Journal of Road Engineering最新文献_第3页

Roller-compacted geopolymer concrete mixes with recycled asphalt pavement material 碾压地聚合物混凝土与再生沥青路面材料混合

Journal of Road Engineering

Pub Date : 2025-03-01 DOI: 10.1016/j.jreng.2024.09.002

Avinash Talkeri , Raghuram Chinnabhandar , Harish Sagar

The performance of roller compacted concrete (RCC) was greatly influenced by variations in material proportion, optimum moisture content, density of mixes and methodology adopted making it different from conventional concrete mixes. Even though RCC has gained popularity, the complex phenomenon involved in developing the RCC mixes limits it from large-scale applications. In this study, reclaimed asphalt pavement (RAP) incorporated roller-compacted geopolymer concrete (RGC) mixes were developed herein with different compaction techniques such as vibratory hammer (VH), modified proctor (MP), vibration table (VT) and compression machine (CM) are studied and compared with control mixes of natural aggregates. Initially, the effect of alkali solutions such as sodium hydroxide (SH) and sodium silicate (SS) on the physical properties. During, the second phase mechanical properties such as dry density, compressive, flexural and split-tensile strength, modulus of elasticity and microstructure properties will be investigated. The test results revealed that compaction efforts were greatly influenced by the alkali solution. Furthermore, the poor bond characteristics between RAP and the binder matrix had a significant effect on strength properties. Also, the various compaction techniques affected the mechanical properties of mixes developed herein. In Comparison with various compaction efforts, VH and MP produced comparable results, whereas the VT method underestimated and overestimated the various strength properties. Although, the CM method reports comparable results but difficult to maintain consistency in strength aspects. Therefore, optimization of various parameters influencing the concrete properties needs to be achieved for field density.

碾压混凝土（RCC）的性能受材料配比、最佳含水率、配合比密度和不同于常规混凝土配合比的方法的影响很大。尽管碾压混凝土越来越受欢迎，但碾压混凝土混合料开发过程中的复杂现象限制了它的大规模应用。本研究采用振动锤（VH）、改性普罗托（MP）、振动台（VT）和压缩机（CM）等不同的压实技术，研制了含有碾压型地聚合物混凝土（RGC）的再生沥青路面（RAP），并与天然骨料的控制混合料进行了比较。最初，碱溶液如氢氧化钠（SH）和硅酸钠（SS）对物理性能的影响。在此期间，将研究第二阶段的力学性能，如干密度、压缩、弯曲和劈裂拉伸强度、弹性模量和微观结构性能。试验结果表明，碱溶液对压实力的影响较大。此外，RAP与粘结剂基体之间的粘结特性较差，对强度性能有显著影响。此外，各种压实技术影响了本文开发的混合料的力学性能。在与各种压实效果的比较中，VH和MP产生了相似的结果，而VT方法低估和高估了各种强度特性。虽然，CM方法报告了可比较的结果，但难以保持强度方面的一致性。因此，对于场密度，需要对影响混凝土性能的各参数进行优化。

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引用次数: 0

A comprehensive state-of-art review on the use of rejuvenators in asphalt pavement 沥青路面再生剂的应用现状综述

Journal of Road Engineering

Pub Date : 2025-03-01 DOI: 10.1016/j.jreng.2024.10.001

Basant Bhatt, Shenghua Wu

The utilization of reclaimed asphalt pavement (RAP) in asphalt mixtures has gained momentum in recent years, yet concerns persist regarding the long-term performance and binder properties of high RAP content mixtures. To overcome these challenges, rejuvenators have emerged as a promising solution to enhance the properties of aged asphalt binders and improve the overall performance of asphalt mixtures. This paper provides a comprehensive state-of-the-art review of rejuvenator technology and its potential to enhance the performance and sustainability of asphalt pavements. Rejuvenators are additives used to restore the properties of aged asphalt binders, particularly when incorporating high percentages of RAP. The performance of these additives varies based on their origin, and different methods can be used to analyze the rejuvenation process. Since proper specifications for rejuvenators are not available, blending charts are used to determine the optimum dosage of rejuvenators. However, proper blending must be achieved to maximize results and reduce the effect of black rock. Laboratory tests and some field performance studies on rejuvenated aged asphalt binders and RAP mixtures have shown improved or similar performance compared to virgin materials. Additionally, the use of rejuvenators has been observed to reduce construction costs, suggesting that this is a cost-effective technology for asphalt pavements. While rejuvenators show promise in improving the performance of pavements with recycled materials, challenges remain regarding optimization, long-term durability, and environmental effects. This review paper also identifies key areas for future research, including life-cycle cost analyses, comprehensive environmental impact assessments, and long-term field performance monitoring.

