Zhu Siyue, Qin Xiantao, Liao Menghui, Ma Yuxi, Xu Hao, Chen Jingyi, Gao Haobo
School of Civil Engineering and Architecture, Wuhan Polytechnic University, 68 Xuefu South Road, Wuhan 430023, China.
School of Transportation and Logistics Engineering, Wuhan University of Technology, 1178 Heping Avenue, Wuhan 430063, China.
Materials (Basel). 2023 Sep 17;16(18):6250. doi: 10.3390/ma16186250.
With the acceleration of the construction of sponge cities in China, porous asphalt pavement (PA) is has been widely used. High-viscosity asphalt (HVA) is the core material in building PA because it has good rheology properties, which can provide good raveling and rutting resistance. However, due to the open-graded structure of PA, HVA was more susceptible to rapid aging, which significantly affects the durability of PA. To investigate the thermal aging effect on the rheological properties of self-modified HVA (SHVA), five types of asphalts were aged using a rolling thin film oven (RTFO) and pressure aging vessel (PAV). Then, rheological tests were adopted, such as temperature sweep test (TS), repeated creep and recovery test (RCR), and bending beam rheometer test (BBR). The results indicate that during the aging process, the oxidation-induced hardening effect of neat asphalt and the degradation-induced softening effect of the modifier changes the rheology properties of HVA significantly. As the aging progresses, the contribution of the modifiers of HVA to anti-aging performance is greatly reduced. At high temperatures, HVA demonstrates better anti-aging performance than conventional styrene-butadiene-styrene (SBS)-modified asphalt (Guo Chuang, GC). The change of the high-temperature rheological indices of the two HVA types (SHVA and TAFPACK-super HVA (TPS)) showed a smaller activation energy index (EAI), a more considerable viscous component of binder creep stiffness (Gv), and more minor accumulated stain (), indicating a more significant anti-short-term and long-term aging performance, which is beneficial to the high-temperature performance of asphalts. However, the changes in low-temperature rheological properties do not align with those in high-temperature rheological properties after long-term aging. The BBR test results reveal that TPS exhibits worse low-temperature performance than GC and SHVA. During the thermal aging process, the contribution rate of the modifiers in SHVA against RTFO and PAV aging is higher than that of the modifiers in TPS, which contributes to the superior anti-aging property. Overall, SHVA demonstrates the best anti-aging performance among the five asphalts tested.
随着中国海绵城市建设的加速，多孔沥青路面（PA）得到了广泛应用。高粘度沥青（HVA）是建造PA的核心材料，因为它具有良好的流变性能，能提供良好的抗松散和抗车辙性能。然而，由于PA的开级配结构，HVA更容易快速老化，这显著影响了PA的耐久性。为了研究热老化对自改性HVA（SHVA）流变性能的影响，使用旋转薄膜烘箱（RTFO）和压力老化容器（PAV）对五种类型的沥青进行了老化处理。然后，采用了流变试验，如温度扫描试验（TS）、重复蠕变恢复试验（RCR）和弯曲梁流变仪试验（BBR）。结果表明，在老化过程中，纯沥青的氧化硬化效应和改性剂的降解软化效应显著改变了HVA的流变性能。随着老化的进行，HVA中改性剂对抗老化性能的贡献大大降低。在高温下，HVA表现出比传统苯乙烯-丁二烯-苯乙烯（SBS）改性沥青（国产，GC）更好的抗老化性能。两种HVA类型（SHVA和TAFPACK-超级HVA（TPS））的高温流变指标变化显示出较小的活化能指数（EAI）、粘结剂蠕变刚度（Gv）中更可观的粘性成分以及更小的累积应变（），表明具有更显著的抗短期和长期老化性能，这有利于沥青的高温性能。然而，长期老化后低温流变性能的变化与高温流变性能的变化不一致。BBR试验结果表明，TPS的低温性能比GC和SHVA差。在热老化过程中，SHVA中改性剂对RTFO和PAV老化的贡献率高于TPS中改性剂的贡献率，这有助于其卓越的抗老化性能。总体而言，SHVA在测试的五种沥青中表现出最佳的抗老化性能。
