Concha Jose L, Delgadillo Rodrigo, Arteaga-Pérez Luis E, Segura Cristina, Norambuena-Contreras Jose
LabMAT, Department of Civil and Environmental Engineering, University of Bío-Bío, Concepción 4051381, Chile.
Departamento de Obras Civiles, Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile.
Polymers (Basel). 2023 Mar 22;15(6):1578. doi: 10.3390/polym15061578.
This study aimed to determine an optimal dosage of sunflower oil (i.e., Virgin Cooking Oil, VCO) as a rejuvenator for asphalt self-healing purposes, evaluating its effect on the chemical (carbonyl, and sulfoxide functional groups), physical (penetration, softening point, and viscosity), and rheological (dynamic shear modulus, and phase angle) properties of long-term aged (LTA) bitumen. Five concentrations of sunflower oil (VCO) were used: 1%, 2%, 3%, 4%, and 5% vol. of LTA bitumen. VCO was encapsulated in alginate biopolymer under vibrating jet technology using three biopolymer:oil (B:O) mass ratios: 1:1, 1:5, and 1:9. The physical, thermal, and mechanical properties of the capsules were studied, as well as their effect on the physical properties of dense asphalt mixtures. The main results showed that an optimal VCO content of 4% vol. restored the chemical, physical, and rheological properties of LTA bitumen to a short-term ageing (STA) level. VCO capsules with B:O ratios of 1:5 presented good thermal and mechanical stability, with high encapsulation efficiency. Depending on the B:O ratio, the VCO capsule dosage to rejuvenate LTA bitumen and asphalt mixtures varied between 5.03-15.3% wt. and 0.24-0.74% wt., respectively. Finally, the capsule morphology significantly influenced the bulk density of the asphalt mixtures.
本研究旨在确定作为沥青自愈促进剂的向日葵油（即初榨食用油，VCO）的最佳剂量，评估其对长期老化（LTA）沥青的化学性质（羰基和亚砜官能团）、物理性质（针入度、软化点和粘度）以及流变性质（动态剪切模量和相位角）的影响。使用了五种浓度的向日葵油（VCO）：占LTA沥青体积的1%、2%、3%、4%和5%。采用振动喷射技术，使用三种生物聚合物与油（B:O）的质量比（1:1、1:5和1:9）将VCO包裹在藻酸盐生物聚合物中。研究了胶囊的物理、热学和力学性能，以及它们对密实沥青混合料物理性能的影响。主要结果表明，4%体积的最佳VCO含量可将LTA沥青的化学、物理和流变性能恢复到短期老化（STA）水平。B:O比为1:5的VCO胶囊具有良好的热稳定性和力学稳定性，封装效率高。根据B:O比，使LTA沥青和沥青混合料恢复活力所需的VCO胶囊剂量分别在5.03 - 15.3%重量和0.24 - 0.74%重量之间变化。最后，胶囊形态对沥青混合料的堆积密度有显著影响。