近年来，再生沥青路面（RAP）在沥青混合料中的应用势头强劲，但人们对高RAP含量混合料的长期性能和粘结剂性能的担忧仍然存在。为了克服这些挑战，再生剂已经成为一种很有前途的解决方案，可以提高老化沥青粘合剂的性能，改善沥青混合物的整体性能。这篇论文提供了一个全面的最新的回顾，再生技术及其潜力，以提高沥青路面的性能和可持续性。再生剂是一种用于恢复老化沥青粘合剂性能的添加剂，特别是当RAP含量较高时。这些添加剂的性能因其来源而异，可以使用不同的方法来分析回春过程。由于没有适当的回春剂规格，因此使用混合图表来确定回春剂的最佳剂量。然而，必须实现适当的混合，以最大限度地提高效果，减少黑岩的影响。实验室测试和一些现场性能研究表明，与原始材料相比，恢复老化的沥青粘合剂和RAP混合物的性能有所改善或相似。此外，使用再生剂可以降低施工成本，这表明这是一种具有成本效益的沥青路面技术。虽然返老还童在改善使用回收材料的路面性能方面表现出了希望，但在优化、长期耐久性和环境影响方面仍然存在挑战。这篇综述论文还确定了未来研究的关键领域，包括生命周期成本分析、综合环境影响评估和长期现场性能监测。

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引用次数: 0

Impact of pavement friction decay on speed limits and autonomous vehicles: A theoretical and experimental study 路面摩擦衰减对限速和自动驾驶汽车的影响：理论和实验研究

Journal of Road Engineering

Pub Date : 2025-03-01 DOI: 10.1016/j.jreng.2024.09.001

Filippo Giammaria Praticò

Commonly, the standards for the geometric design of roads refer to a given set of values for the friction coefficient (longitudinal and transverse friction). These "reference" values imply corresponding visibility sights, curvature radii, and speed limits. Unfortunately, not only do these reference values not correspond to a given standard to measure them, but nothing is said about the decrease of the posted speed limit (variable speed limits) when roads become slippery and lanes for autonomous vehicle (AV) are concerned.

Furthermore, the same assessment of the friction coefficient has plenty of uncertainties due to measurement device, temperature, location, time passed from the construction, alignment-related variables (e.g., curve, tangent, transition curve, convexity/crests or concavity/sags, longitudinal slope, superelevation, and ruling gradient), and supplementary singularities such as joints and bridge approaches. All the issues above may harm road safety and the complexity of forensic investigations of pavements.

Consequently, this study's objectives were confined to (1) carrying out friction measurements and analyzing the problem of friction decay over time; (2) setting up a method to lower the speed limits where friction decays are detected; (3) setting up a method to handle friction decays for autonomous vehicles. Results demonstrate that: (1) a power law describes how the speed limits are affected by friction; (2) for speeds up to 170 km/h, due to the lower reaction time, AV reaction distance is lower, which benefits AV traffic (lower stopping distance); (3) on the contrary, for higher values of friction and higher speeds, under the hypothesis of having the same reaction time law for non-AV (NAV) (i.e., decreasing with the initial speed), AV speed limits become lower than NAV speed limits; (4) not only do comfort-based speed profiles for AVs bring higher braking distances, but also, in the median part (of the deceleration process), this could pose safety issues and reduce the distance between the available and the needed friction.

