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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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    <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>Thermodynamic-based numerical modeling of induction–microwave heating in asphalt concrete: From laboratory to field scales</title>
      <link>https://trid.trb.org/View/2645719</link>
      <description><![CDATA[This study presents a thermodynamics-based framework for the coupled thermo-electromagnetic constitutive modeling and numerical simulation of induction heating in asphalt concrete. The numerical framework is developed to simulate the induction heating of asphalt concrete under electromagnetic fields at laboratory and field scales, enabling the establishment of a link between laboratory and field scale heating. Poynting’s theorem, representing the total energy in the electromagnetic field, is employed in the thermodynamic formulation to derive the storage and dissipated energy components. The constitutive model is then numerically integrated in the finite element (FE) framework. The laboratory results from the induction heating tests on asphalt concrete were used to calibrate and validate the constitutive model. The calibrated constitutive model is further applied to field-scale simulations to predict induction heating in asphalt pavements and to determine the power ratio required to achieve comparable heating rates between the laboratory and field scales. The simulation results confirm the effectiveness of the proposed model in predicting the induction heating of asphalt concrete. The simulation results reveal substantial differences in the heating process between the field and laboratory scales and highlight the advantages of the proposed model in predicting induction heating for practical applications and establishing a link between laboratory and field scales.]]></description>
      <pubDate>Fri, 20 Mar 2026 08:41:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/2645719</guid>
    </item>
    <item>
      <title>Effect of aging levels and induction factors on self-healing ability by induction heating method in hot asphalt mixtures</title>
      <link>https://trid.trb.org/View/2626347</link>
      <description><![CDATA[Asphalt aging severely degrades pavement performance, necessitating efficient self-healing technologies. The self-healing mechanism was evaluated using induction heating facilitated by scrap iron powder as the inductive agent, incorporated into the filler. The study assesses the combined influence of four critical factors: aging levels (Short-Term/Long-Term), inductive agent dosage (30% and 70% of filler volume), inductive agent particle size (46 μm and 63μm), and testing temperature (5oC and 25oC). Samples were prepared with silica materials and AC 70-60 bitumen. Healing potential was quantified using the Semicircular Bending (SCB) test. The inductive agent was analyzed using X-ray Fluorescence)XRF( and binder chemical changes were evaluated using Fourier-Transform Infrared Spectroscopy (FTIR). To statistically isolate the effect of each factor on the self-healing capability, a Factorial Analysis of Variance (ANOVA) was employed. The ANOVA results conclusively identified Aging as the most statistically significant factor (p < 0.001), leading to a sharp decline in the Healing Index (e.g., from 56% STA to 42% LTA at 25oC). This performance reduction was chemically substantiated by FTIR analysis, which showed an increase in harmful aging-related functional groups (Carbonyl and Sulfoxide). Conversely, the Inductive Agent dosage showed a significant positive effect (p = 0.040), as higher concentrations increased the induced temperature (up to 81.5oC) and improved Healing efficiency. Under optimal conditions, samples achieved 100% recovery of fracture toughness, validating the method's full potential. Ultimately, this study provides a validated statistical and chemical framework, demonstrating that optimized induction heating achieves a 100% restoration of fracture toughness, marking a significant stride towards economically viable and sustainable self-healing pavement solutions.]]></description>
      <pubDate>Fri, 21 Nov 2025 08:46:02 GMT</pubDate>
      <guid>https://trid.trb.org/View/2626347</guid>
    </item>
    <item>
      <title>Evaluation of Combining Heat Induction and Laser Ablation for the Removal of Potentially Hazardous Bridge Coatings</title>
      <link>https://trid.trb.org/View/2600984</link>
      <description><![CDATA[This project aimed to evaluate whether combining induction coating removal (ICR) and laser ablation coating removal (LACR) could be combined to remove hazardous bridge coatings at practical rates. This study included evaluations of the coating removal rates, surface cleanliness, surface profile, steel substrate mechanical properties, recoating adhesion performance, field demonstrations, and environmental and industrial hygiene evaluations of ICR, LACR, and ICR first plus LACR afterward (ICR+LACR). Coating removal data showed that using ICR+LACR could result in a coating removal rate approximately 10 times faster than using LACR alone. ICR can quickly remove the bulk coating layers but leave the residual primer on the steel surface. LACR can then quickly remove the remaining primer layer to provide a clean