Effectiveness of Vegetable Oils as Rejuvenators for Aged Asphalt Binders
Effectiveness of Vegetable Oils as Rejuvenators for Aged Asphalt Binders
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植物油作为老化沥青粘合剂再生剂的有效性
DOI：
10.1061/(asce)mt.1943-5533.0001769
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发表时间：
2017-03-01
影响因子：
3.2
通讯作者：
Sun, Lijun
中科院分区：
文献类型：
--
作者：
Ji, Jie;Yao, Hui;Sun, Lijun
传统的再生剂通常有大量的重油来供应沥青粘结剂中的轻油成分，在长期的老化过程中，轻油成分会减少。然而，重燃料油在较高的回收温度(180摄氏度以上)下很容易挥发，这导致再生沥青混合料中使用的再生沥青路面(RAP)材料的比例有限(再生率低于30%)。植物油含有丰富的不饱和脂肪酸，与轻油成分相似，具有更好的耐温性。因此，从沥青再生机理出发，利用植物油回收老化沥青结合料具有很大的潜力。在本研究中，使用两种用废弃烹饪植物油(玉米油和大豆油)代替重油的再生剂和一种商品再生剂来回收老化沥青(从说唱材料中提取)，其比例(按沥青重量计)分别为2、4、6、8和10%。采用动态剪切流变仪(DSR)和旋转粘度(RV)试验对回收沥青结合料的物理性能进行了评价。通过弯曲梁流变仪(BBR)试验对再生沥青结合料的低温性能进行了评价。室内试验和方差统计分析(ANOVA)结果表明，植物油再生剂能有效降低老化沥青结合料的粘度和刚性，既有利于疲劳，又有利于低温抗裂性。此外，该再生剂还可以降低植物油用量较大的老化沥青结合料的粘度和刚性。总体而言，考虑到沥青结合料在高温下的抗车辙能力，建议在再生剂中加入植物油含量(6%~8%)来恢复老化的沥青结合料。(C)2016年美国土木工程师学会。
Traditional rejuvenators normally have a great deal of heavy fuel oils to supply the light oil component of asphalt binders, which decreases throughout a long-term aging process. However, heavy fuel oils can easily volatilize at a high recycling temperature (above 180 degrees C), and this leads to a limited portion of reclaimed asphalt pavement (RAP) materials utilized in the recycled asphalt mixture (with a recycling rate less than 30%). Vegetable oils are rich in unsaturated fatty acids, which are similar to the light oil components, and have a better temperature resistance. Therefore, there is potential that vegetable oils can be utilized to recover the aged asphalt binder based on the asphalt rejuvenating mechanism. In this study, two rejuvenators with waste cooking vegetable oils (corn oil and soybean oil) to replace heavy oils and a commercial rejuvenator were used to recover the aged asphalt (extracted from RAP materials) with different ratios (by weight of asphalt) of 2, 4, 6, 8, and 10%. Dynamic shear rheometer (DSR) and rotational viscosity (RV) tests were used to evaluate the physical properties of the recovered asphalt binder. The low-temperature performance of the recovered asphalt binder was also evaluated by the bending beam rheometer (BBR) test. The laboratory tests and statistical analysis of variance (ANOVA) results show that the vegetable oil rejuvenators can effectively decrease the viscosity and stiffness of aged asphalt binder, which is beneficial for both fatigue and low-temperature cracking resistance. Furthermore, the rejuvenator can lower the viscosity and stiffness of the aged asphalt binder with a larger amount of vegetable oil. Overall, the vegetable oil content (6% to 8%) in the rejuvenator is proposed for recovering the aged asphalt binder in consideration of the rutting resistance under high temperatures. (C) 2016 American Society of Civil Engineers.