通常，道路几何设计的标准是指一组给定的摩擦系数值（纵向和横向摩擦）。这些“参考”值意味着相应的能见度、曲率半径和速度限制。不幸的是，这些参考值不仅不符合给定的标准来衡量它们，而且没有提到当道路变湿和自动驾驶汽车（AV）车道时张贴的速度限制（可变速度限制）的减少。此外，由于测量设备、温度、位置、施工时间、对齐相关变量（如曲线、切线、过渡曲线、凸/峰或凹/凹陷、纵向坡度、超高程和控制梯度）以及附加奇点（如接缝和桥梁接近），对摩擦系数的相同评估存在大量不确定性。所有这些问题都可能危害道路安全，并增加路面法医调查的复杂性。因此，本研究的目标仅限于：(1)进行摩擦测量并分析摩擦随时间衰减的问题；(2)建立检测到摩擦衰减时降低限速的方法；(3)建立自动驾驶汽车的摩擦衰减处理方法。结果表明：(1)一个幂律描述了摩擦对限速的影响；(2)车速在170 km/h以下时，由于反应时间较短，自动驾驶汽车的反应距离较短，有利于自动驾驶交通（停车距离较短）；(3)相反，在摩擦力越大、速度越快的情况下，在非自动驾驶汽车（NAV）反应时间规律相同的假设下（即随着初始速度的增加而减小），自动驾驶汽车的限速值低于自动驾驶汽车的限速值；(4)基于舒适性的自动驾驶汽车速度配置不仅会带来更高的制动距离，而且在（减速过程的）中间部分，这可能会带来安全问题，并减少可用摩擦与所需摩擦之间的距离。

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引用次数: 0

Nonlinear rheological behavior of asphalt based on large amplitude oscillation shear test under different loading, aging, and modification conditions 基于大振幅振荡剪切试验的沥青在不同荷载、老化和改性条件下的非线性流变特性

Journal of Road Engineering

Pub Date : 2025-03-01 DOI: 10.1016/j.jreng.2024.12.001

Jiaqiu Xu , Zijia Wang , Zepeng Fan , Junfu Liu , Guoyang Lu , Dawei Wang

To reveal the effects of environmental and loading conditions, as well as asphalt properties on the nonlinear rheological behavior of asphalt, the large amplitude oscillation shear (LAOS) test was introduced, and the Fourier transform rheology, Lissajous curve method, and the LAOS fatigue test have been applied to investigate the nonlinear rheological behavior of asphalt binders. The research results indicate that a decrease in temperature, an increase in shear frequency and strain level, the introduction of polymer modifiers, and the aging effect of asphalt can significantly increase the nonlinearity of asphalt, manifested by the higher relative magnitude of the third harmonic and zero-strain nonlinear coefficient. For the two polymer modifiers selected in this study, the 4% polyurethane modifier exhibits a higher nonlinear lifting effect than the 4% styrene-butadiene-styrene (SBS). The impact of long-term aging on nonlinear viscoelasticity is observably greater than that of short-term aging. The zero-strain nonlinear coefficient estimated based on the average value method can accurately characterize the nonlinear viscoelasticity of asphalt, which can serve as an effective supplement to the relative magnitude of the third harmonic. All asphalts exhibit shear thinning behavior under the test temperature of 24 °C, and the decrease in test temperature, the increase in shear rate and strain level, the introduction of modifiers, and the aging effect of asphalt all exacerbate the shear thinning behavior of asphalt. In addition, the fatigue failure process of asphalt materials is accompanied by an increasing degree of nonlinearity.

为了揭示环境、荷载条件以及沥青性能对沥青非线性流变特性的影响，引入了大振幅振荡剪切（large amplitude振荡shear， LAOS）试验，并应用傅里叶变换流变学、Lissajous曲线法和LAOS疲劳试验研究了沥青粘结剂的非线性流变特性。研究结果表明，温度的降低、剪切频率和应变水平的提高、聚合物改性剂的引入以及沥青的老化效应都能显著增加沥青的非线性，表现为三次谐波和零应变非线性系数的相对幅度增大。对于本研究选择的两种聚合物改性剂，4%聚氨酯改性剂比4%丁苯乙烯改性剂（SBS）具有更高的非线性提升效应。长期老化对非线性粘弹性的影响明显大于短期老化。基于平均值法估计的零应变非线性系数可以准确表征沥青的非线性粘弹性，可以作为三次谐波相对量级的有效补充。试验温度为24℃时，所有沥青均表现出剪切减薄行为，试验温度的降低、剪切速率和应变水平的提高、改性剂的引入以及沥青的老化效应均加剧了沥青的剪切减薄行为。此外，沥青材料的疲劳破坏过程伴随着非线性程度的增加。

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引用次数: 0

Mechanical response analysis of asphalt pavement considering top-down crack based on FDM-DEM coupling simulation 基于FDM-DEM耦合仿真的考虑自上而下裂缝的沥青路面力学响应分析