surface ready to be recoated. Surface analysis showed that LACR provides a much cleaner surface, with fewer contaminants embedded in the surface compared with grit blasting. LACR also leaves less of a surface profile compared with grit blasting. However, LACR surfaces still meet the Virginia Department of Transportation (VDOT) specifications for surface profile before coating. Metallography and mechanical testing showed that the heat from LACR, ICR, and ICR+LACR changed only a very thin layer of the steel substrate, but this change did not affect the mechanical or fatigue properties of the underlying steel. Adhesion testing of inorganic and organic zinc coatings applied to LACR and ICR+LACR surfaces showed acceptable levels of adhesion that were comparable with surfaces cleaned by grit blasting, and the adhesion values met the coating manufacturer’s recommendations. These findings are notable because, although LACR surfaces have a smaller profile than grit-blasted surfaces, LACR surfaces are much cleaner, thereby creating sufficient adhesion. Environmental and industrial hygiene measurements indicated that LACR units that do not use an effective built-in fume extractor can expose employees to unacceptable levels of laser-generated air contaminants during coating systems removal. The quantity of hazardous waste generated by LACR and ICR is less than the amount of waste created through traditional blasting measures. ICR waste is not captured through debris collection and should be contained on tarpaulins or other similar drop cloths. This study recommends that VDOT develop guidance and specifications for using the ICR+LACR method for bridge coating removal. The study also recommends that VDOT identify upcoming bridge coating removal projects, such as girder end recoating and repair projects, for which ICR+LACR could be specified or permitted as a removal method. In addition, the Virginia Transportation Research Council should initiate a technical assistance project to evaluate the mechanical properties of high-strength bolts subject to heat, such as from ICR. VDOT can achieve an environmentally and worker-friendly coating removal method by using ICR+LACR. This method is a competitive alternative to grit blasting and can be used in targeted locations to help extend the service life of steel bridges.]]></description>
      <pubDate>Mon, 22 Sep 2025 11:58:13 GMT</pubDate>
      <guid>https://trid.trb.org/View/2600984</guid>
    </item>
    <item>
      <title>Shear failure behavior of the interface between asphalt mixture and ice layer by electromagnetic induction heating</title>
      <link>https://trid.trb.org/View/2587417</link>
      <description><![CDATA[Induction heating has been widely applied for asphalt pavement deicing. However, it is challenging in practice to accurately determine the optimal deicing times, which can lead to inefficiency and extra energy consumption. To address these issues, an electromagnetic induction heating shear deicing detection device was developed to capture the deicing times in this research. The heating characteristics of steel fiber modified asphalt mixtures were investigated under different steel fiber contents, heating distances and currents. The Interface Failure Times (IFTs) were obtained from shear force curves recorded by the device. The response surface methodology was applied to the prediction of the heating characteristics and IFTs. Afterwards, the effects of the texture depth and solution media on the shear deicing behavior were evaluated. The deicing performance of steel fiber coatings with varying areal densities was assessed. The results indicated that the heating characteristics and IFTs were well predicted by the ternary quadratic equation under different test conditions. The deicing times obtained from the IFTs were shorter and more intuitive than the ones derived from the heating rate. The removal of the ice from the mixture surface was hindered by its interaction with the surface texture. The salt ions promoted the generation of bubbles and pores in the ice, resulting in shorter IFTs. In addition, the steel fiber coating improved deicing efficiency by 26.2 % and reduced the steel fiber content by 90.3 % compared to the steel fiber modified asphalt mixture. These findings further contribute to high-efficiency deicing with low energy consumption and cost.]]></description>
      <pubDate>Wed, 17 Sep 2025 09:00:47 GMT</pubDate>
      <guid>https://trid.trb.org/View/2587417</guid>
    </item>
    <item>
      <title>Evaluation of the influence of induction factors (time and power), geometric characteristics and environmental conditions on the self-healing capability of warm mix asphalt</title>
      <link>https://trid.trb.org/View/2562626</link>
