沥青混凝土磨损过程车辙损伤最小化的可能性

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2022-02-12 DOI:10.48084/etasr.4669
Hanady M. Abd Al Kareem, A. Albayati
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引用次数: 9

摘要

本文研究了重轴载频繁重复作用引起的沥青混凝土路面过度永久变形(车辙)问题。车辙随着附加载荷的施加而逐渐发展,并表现为车轮轨迹上的纵向凹陷。造成沥青路面车辙的原因有很多,如沥青搅拌不良、集料级配连续性差等。影响沥青-骨料混合料抗永久变形能力的所有因素都必须加以讨论,并且必须适当考虑所有因素,以降低沥青-骨料混合料的车辙倾向。在这项研究中,采用最常见的抗车辙技术生产了几种混合物(每种混合物使用最有效的添加剂),并将其性能与伊拉克目前使用的(常规)混合物进行了比较。试验的重点是沥青混凝土混合料的磨损路面。试验了不同类型的混合料,即两种不同沥青含量(4.7%和5.3%)的致密热沥青混合料(HMA)、开级摩擦层(OGFC)混合料、石胶泥沥青(SMA)混合料和Beton沥青a Module Eleve (BBME)。改性剂包括天然剑麻纤维(SFs)、碳纤维(CFs)和矿物填料(水合石灰,HL)。进行了马歇尔试验,以确定稳定性和流量值。通过对圆柱形试样在40℃和60℃两种温度下的反复载荷试验来评估车辙,获得永久变形参数。将这些参数作为VESYS 5W软件的输入,对7×10^6等效单轴载荷(ESALs)下不同设计寿命时期的车辙深度进行了评估。将所选混合物的结果与在伊拉克规范(SCRB,2003)范围内的实验室密级配混合工作混合公式(JMF)中设计的混合物进行比较。通过对本地混合料中常用的骨料级配的控制,JMF在抗车辙性能方面表现最好,在40℃和60℃时,与常规混合料相比,JMF的车辙深度分别减少了21.63mm和44.304mm。改变本地混合料的骨料级配,在不添加添加剂或改变沥青百分比的情况下,在相同的成本下,具有更好的抗车辙性能。
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The Possibility of Minimizing Rutting Distress in Asphalt Concrete Wearing Course
The excessive permanent deformation (rutting) in asphalt-concrete pavements resulting from frequent repetitions of heavy axle loads is studied in this paper. Rutting gradually develops with additional load applications and appears as longitudinal depressions in the wheel path. There are many causes of the rutting of asphalt roads, such as poor asphalt mixing and poor continuous aggregate gradation. All factors affecting the mixture resistance to permanent deformation must be discussed, and all must be properly considered to reduce the rutting propensity of asphalt-aggregate mixtures. In this study, several mixtures were produced with the most common techniques in rutting resistance (using the most effective additives for each mixture), and their performance was compared with the (conventional) mixture currently used in Iraq. The tests focused on the asphalt-concrete mixture for wearing courses. Different mixtures types were tried, namely, dense hot asphalt mixture (HMA) with two different asphalt contents (4.7% and 5.3%), Open-Grade Friction Course (OGFC) mixture, Stone Mastic Asphalt (SMA) mixture, and Beton Bitumineux a Module Eleve (BBME). The modifiers included natural Sisal Fibers (SFs), Carbon Fibers (CFs), and mineral filler (hydrated lime, HL). Marshall test was carried out to find stability and flow values. Rutting was evaluated by the repeated load test for cylindrical specimens under two temperatures (40°C and 60°C) to obtain the permanent deformation parameters. The parameters were used as input to the VESYS 5W software to evaluate the rut depth during different times of design life under 7×10^6 Equivalent Single Axle Loads (ESALs). The results of the selected mixtures were compared with the mixture designed in the laboratory dense gradation mix Job-Mix Formula (JMF)) within the limits of the Iraqi specification (SCRB,2003). Manipulation of the aggregate gradation that is customary in the implementation of the local mixture showed that the best performance regarding rutting resistance was exhibited by JMF, which decreased the rut depth at 40°C and 60°C by 21.63mm and 44.304mm respectively, in comparison with the conventional mixture. Changing the aggregate gradation of the local mixture gives better performance in rutting resistance without additives or changing the percentage of asphalt, at the same cost.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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