Journal of Road Engineering

Pub Date : 2025-03-01 DOI: 10.1016/j.jreng.2024.07.004

Min Wang , Xin Yu , Chen Chen

The occurrence of top-down (TD) cracking has gradually become a prevalent issue in semi-rigid base asphalt pavements after prolonged service. A coupled simulation model integrating the finite difference method (FDM) and discrete element method (DEM) was employed to investigate the mechanical behavior of asphalt pavement containing a pre-existing TD crack. The mesoscopic parameters of the model were calibrated based on the mixture modulus and the static mechanical response on the MLS66 test road. Finally, an analysis was performed to assess how variations in TD crack depth and longitudinal length affect the distribution patterns of transverse tensile stress, vertical shear stress, and vertical compressive stress. The results indicate that the vertical propagation of TD crack significantly increases both the tensile stress value and range on the middle surface, while the longitudinal development of TD crack has minimal impact. This phenomenon may result in more severe fatigue failure on the middle surface. With the vertical and longitudinal development of TD crack, the vertical shear stress and compressive stress show obvious "two-stage" characteristics. When the crack's vertical length reaches 40 mm, there is a sharp increase in stress on the upper surface. As the crack continues to propagate vertically, the growth of stress on the upper surface becomes negligible, while the stress in the middle and lower layers increased significantly. Conversely, for longitudinal development of TD crack, any changes in stress are insignificant when their length is less than 180 mm; however, as they continue to develop longitudinally beyond this threshold, there is a sharp increase in stress levels. These findings hold great significance for understanding pavement structure deterioration and maintenance behavior associated with TD crack.

半刚性基层沥青路面在长期使用后，自顶开裂已逐渐成为普遍存在的问题。采用有限差分法（FDM）和离散元法（DEM）相结合的耦合仿真模型，研究了含TD裂缝沥青路面的力学行为。基于混合料模量和MLS66试验路面的静态力学响应，对模型的细观参数进行了标定。最后，分析了TD裂缝深度和纵向长度的变化对横向拉应力、垂直剪应力和垂直压应力分布规律的影响。结果表明：纵向裂纹的扩展显著增加了中间表面的拉应力值和范围，而纵向裂纹的扩展对中间表面的拉应力影响较小；这种现象可能导致中间表面更严重的疲劳破坏。随着TD裂缝纵向和纵向的发展，竖向剪应力和压应力表现出明显的“两阶段”特征。当裂缝垂直长度达到40 mm时，上表面应力急剧增大。随着裂纹继续垂直扩展，上表面应力的增长可以忽略不计，而中下层应力的增长则显著增加。相反，对于TD裂纹的纵向发展，当其长度小于180 mm时，应力变化不显著；然而，随着他们继续纵向发展超过这个阈值，压力水平急剧增加。这些研究结果对于理解路面结构退化与养护行为与TD裂缝的关系具有重要意义。

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引用次数: 0

Models and methods for dynamic response of 3D flexible and rigid pavements to moving loads: A review by representative examples 三维柔性和刚性路面在移动荷载作用下的动力响应模型和方法：典型实例综述

Journal of Road Engineering

Pub Date : 2025-03-01 DOI: 10.1016/j.jreng.2024.07.003

Edmond V. Muho , Niki D. Beskou , Jiang Qian

This work reviews models and methods for determining the dynamic response of pavements to moving vehicle loads in the framework of continuum-based three dimensional models and linear theories. This review emphasizes the most representative models and methods of analysis in the existing literature and illustrates all of them by numerical examples. Thus, 13 such examples are presented here in some detail. Both flexible and rigid (concrete) pavement models involving simple and elaborate cases with respect to geometry and material behavior are considered. Thus, homogeneous or layered half-spaces with isotropic or cross-anisotropic and elastic, viscoelastic or poroelastic properties are considered. The vehicles are modeled as simple point or distributed loads or discrete spring-mass-dashpot system moving with constant or variable velocity. The dynamic response of the above pavement-vehicle systems is obtained by analytical/numerical or purely numerical methods of solution. Analytical/numerical methods have mainly to do with Fourier transforms or complex Fourier series with respect to both space and time. Purely numerical methods involve the finite element method (FEM) and the boundary element method (BEM) working in time or frequency domain. Critical discussions on the advantages and disadvantages of the various pavement-vehicle models and their methods of analysis are provided and the effects of the main parameters on the pavement response are determined through parametric studies and presented in the examples. Finally, conclusions are provided and suggestions for future research are made.