      <description><![CDATA[Despite the well-known environmental, technological, and economic benefits of warm mix asphalt (WMA), the decreased production temperature of WMA mixtures can cause reduced bitumen-aggregates adhesion, increasing the susceptibility of the mixtures to cracking. This study discusses the simultaneous use of warm mix asphalt and induction heating technologies to improve the self-healing capability of these mixtures in order to increase their performance and durability, which can lead in turn to prolonged pavement lifespan and lower maintenance and repair costs. The aim of this research is to evaluate the self-healing capability of conductive warm mix asphalt using induction heating. Asphalt samples with iron powder and activated carbon were tested using semi-circular bending (SCB) at 25°C and −16°C with notch lengths of 10 mm and 20 mm. Induction heating was performed with the use of power of 13.9 kW and 16.7 kW and heating time of 60, 90, and 120 seconds. Results indicated that increased power and heating time led to a higher healing index. Asphalt samples containing Sasobit at 25°C inductive heating time of 120 seconds and heating power of 16.7 kW attained a healing index of 88.5 %, which indicates the optimal performance of the additive in medium temperatures. In low temperatures, asphalt samples containing ZycoTherm indicated a healing index of 60 %, showing its higher efficiency in low temperatures. ZycoTherm performed better at low temperatures because of its anti-stripping properties, whereas Sasobit performed poorly at low temperatures because of its synthetic wax and high cold-sensitivity properties. The use of iron powder as an inductive agent demonstrated that inductive heating can serve as a viable healing method for asphalt pavements, contributing to the development of sustainable and eco-friendly road infrastructure.]]></description>
      <pubDate>Thu, 26 Jun 2025 16:12:28 GMT</pubDate>
      <guid>https://trid.trb.org/View/2562626</guid>
    </item>
    <item>
      <title>Improvement in Anti-Icing Performance of Electromagnetic Induction Heating through Optimization of Energy Transfer in Asphalt Pavement</title>
      <link>https://trid.trb.org/View/2529638</link>
      <description><![CDATA[Icing on the road is a serious problem affecting vehicle driving and road durability. Therefore, it is critical to take effective measures to inhibit the degree of road icing. Currently, electromagnetic induction heating pavements offer an effective solution to address road icing issues. However, the low efficiency of magnetic energy utilization results in significant energy losses during the heating process. To tackle this, the paper proposes a novel pavement structure design and optimizes the conversion of magnetic energy to electrical energy, improving energy utilization and enhancing the deicing efficiency of electromagnetic heating pavement. The heating evaluation and energy improvement rate indexes were proposed to evaluate the ice melting of electromagnetic induction heating, and the effects of ferrite content, type, and thickness on ice melting performance were also compared and analyzed. The results show that a magnetic permeable layer at the bottom of asphalt concrete can improve the heating efficiency and ice melting performance, and the average heating efficiency and energy increase rate both enhance as the amounts of ferrite increases. The increase of magnetic permeable layer thickness also improves the induction heating and ice melting performance. In addition, the properties of magnetically permeable materials are the key factors affecting heating and deicing, and the heating and ice melting performance of nickel-zinc ferrite is always greater than that of manganese-zinc ferrite. All in all, this research could provide inspiration for the icy road community.]]></description>
      <pubDate>Wed, 07 May 2025 08:53:07 GMT</pubDate>
      <guid>https://trid.trb.org/View/2529638</guid>
    </item>
    <item>
      <title>Heat-Induced Healing Potential of Bituminous Mixtures: Role of Mixture Parameters and Heating Method</title>
      <link>https://trid.trb.org/View/2526611</link>
      <description><![CDATA[Healing of cracked bituminous mixes/layers by heating them is considered an effective pavement maintenance strategy in recent times. This study aims to investigate the heat-induced healing ability of cracked bituminous mix specimens prepared with dense and gap gradations and using both unmodified and modified binders. Damaged mix specimens were healed by heating them to different temperatures (60°C, 80°C, 100°C, and 120°C) using induction as well as microwave methods of heating, and optimum heating temperatures were identified for different mixes. The influence of different binder parameters, such as surface free energy, saturates, aromatics, resins, and asphaltenes (SARA) fractions, and binder film thickness on the healing capacity of different mixes heated by different methods, has been demonstrated in this study. Gap-graded mixtures had better healing characteristics due to their larger binder volumes. Empirical models were developed for the estimation of the healing capacity of different mixes (with different aggregate gradations, binder type, and binder contents) for both microwave (R²=0.93 and Se/Sy=0.28) and induction (R²=0.92 and Se/Sy=0.26) methods of heating. A model was also proposed to obtain the optimum heating temperature as a function of viscosity and film thickness of the binder (R²=0.70 and Se/Sy=0.58). In both the heating methods, recovery of the indirect tensile strength (ITS) of different mixes (range of 0.3 to 0.8) varied widely with the gradation and binder of the mix. However, for a given mix and set of heating conditions, the microwave heating method resulted in better healing compared with the induction method due to the greater uniformity of heating and longer retention of heat. This, indeed, could be ascribed to the microwave susceptibility of the aggregates possessing significant dielectric properties, i.e., a dielectric constant of 5.69 and a loss factor of 0.46. The study presents the necessary inputs and understanding to appreciate the influence of various mixture and heating method variables on the resulting healing of the mixes.]]></description>
