link>https://trid.trb.org/View/2646050</link>
      <description><![CDATA[The detrimental effect of asphalt-coated (reclaimed asphalt pavement or RAP) aggregates on the mechanical strength of portland cement concrete is well documented; however, the aggregates influence on the cement hydration process and subsequent effect on the concrete’s performance is not well established. This study investigates the effect of asphalt-coated RAP aggregates on the cement hydration process and its effect on mechanical strength. Asphalt-coated RAP aggregates were characterized by their physical, chemical, and mineralogical properties. The aging index and asphalt content were also investigated. A total of 13 mixes were formulated at different RAP replacement levels (volume replacement of coarser fraction) of 0%, 20%, 40%, 60%, and 80%. Based on test results, the addition of RAP reduced compressive strength and flexural strength by 8.16%–43.22% and 0.19%–24.95%. Fourier transform infrared (FTIR) analysis indicated an increase in the peaks associated with the clinker phase while peaks associated with the ─ OH stretch of calcium hydroxide disappeared in the RAP-concrete samples. In addition, the reduction in the nonevaporable water content in the RAP-concrete was observed. Thermogravimetric analysis (TGA) also revealed a reduction in the consumption of calcium hydroxide, indicating its impact on cement hydration. This study demonstrates that the mechanical strength of asphalt-coated RAP-concrete is closely linked to changes in cement hydration.]]></description>
      <pubDate>Fri, 20 Mar 2026 08:41:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/2646050</guid>
    </item>
    <item>
      <title>Validation and Refinement of Chemical Stabilization Procedures for Pavement Subgrade Soils in Oklahoma – Volume II</title>
      <link>https://trid.trb.org/View/2675053</link>
      <description><![CDATA[For projects involving a chemically stabilized layer as a part of the structural design of the pavement, it is typical to conduct a mix design to assess the additive content needed to achieve a certain unconfined compressive strength (UCS) and to determine the resilient modulus (MR) of the stabilized soil. However, there is considerable uncertainty regarding whether the strength and resilient modulus of the field stabilized soil are consistent with design values determined in the laboratory. A purpose of this study was to compare results of field tests and laboratory tests on chemically stabilized soil at different curing times to assess whether a relationship exists between field and laboratory measurements. The goal was to determine if a field-testing method could be used to assess whether the strength and stiffness in the field are consistent with laboratory measurements used for design. In addition, numerous other physical and chemical tests were conducted on the soils with an aim to enhance interpretation of UCS and MR and comparisons to field tests.]]></description>
      <pubDate>Sat, 14 Mar 2026 18:19:18 GMT</pubDate>
      <guid>https://trid.trb.org/View/2675053</guid>
    </item>
    <item>
      <title>Wax and surfactant additives for warm-mix SBS asphalt: Rheological and physiochemical insights into performance and mechanisms</title>
      <link>https://trid.trb.org/View/2632455</link>
      <description><![CDATA[Warm-mix asphalt technologies offer tremendous economic and environmental advantages by lowering energy consumption and emissions. This study examined two wax-based (with different molecular chain lengths) and two surfactant-based additives (with distinct polar head groups), with focus on their impacts on viscosity and rheological properties as well as the lower-scale mechanisms. Each additive was blended into a polymer-modified base asphalt at various dosages, and the resulting binders underwent rheological evaluation and physicochemical characterization using differential scanning calorimetry (DSC), gel permeation chromatography (GPC), and atomic force microscopy (AFM). At a dosage of 5 %, the two surfactants (S₁ and S₂) demonstrated equivalent or superior viscosity-reducing capabilities compared to the waxes (W₁ and W₂); for a target mixing viscosity of 0.17 Pa‧s, the temperature reductions were approximately 8.4°C for S₁ and 12.3°C for S₂, in comparison to 7.8°C for W₁ and 10.8°C for W₂. Within the service temperature range, the waxes enhanced stiffness, elasticity, and rutting resistance due to persistent crystalline structures as suggested by DSC and AFM. The significantly enlarged bee structures and the increased proportions of medium molecular weight (MW) fractions may be indicative of the promoted asphaltene aggregation as well as the diminished colloidal compatibility due to the wax hydrocarbons. However, crystalline reversibility and wax-induced colloidal disruption led to complex thermo-rheological behaviors and reduced fatigue and low-temperature cracking resistance, especially for the wax with longer molecular chains. In contrast, the surfactants improved colloidal dispersion and phase compatibility, softened the asphalt, and enhanced the fatigue and low-temperature performance. These outcomes were supported by lowered glass transition temperatures, reduced thermal conductivity, and decreased proportions of the medium-MW fractions. The surfactant with the carboxyl group exerted a stronger microstructural influence than its hydroxyl counterpart. The thermal behavior and surface morphology were slightly affected by the added surfactants. These findings offer insights into the multiscale mechanisms of typical warm-mix additives and would guide their optimized engineering application.]]></description>
      <pubDate>Fri, 23 Jan 2026 09:58:48 GMT</pubDate>
      <guid>https://trid.trb.org/View/2632455</guid>
    </item>
    <item>
      <title>Identification and physicochemical characterization of the transition zone at the fiber-asphalt mastic-aggregate interface</title>
      <link>https://trid.trb.org/View/2619818</link>
      <description><![CDATA[The interface behavior largely determines the mechanical response of fiber-reinforced asphalt mixtures. However, accurately identifying and characterizing the interface transition zone (ITZ) and its physicochemical properties still pose challenges. To investigate the ITZ and interactions of the fiber-asphalt mastic-aggregate, Fourier-transform infrared (FTIR) spectroscopy was utilized for analyzing the physical-chemical interaction mechanisms, while scanning electron microscopy (SEM) coupled with energy-dispersive spectroscopy (EDS) was employed to identify and quantify the extent of the ITZs. Then the relationship between the ITZs and the interfacial bonding performance was discussed. The results indicate that the addition of fibers or aggregates does not result in significant chemical bonding, primarily relying on physical adsorption. The carbon, silicon, and oxygen elements are effective in identifying the ITZs between the inorganic fibers and asphalt mastics, whereas sulfur element exhibits a more pronounced presence in the polyester fiber-asphalt mastic interface. The ITZ width between the fibers and asphalt mastics is approximately 3.3–5.9 μm, with the polyester fiber -asphalt mastic exhibiting the greatest thickness at 5.9 μm. Notably, silicon/calcium element is prominent in the identification of the ITZs among the aggregate-asphalt mastics, with widths ranging from 29 to 37 μm, and the limestone-asphalt mastic ITZ is the widest at 36.3 μm. The width of the ITZ is not completely positively correlated with the interfacial bonding performance. Rather, it is also influenced by the intrinsic properties of the two-phase materials. This study offers a robust methodology for the quantitative analysis of the transition zone at the fiber-asphalt-aggregate interface, establishing a foundation for further comprehensive research.]]></description>
      <pubDate>Tue, 06 Jan 2026 16:25:01 GMT</pubDate>
      <guid>https://trid.trb.org/View/2619818</guid>
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