本文综述了在基于连续体的三维模型和线性理论的框架下确定路面对移动车辆荷载的动态响应的模型和方法。本文着重介绍了现有文献中最具代表性的模型和分析方法，并通过数值实例加以说明。因此，这里详细介绍了13个这样的例子。柔性和刚性（混凝土）路面模型涉及简单和复杂的情况下，有关几何和材料的行为被考虑。因此，具有各向同性或交叉各向异性和弹性、粘弹性或孔弹性性质的均匀或分层半空间被考虑在内。将车辆建模为简单的点荷载或分布荷载或离散的弹簧-质量-阻尼系统，以恒定或变速度运动。上述路面-车辆系统的动力响应采用解析/数值或纯数值方法求解。解析/数值方法主要与傅里叶变换或复傅里叶级数有关的空间和时间。纯数值方法包括时域和频域的有限元法和边界元法。重点讨论了各种路面-车辆模型及其分析方法的优缺点，并通过参数研究确定了主要参数对路面响应的影响，并给出了实例。最后，本文给出了结论，并对未来的研究提出了建议。

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引用次数: 0

Investigation of the effect of particle composition on its distribution homogeneity in aggregate blend using discrete element method 用离散元法研究混合料中颗粒组成对其分布均匀性的影响

Journal of Road Engineering

Pub Date : 2025-03-01 DOI: 10.1016/j.jreng.2024.07.001

Weixiao Yu , Sudi Wang , Zhenlong Gong , Yinghao Miao

The homogeneity of aggregate blend has a significant influence on the performance of asphalt mixture. The composition of aggregate blend, including the size combination and the mass ratio between each size particles (MRESP), is an important factor affecting the homogeneity. This study investigated the influence of the size combination and MRESP on the distribution homogeneity of particles in aggregate blend using discrete element method (DEM). An indicator quantifying the distribution homogeneity was established according to the coefficient of variation (CV) for particle number. Two-size, three-size, and four-size aggregate blends with various compositions were designed. Laboratory tests show the DEM simulation is feasible. The particle distribution homogeneity in various blends was analyzed. The results showed the distribution homogeneity of each size particles in a blend is closely related to their mass fraction. The higher the mass fraction of the particles, the more homogeneous the distribution of them. The MRESP has no significant influence on the homogeneity of the blend composed of only coarse aggregates. However, the homogeneity of the blend composed of coarse and fine aggregates improves gradually with the increase of the mass fraction of fine aggregates. The smaller the maximum particle size in a blend, the better the homogeneity. It is suggested that the mass fraction of fine aggregates should be between 33% and 50% for achieving good homogeneity of aggregate blends. The research results can provide a reference for gradation design of asphalt mixture.

骨料混合料的均匀性对沥青混合料的性能有重要影响。骨料共混物的组成，包括粒径组合和各粒径颗粒之间的质量比（MRESP），是影响其均匀性的重要因素。采用离散元法（DEM）研究了粒径组合和MRESP对骨料混合料中颗粒分布均匀性的影响。根据颗粒数变异系数（CV），建立了一种量化颗粒分布均匀性的指标。设计了不同成分的二粒径、三粒径和四粒径骨料共混物。实验结果表明，数值模拟是可行的。分析了不同共混物中颗粒分布的均匀性。结果表明，共混物中各粒径颗粒的分布均匀性与其质量分数密切相关。粒子的质量分数越高，它们的分布就越均匀。MRESP对仅由粗集料组成的共混料的均匀性无显著影响。粗细骨料混合料的均匀性随着细骨料质量分数的增加而逐渐改善。共混物的最大粒径越小，均匀性越好。建议细集料的质量分数应在33% ~ 50%之间，以达到良好的集料共混均匀性。研究结果可为沥青混合料级配设计提供参考。

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引用次数: 0

Review on composition properties, functionalization of bio-oil and its rejuvenation behavior and mechanism on aged asphalt 生物油的组成、性能、功能化及其在老化沥青上的再生行为和机理综述

Journal of Road Engineering

Pub Date : 2025-03-01 DOI: 10.1016/j.jreng.2024.07.002

Peilong Li , Lei Yue , Zhan Ding , Xiuming Jiang , Huifeng Li , Linyu An , Chenxi Tian