      <pubDate>Tue, 29 Apr 2025 09:22:30 GMT</pubDate>
      <guid>https://trid.trb.org/View/2526611</guid>
    </item>
    <item>
      <title>Research of Induction Heating of a Turnout Rail at an Increased Frequency</title>
      <link>https://trid.trb.org/View/2407734</link>
      <description><![CDATA[During precipitation in the form of snow, as well as during temperature extremes, there is a high probability of ice formation, which impedes the free movement of the tongue rail over the heel chair. The paper presents information on the technology of high-frequency induction heating of turnouts, which can be used to develop the infrastructure of railway transport. The technology is based on resonant power transmission systems. Information on the principle of operation and a description of the design of the main units of the equipment are presented. On the basis of the developed scheme, the authors have developed and manufactured an experimental model of the system of direct induction point heating of the technological spot of the turnout chair. The results of calculations and testing of equipment operating in a resonant mode at an increased frequency for induction heating are presented. The calculated power of one induction heater coincides with the calculated parameters and is 350 W. This power is sufficient to heat the heel chair to 60 ℃ in 2 h. The operating frequency is 10 kHz, which increases the level of electrical safety. Heating occurs only in the heel chair and not in the inductor or in the ground on which the turnout is located, which eliminates its deformation. The technology of installation of equipment for induction heating of technological spots of a turnout can be carried out without taking the turnout out of operation, as well as replacing sleepers.]]></description>
      <pubDate>Wed, 19 Mar 2025 10:12:10 GMT</pubDate>
      <guid>https://trid.trb.org/View/2407734</guid>
    </item>
    <item>
      <title>Advancing Durability in Transportation Infrastructure through Practical Implementation of Thermal Prestressing</title>
      <link>https://trid.trb.org/View/2491019</link>
      <description><![CDATA[During this industry partnership project, Transportation Infrastructure Precast Innovation Center (TRANS-IPIC) researchers will collaborate with industry experts to investigate the implementation of a new technology for prestressing concrete elements used in transportation infrastructure through the heating of shape memory alloy (SMA) bars. The research team will explore the idea of prestressing transportation precast components such as columns, beams, railroad ties, bridge decks, pavement, etc. to eliminate cracking and improve their durability and resilience. This concept has been tested on a small laboratory scale. It is yet to be tested and implemented practically on a large scale. The team will investigate the application of electrical resistivity to induce internal self-stressing in critical infrastructure components. The team will also explore the possibility of inductively heating prestressing SMA bars with no physical contact. To do so, the team will undertake the design, testing, and evaluation of an inductive heating system that can selectively heat the metal in a reinforced concrete structure without excessively heating the concrete (keeping in mind maintaining the hydration level in the concrete). To enable quick and effective activation, the team envisions the potential design, which involves using portable induction machines capable of moving exteriorly along the beam to induce heat in the SMA.]]></description>
      <pubDate>Wed, 22 Jan 2025 11:45:28 GMT</pubDate>
      <guid>https://trid.trb.org/View/2491019</guid>
    </item>
    <item>
      <title>An eco-friendly method for removal damaged asphalt pavement from steel bridge deck by induction heating</title>
      <link>https://trid.trb.org/View/2464092</link>
      <description><![CDATA[The induction heating in-place removal (IHIR) method for the steel bridge deck asphalt pavement layer (SBDPL) has the characteristics of economy, low pollution, and residue-free. However, the interlayer heating temperature (IHT) between the SBDPL and steel bridge deck is the critical factor in limiting the removal effects. In this study, an experimental platform for induction heating the SBDPL was established by simplifying the steel bridge structure. The incremental pattern of interlayer heating temperature was investigated to find the optimal start time for removal the SBDPL, thus ensuring the removal effects of the IHIR method. At the same time, the pollutants generated by traditional bridge deck pavement removal methods and the environment benefits of IHIR methods have been analyzed. The IHIR method has significant benefits in terms of economy, energy conservation, and reducing pollutant emissions. It reduces spending by 65 %, greenhouse gas emissions by 91 % and noise pollution by 30 %. This research can highly guide the actual application of IHIR method, to reduce the noise and dust emissions, energy consumption during urban construction processes.]]></description>
