Zhao Quanman, Jing Shuo, Lu Xiaojin, Liu Yao, Wang Peng, Sun Min, Wang Li
School of Transportation Engineering, Shandong Jianzhu University, Jinan 250101, China.
Polymers (Basel). 2022 Jul 2;14(13):2718. doi: 10.3390/polym14132718.
In order to produce a high-viscosity asphalt and mixtures that can be used for ultra-thin overlays, high contents of Styrene-butadiene-styrene (SBS, 5%, 6%, 7%), styrene butadiene rubber (SBR, 1%, 2%, 3%) and micro carbon fiber (MCF, 0.8%) were used to modify conventional asphalt to prepare high-viscosity modified asphalt suitable for this purpose. The performance of the modified asphalts was evaluated by conventional index, kinematic viscosity, dynamic shear rheological test (DSR), multiple stress creep recovery test (MSCR), and bending beam rheometer test (BBR). The road performance of the modified asphalt mixtures was evaluated by high-temperature rutting, low-temperature bending, freeze-thaw splitting, fatigue, speckle, anti-skid, and water seepage tests. The results show that increasing the content of SBS can improve the high-temperature deformation resistance, low-temperature failure strain, kinematic viscosity, and viscosity toughness of modified asphalt, and the optimum content of SBS was 6%. SBR can improve the high-temperature performance, kinematic viscosity, and water damage resistance of modified asphalt, and the optimum dosage was 2%. Compared with 5% SBS-modified asphalt mixture, the dynamic stability, low-temperature failure strain, and freeze-thaw splitting strength ratio of 6% SBS + 0.8% MCF composite-modified asphalt mixture were increased by 48.7%, 24.7%, and 5.2% respectively. Compared with the 5% SBS-modified asphalt, the same characteristics of the 2% SBR + 5% SBS + 0.8% MCF composite-modified asphalt increased by 127.1%, 13.5%, and 5.5%, respectively. Compared with 5% SBS-modified asphalt, the fatigue performance of 6% SBS + 0.8% MCF-modified asphalt was improved by 32.2%. The kinematic viscosity of 6% SBS + 0.8% MCF and 5% SBS + 0.8% MCF + 2% SBR modified asphalt met the performance requirements of high-viscosity asphalt and had excellent road performance. It can be applied to ultra-thin overlays to optimize its adhesion with the original pavement.
为了生产可用于超薄罩面的高粘度沥青及混合料，采用高含量的苯乙烯 - 丁二烯 - 苯乙烯（SBS，5%、6%、7%）、丁苯橡胶（SBR，1%、2%、3%）和微碳纤维（MCF，0.8%）对常规沥青进行改性，以制备适用于此目的的高粘度改性沥青。通过常规指标、运动粘度、动态剪切流变试验（DSR）、多重应力蠕变恢复试验（MSCR）和弯曲梁流变仪试验（BBR）对改性沥青的性能进行评价。通过高温车辙、低温弯曲、冻融劈裂、疲劳、抗滑和渗水试验对改性沥青混合料的路用性能进行评价。结果表明，增加SBS含量可提高改性沥青的高温抗变形能力、低温破坏应变、运动粘度和粘度韧性，SBS的最佳含量为6%。SBR可提高改性沥青的高温性能、运动粘度和抗水损害能力，最佳用量为2%。与5% SBS改性沥青混合料相比，6% SBS + 0.8% MCF复合改性沥青混合料的动稳定度、低温破坏应变和冻融劈裂强度比分别提高了48.7%、24.7%和5.2%。与5% SBS改性沥青相比，2% SBR + 5% SBS + 0.8% MCF复合改性沥青的相同特性分别提高了127.1%、13.5%和5.5%。与5% SBS改性沥青相比，6% SBS + 0.8% MCF改性沥青的疲劳性能提高了32.2%。6% SBS + 0.8% MCF和5% SBS + 0.8% MCF + 2% SBR改性沥青的运动粘度满足高粘度沥青的性能要求，且具有优异的路用性能。它可应用于超薄罩面，以优化其与原路面的粘结性能。