The objective of this paper is to comprehensively review the research progress of bio-oil properties and hot rejuvenation behavior and mechanism to aged asphalt. The preparation process, composition characteristics of bio-oils and their component correspondence with petroleum asphalt were compared. The diffusion and fusion effects of various bio-oils in aged asphalt were introduced. Bio-oil cannot be used as a direct alternative of petroleum asphalt, but it has the potential to effectively rejuvenate aged asphalt binders due to the component similarity with petroleum asphalt and good diffusion properties. For the asphalt rejuvenation, the functionalization treatment methods of bio-oil were discussed such as purification, composition modification and component conversion. The active groups and derivatives in bio-oil can be converted into the missing components of the aged binder through phenolate, grafting, polycondensation, resinifying, but the conversion process and mechanism are still unclear. From the perspectives of diffusion behavior, components regulation, dissolving asphaltene and micro-rejuvenation effect, the rejuvenation behavior and mechanism of bio-oil on aged asphalt were elaborated, and the effects of various types of bio-oil and aged asphalt on rejuvenation behavior were analyzed. The preparation process and dosage of bio-rejuvenator were summarized. The rejuvenation effects of bio-oil on aged asphalt were comprehensively investigated from the aspects of high and low temperature performances, rheological properties, microstructure and chemical composition of bio-rejuvenated asphalt binders. Finally, the limitations of bio-oil used as asphalt rejuvenators were discussed, and future research directions were prospected, which can provide reference and theoretical basis for the development of high-performance bio-oil rejuvenating agents and the engineering application of bio-oil to improve the properties of aged asphalt materials.

本文综述了生物油性能、老化沥青热再生行为及机理的研究进展。比较了生物油的制备工艺、组成特点及其与石油沥青组分的对应关系。介绍了各种生物油在老化沥青中的扩散和融合作用。生物油不能作为石油沥青的直接替代品，但由于其组分与石油沥青相似，且具有良好的扩散特性，因此具有有效修复老化沥青粘结剂的潜力。针对沥青再生，探讨了生物油的纯化、组分改性和组分转化等功能化处理方法。生物油中的活性基团和衍生物可以通过酚醛、接枝、缩聚、树脂化等途径转化为老化粘合剂中缺失的组分，但转化过程和机理尚不清楚。从扩散行为、组分调节、沥青质溶解和微再生效应等方面阐述了生物油对老化沥青的再生行为和机理，分析了不同类型生物油和老化沥青对再生行为的影响。综述了生物返老还老剂的制备工艺及用量。从生物再生沥青粘结剂的高低温性能、流变性能、微观结构和化学成分等方面全面研究了生物油对老化沥青的再生效果。最后，讨论了生物油作为沥青再生剂的局限性，并对未来的研究方向进行了展望，为开发高性能生物油再生剂和生物油改善老化沥青材料性能的工程应用提供参考和理论依据。

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引用次数: 0

Review on the properties and mechanisms of asphalt modified with bio-oil and biochar 生物油和生物炭改性沥青的性能及机理研究进展

Journal of Road Engineering

Pub Date : 2024-12-01 DOI: 10.1016/j.jreng.2024.06.001

Xinxing Zhou , Ziyang Zhang , Haopeng Wang , Meizhu Chen , Shaopeng Wu , Song Xu , Xinglin Zhou , Maoping Ran , Linglin Li , Guangjun Lu , Zhibin Ma

Bio-asphalt has a great application prospect in the replacement of petroleum-based asphalt to pave and maintain asphalt pavement. However, the problems of flow-induced crystallization and phase separation caused by flow-induced crystallization had severely restricted its application. This paper describes the progress of research on preparation, property evaluation and phase separation mechanism of bio-asphalt. The advantages and disadvantages of preparation methods of bio-asphalt are states. The fundamental physical and rheological properties of bio-asphalt are investigated, especially for flow-induced crystallization. There exists obvious flow-induced crystallization because bio-asphalt is rich in waxes that crystallize easily. Owing to the existence of excess biochar, bio-asphalt appears phase separation. A brief review of the effect of bio-oil and biochar on asphalt volatile organic compounds (VOCs) is presented. Research find that bio-oil/biochar are not only replenish the light components of asphalt, but also improve the flow-induced crystallization and phase separation of bio-asphalt. There exists synergistic effect of biochar and bio-oil in asphalt modification. Moreover, biochar can improve the durability of bio-oil modified asphalt, but excessive addition of biochar to bio-oil modified asphalt can cause phase separation. Adding an appropriate amount of bio-oil and biochar to asphalt can improve its high-temperature resistance, low-temperature crack resistance, and system compatibility.