      <pubDate>Wed, 18 Dec 2024 12:01:01 GMT</pubDate>
      <guid>https://trid.trb.org/View/2464092</guid>
    </item>
    <item>
      <title>Research on the Induction Heating Thermal Properties of Asphalt Concrete via Pixel-Level Analysis</title>
      <link>https://trid.trb.org/View/2422576</link>
      <description><![CDATA[Induction heating of asphalt concrete has the characteristics of high crack repair efficiency and environmental sustainability. However, the uneven temperature distribution and local overheating obstruct its widespread application. Therefore, this paper conducted a pixel-level quantitative analysis of the temperature distribution characteristics and local overheating phenomenon on both the upper and side surfaces of asphalt concrete with different steel fiber (SF) contents after continuous heating. The temperature distribution was visualized by three-dimensional (3D) heat maps and violin maps. The uniformity of temperature was analyzed by the slope absolute value of the linear fitting results and the ratio of the interquartile range to the range. Results indicated that high SF content accelerated the heating rate of asphalt concrete but decreased the temperature uniformity. Localized overheating caused thermal expansion damage in asphalt mixtures, and the sample with 10% SF had both 304.2°C (maximum) and 79.7°C (minimum) upper surface temperatures at 60 s of heating, with local structural disintegration of the mixture. Higher heating uniformity and faster heating rates were achieved for samples with 6% SF content. The heating rate decreased with increasing heating time. The upper surface of the sample with 8% SF can be heated up the fastest (2.28°C/s). It is recommended that the maximum temperature of the upper surface be controlled during induction heating to avoid thermal damage. This proposal provides a reference for the practical application of induction heating technology.]]></description>
      <pubDate>Thu, 19 Sep 2024 09:14:11 GMT</pubDate>
      <guid>https://trid.trb.org/View/2422576</guid>
    </item>
    <item>
      <title>Enhancing self-healing of asphalt mixtures containing recycled concrete aggregates and reclaimed asphalt pavement using induction heating</title>
      <link>https://trid.trb.org/View/2401298</link>
      <description><![CDATA[Given the growing demand for sustainable road construction materials, this research aims to evaluate the synergistic effects of incorporating recycled concrete aggregate (RCA) and reclaimed asphalt pavement (RAP) in asphalt mixtures. Induction heating was also utilized to enhance the self-healing ability of asphalt mixtures, with the intention of prolonging their lifespan and mitigating environmental impacts. This research assessed the pavement performance of recycled asphalt mixtures (RAM) with different RCA and RAP dosages. The induction heating performance, cooling performance, and effective heating depth of RAM were tested. Lastly, the cumulative healing efficiency of the RAM was evaluated under multiple "fracture-healing" conditions. Findings indicated that the inclusion of RCA and RAP negatively influenced the water stability, high-temperature deformation resistance, and crack resistance at low temperatures of the RAM. However, when the RCA content was 20 % and the RAP content did not exceed 20 %, the road performance of the RAM met the requirements. The contents of the RCA and RAP had no discernible effect on the RAM's induction heating capability. Moreover, when the RCA content was 20 % and the RAP content did not exceed 10 %, the effective heating depth of the RAM could reach 50 mm. Using fracture energy recovery rate as the healing index, after three cycles of "fracture-healing", the RAM with 20 % RCA achieved the highest cumulative healing efficiency of 291 %. The cumulative healing efficiency of recycled asphalt mixtures with 20 % RCA and 10 % RAP was close to that of normal asphalt mixtures. This research contributes to reducing the consumption of non-renewable resources, minimizing environmental impact, and maintaining or even improving the performance of asphalt pavements by optimizing the use of RCA and RAP.]]></description>
      <pubDate>Thu, 25 Jul 2024 10:31:28 GMT</pubDate>
      <guid>https://trid.trb.org/View/2401298</guid>
    </item>
    <item>
      <title>The void characteristics of cement emulsified bitumen mixture under microwave heating by X-ray computed tomography</title>
      <link>https://trid.trb.org/View/2364347</link>
