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Evaluation of Warm Mix Asphalt Mixtures Containing RAP Using Accelerated Loading Tests

机译:使用加速载荷试验评估含RAP的热拌沥青混合料

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This paper presents the results of a study that was conducted to evaluate the performance and constructability of warm mix asphalt (WMA) mixtures containing reclaimed asphalt pavement (RAP). Four sections were constructed at the indoor Accelerated Pavement Loading Facil ity at Ohio University. Aspha-min, Sasobit, and Evotherm WMA mixtures were used in the wearing course layer of the first three sections. In addition, the fourth section had a conventional hot mix asphalt (HMA) mixture, which was used as a control. Temperature was monitored during the production, placement, and compaction of WMA and HMA mixtures. Furthermore, emission tests were conducted at the asphalt plants during the production of each of the evaluated mixtures. Falling weight deflectometer (FWD) and rolling wheel tests were conducted at different temperatures on all evaluated sections. The results of this study showed that emissions were reduced during the production of the Aspha-min and Sasobit WMA mixtures by at least 50 % for volatile organic compounds, 60 % for carbon monoxide, 20 % for nitrogen oxides, and 83 % for sulfur dioxide, when compared to the control HMA mixture. In addition, although WMA mixtures were produced and compacted at much lower temperatures, they achieved better field densities than the control HMA mixture. The FWD test results showed that at 40°F (4°C) test temperature, the control HMA mixture had significantly lower stiffness than that of the WMA mixtures. However, the FWD stiffness measurement of the HMA and the WMA mixtures were statistically indistinguishable at the intermediate and high test temperatures of 70°F (21.1°C) and 104°F (40°C), respectively. Finally, the rolling wheel test results indicated that the three WMA sections, especially the Evotherm section, exhibited more rutting than the control HMA section during the post primary compaction stage. However, the rutting rate of the HMA section was higher than those of the WMA sections in the secondary stage, which suggests that the rutting difference may slowly be mitigated.
机译:本文介绍了一项研究结果,以评估含有再生沥青路面(RAP)的热拌沥青(WMA)混合物的性能和可施工性。俄亥俄州大学的室内加速路面装载设施建造了四个部分。在前三个部分的磨损层中使用了Aspha-min,Sasobit和Evotherm WMA混合物。另外,第四部分具有常规的热拌沥青(HMA)混合物,用作对照。在生产,放置和压实WMA和HMA混合物的过程中监控温度。此外,在每种评估混合物的生产过程中,在沥青厂进行了排放测试。落重偏折仪(FWD)和滚轮测试是在所有评估部分的不同温度下进行的。这项研究的结果表明,在生产Aspha-min和Sasobit WMA混合物的过程中,挥发性有机化合物的排放量减少了至少50%,一氧化碳减少了60%,氮氧化物减少了20%,二氧化硫减少了83%与对照HMA混合物相比。另外,尽管生产了WMA混合物并在低得多的温度下压实,但与对照HMA混合物相比,它们获得了更好的场密度。 FWD测试结果表明,在40°F(4°C)测试温度下,对照HMA混合物的刚度明显低于WMA混合物。但是,在70°F(21.1°C)和104°F(40°C)的中级和高温测试温度下,HMA和WMA混合物的FWD刚度测量在统计上是无法区分的。最后,滚轮测试结果表明,在初次压实阶段,三个WMA截面,特别是Evotherm截面,比对照HMA截面表现出更多的车辙。然而,在第二阶段,HMA部分的车辙率高于WMA部分的车辙率,这表明车辙差异可能会缓慢缓解。

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