生物沥青在替代石油基沥青铺装和养护沥青路面方面具有很大的应用前景。然而，流致结晶和流致结晶引起的相分离问题严重制约了其应用。介绍了生物沥青的制备、性能评价和相分离机理等方面的研究进展。生物沥青的制备方法有其优缺点。研究了生物沥青的基本物理和流变特性，特别是流动诱导结晶。由于生物沥青富含易结晶的蜡，因此存在明显的流致结晶现象。由于过量生物炭的存在，生物沥青出现相分离现象。综述了生物油和生物炭对沥青挥发性有机物（VOCs）的影响。研究发现，生物油/生物炭不仅补充了沥青的轻组分，而且改善了生物沥青的流动诱导结晶和相分离。生物炭与生物油在沥青改性中存在协同效应。此外，生物炭可以提高生物油改性沥青的耐久性，但生物油改性沥青中添加过多的生物炭会导致相分离。在沥青中加入适量的生物油和生物炭可以提高沥青的耐高温性、耐低温开裂性和体系相容性。

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引用次数: 0

Effectiveness of heat-reflective asphalt pavements in mitigating urban heat islands: A systematic literature review 热反射沥青路面缓解城市热岛的有效性：系统的文献综述

Journal of Road Engineering

Pub Date : 2024-12-01 DOI: 10.1016/j.jreng.2024.04.008

Tracy Leh Xin Wong , Ewe Loon Lim , Mohd Rosli Mohd Hasan , Oumar Orozi Sougui , Abdalrhman Milad , Xin Qu

Urban heat island (UHI) effect is a growing concern in numerous cities worldwide, which increases urban temperatures. Conventional asphalt pavements are a major contributor to the issue, causing environmental and health concerns. To tackle this issue, the implementation of cool pavements such as heat-reflective asphalt pavements has been introduced. This systematic literature review (SLR) thoroughly examines prior research to assess the effectiveness of heat-reflective asphalt pavements in reducing UHI effects. This SLR was conducted in accordance with the preferred reporting items for systematic review and meta-analysis (PRISMA) guidelines to enhance data reliability and minimize bias. This review process involved establishing review protocol, formulating review questions, systematically selecting articles through identification, screening, eligibility, quality appraisal, and data abstraction and analysis from various databases such as Scopus, Web of Science (WoS), Wiley, Taylor Francis, and ScienceDirect. Three primary themes and nine sub-themes were derived from the three review questions. From the results, heat-reflective asphalt pavements effectively minimized the UHI effect. However, their efficiency varies depending on factors such as pavement types, paving location, and use of cool materials. A comprehensive analysis examined heat-reflective pavement's mechanisms, benefits, and drawbacks. This investigation aimed to enhance comprehension and establish a robust basis for future studies in this field.

城市热岛效应（UHI）在全球许多城市日益受到关注，它使城市温度升高。传统的沥青路面是造成这个问题的主要原因，引起了环境和健康问题。为了解决这个问题，我们引入了冷却路面，如热反射沥青路面。这个系统的文献回顾（SLR）彻底检查了先前的研究，以评估热反射沥青路面在减少城市热岛效应方面的有效性。该SLR按照系统评价和荟萃分析（PRISMA）指南的首选报告项目进行，以提高数据可靠性并尽量减少偏倚。这一审查过程包括建立审查方案，制定审查问题，通过鉴定、筛选、合格性、质量评估以及从各种数据库（如Scopus、Web of Science （WoS）、Wiley、Taylor Francis和ScienceDirect）中提取和分析数据，系统地选择文章。三个审查问题衍生出三个主要主题和九个次级主题。从结果来看，热反射沥青路面有效地减少了热岛效应。然而，它们的效率取决于诸如路面类型、铺装位置和冷却材料的使用等因素。一项全面的分析研究了热反射路面的机理、优点和缺点。本研究旨在增进对该领域的理解，并为今后的研究奠定坚实的基础。

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