      <description><![CDATA[Excessive void content is an essential reason for the poor road performance of cement emulsified bitumen mixture (CEBM), while incorporating steel slag with high microwave responsiveness into CEBM and followed by microwave heating may be an effective method to reduce void content. To verify this hypothesis, this paper investigated the effect of microwave heating on the void characteristics of CEBM using X-ray computed tomography. The study mainly focused on the distribution characteristics of different-sized voids, the distribution uniformity of voids, and the shape characteristics of voids. The results revealed that the number of different-sized voids decreased significantly after microwave heating, especially the number of small-sized voids decreased the most. The reduction in void number improved the distribution uniformity of longitudinal and radial voids. However, it reduced the distribution uniformity of voids between the inner and outer sections of the specimen. Through the analysis of aggregate movement characteristics, it was found that the increase in the separation degree of inner and outer voids was due to the larger-sized aggregates being more efficiently distributed on the outer section of the specimen. Additionally, microwave heating reduced the complexity of void shapes. The reduction of void number and the improvement of void characteristics by microwave heating are expected to enhance the structural durability of CEBM, thereby improving its road performance.]]></description>
      <pubDate>Tue, 30 Apr 2024 09:08:17 GMT</pubDate>
      <guid>https://trid.trb.org/View/2364347</guid>
    </item>
    <item>
      <title>Investigation on the temperature distribution characteristics of steel slag asphalt mixture under different microwave heating and cooling methods</title>
      <link>https://trid.trb.org/View/2364041</link>
      <description><![CDATA[The utilization of steel slag aggregate (SSA) can enhance the microwave absorption efficiency of asphalt mixture, thus increasing its temperature and self-healing capability. In this study, the temperature distribution of basalt porous asphalt concrete (PAC-B), ordinary steel slag porous asphalt concrete (PAC-US), and modified steel slag porous asphalt concrete (PAC-MS) under the influence of different microwave heating and cooling methods were investigated through laboratory tests and numerical simulations. The heating methods including continuous heating, and two intermittent heating methods were used. Using the Monte Carlo method, three-dimensional mesoscopic numerical models were developed to simulate the microwave heating and cooling processes. The temperature of both the aggregates and asphalt mortar were analyzed, considering the influence of particle size on the aggregate temperature. The results revealed that the average inner heating rate of the three specimens is higher than the average surface heating rate. The average surface and inner heating rates of PAC-MS were higher than those of PAC-US and PAC-B. The average surface temperature and inner temperature during the heating process changed linearly, while nonlinear temperature variations were observed during the subsequent cooling phase. Increasing the number of cooling intervals during heating resulted in a more uniform temperature distribution within steel slag aggregate specimens. The results of numerical simulation indicated that the maximum temperature of aggregate was greater than that of asphalt mortar. During the cooling process, the highest temperature of the aggregate continuously decreased, whereas the lowest temperature initially increased before decreasing. The highest average volume temperature for various particle sizes was observed within the range of 4.75–9.5 mm. The laboratory test results were effectively validated by the numerical simulations.]]></description>
      <pubDate>Tue, 30 Apr 2024 09:08:17 GMT</pubDate>
      <guid>https://trid.trb.org/View/2364041</guid>
    </item>
    <item>
      <title>A state-of-the-art review and prospectives on the self-healing repair technology for asphalt materials</title>
      <link>https://trid.trb.org/View/2356034</link>
      <description><![CDATA[This paper summarizes the important research results of self-healing technology of asphalt materials, analyzes the healing mechanism of self-healing technology, and emphatically introduces the research status, advantages and disadvantages of five advanced self-healing technologies: Electromagnetic induction heating (EIH) technology, Microwave induction heating (MIH) technology, Photorepair method, Microcapsule method, and Hollow fiber (HF) method. The results showed that the existing self-healing mechanism is mainly based on surface energy theory, molecular diffusion theory and capillary flow theory, which explains the self-healing phenomenon of asphalt from different scales. The existing self-healing technology has developed rapidly, and the indoor research proves that the potential of MIH technology is higher than that of EIH technology. The repair potential of HF method is higher than that of microcapsule technology, but its material synthesis is more complicated. Photorepair technology has the potential to cooperate with other technologies, and it needs to be reasonably matched and selected. At the same time, the progress of related self-healing construction machinery and technology may require the continuous efforts of researchers. In addition, the organic synergy between different self-healing technologies may be a feasible way for self-healing technology to move from experimental section to practical application. In the future, a set of self-healing system with strong repair effect, environmental friendliness and reasonable cost can be established from the organic synergy of various self-healing technologies, combined with life cycle cost and intelligent sensors.]]></description>
      <pubDate>Fri, 19 Apr 2024 09:38:52 GMT</pubDate>
      <guid>https://trid.trb.org/View/2356034</guid>
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