Zheng Xuewen, Xu Wenyuan, Xu Haoping, Wu Suxin, Cao Kai
School of Civil Engineering, Northeast Forestry University, Harbin 150040, China.
College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China.
ACS Omega. 2022 Jun 13;7(25):21736-21749. doi: 10.1021/acsomega.2c01810. eCollection 2022 Jun 28.
A real rejuvenator must have the ability to disaggregate oxidized asphaltene nanoclusters. However, few studies pay attention to the topic, and there is a lack of comparison of the disaggregation ability of different rejuvenators. Thus, the disaggregation ability and regeneration mechanism of three bio-rejuvenators (waste cooking oil (WCO), waste wood oil (WWO), and straw liquefied residue oil (SLRO)) on oxidized asphaltene nanoclusters were studied in this paper. Laboratory tests and molecular dynamics (MD) simulation were used to compare the effectiveness of the three bio-rejuvenators and reveal its corresponding mechanism. It is found that these bio-rejuvenators have a softening effect on aged asphalt binder, but not all of them can disaggregate oxidized asphaltene nanoclusters. The introduction of WWO and WCO can effectively disturb the nanoclusters caused by the increase of polar functional groups during the oxidation process. The effect of WWO is more significant, but neither of them can restore the asphaltene dispersion to the virgin asphalt binder. SLRO has an adverse effect on the disaggregation of oxidized asphaltene nanoclusters. WCO, WWO, and SLRO showed different disaggregation mechanisms, including ″pull-out, intercalation, and compression″, respectively. WCO and WWO can increase the activation energy reduced by aging in a short aging time, and SLRO makes the activation energy lower. Such findings can help enterprises screen more reasonable rejuvenators to facilitate the recycling of reclaimed asphalt pavement (RAP) materials and promote the sustainable development of the construction industry.
一种真正的再生剂必须具备分解氧化沥青质纳米团簇的能力。然而，很少有研究关注这个话题，并且缺乏对不同再生剂分解能力的比较。因此，本文研究了三种生物再生剂（废食用油（WCO）、废木油（WWO）和秸秆液化残渣油（SLRO））对氧化沥青质纳米团簇的分解能力和再生机理。采用实验室试验和分子动力学（MD）模拟来比较这三种生物再生剂的效果并揭示其相应机理。研究发现，这些生物再生剂对老化沥青结合料有软化作用，但并非所有再生剂都能分解氧化沥青质纳米团簇。WWO和WCO的引入能有效干扰氧化过程中因极性官能团增加而形成的纳米团簇。WWO的效果更显著，但它们都不能将沥青质分散恢复到原始沥青结合料的状态。SLRO对氧化沥青质纳米团簇的分解有不利影响。WCO、WWO和SLRO表现出不同的分解机理，分别为“拔出、插层和压缩”。WCO和WWO在短老化时间内可提高因老化而降低的活化能，而SLRO则使活化能降低。这些研究结果有助于企业筛选更合理的再生剂，以促进再生沥青路面（RAP）材料的回收利用，推动建筑业的可持续发展。
