Kuang Dongliang, Ye Zhou, Yang Lifeng, Liu Ning, Lu Zaihong, Chen Huaxin
Engineering Research Central of Pavement Materials, Ministry of Education, Chang'an University, Xi'an 710064, China.
School of Civil Engineering, Qinghai University, Xining 810016, China.
Materials (Basel). 2018 Aug 20;11(8):1476. doi: 10.3390/ma11081476.
DBSA was used as a solubilizer together with conventional rejuvenator (CR) to produce a solubilized rejuvenator (SR), two kinds of aged bitumen involving TFOT aged bitumen and PAV aged bitumen were obtained by thin film oven test (TFOT) and pressurized aging vessel (PAV), respectively. Effects of CR and SR on the physical properties, chemical components, colloidal structure and micro-morphology of TFOT aged bitumen and PAV aged bitumen were investigated. Testing results of physical properties and chemical components indicated that CR and SR can replenish aged bitumen with necessary aromatics, TFOT aged bitumen that chemical component variation deteriorates its physical properties. With regard to PAV aged bitumen, of which the performance attenuation lies in chemical components variation and colloidal structure transformation, even if the content of CR reached up to 10 wt %, the regenerated bitumen cannot meet the regeneration requirement yet due to its definite influence on colloidal structure transformation, comparatively, sulfonic group in SR can react with the superficial atoms of asphaltenes to reform a solvation layer to facilitate the colloidal structure transformation of PAV aged bitumen, performance and beelike structure of regenerated PAV aged with bitumen with 10 wt % SR were approximated to that of virgin bitumen.
将二丁基琥珀酸酐（DBSA）与传统再生剂（CR）一起用作增溶剂以制备增溶再生剂（SR），分别通过薄膜烘箱试验（TFOT）和压力老化容器（PAV）获得了两种老化沥青，即TFOT老化沥青和PAV老化沥青。研究了CR和SR对TFOT老化沥青和PAV老化沥青的物理性能、化学成分、胶体结构和微观形态的影响。物理性能和化学成分的测试结果表明，CR和SR可以为老化沥青补充必要的芳烃，TFOT老化沥青的化学成分变化会使其物理性能变差。对于PAV老化沥青，其性能衰减在于化学成分变化和胶体结构转变，即使CR含量达到10 wt%，再生沥青由于其对胶体结构转变有一定影响，仍不能满足再生要求，相比之下，SR中的磺酸基团可与沥青质的表面原子反应形成溶剂化层，以促进PAV老化沥青的胶体结构转变，用10 wt% SR再生的PAV老化沥青的性能和蜂状结构与原始沥青相近。
