Shi Xiaote, Si Chundi, Yan Kewei, Zhu Yuefeng
School of Traffic and Transportation, Shijiazhuang Tiedao University, Shijiazhuang, 050043, Hebei, China.
Department of Rail Transit, Shijiazhuang Institute of Railway Technology, Shijiazhuang, 050043, Hebei, China.
Sci Rep. 2024 Dec 20;14(1):30580. doi: 10.1038/s41598-024-82475-8.
Accurately assessing the low-temperature performance of asphalt materials is important for asphalt pavements in cold regions with large temperature differences. This study investigates the effects of freeze-thaw cycles on the low-temperature performance of basalt fiber-rubber powder composite modified asphalt mixtures (BRMAM). The influence of basalt fibers content on the mechanical properties of asphalt binder was characterized through basic property tests and bending beam rheometer (BBR) assessments. A freeze-thaw cycle process was designed to stimulate the more realistic climate. The deterioration of low-temperature performance and freeze-thaw damage mechanism were analyzed by the splitting tensile test, three-point bending test and semi-circular bending (SCB) test. Methods suitable for evaluating BRMAM's low-temperature performance were compared and explored. The results indicate that when fiber content was about 0.3%, the reinforcement effect of basalt fibers on asphalt material was more pronounced. As freeze-thaw cycles progress, the impact of frost heave force on the cracking resistance significantly increases, while the influence degree gradually decreases. Excess fibers reduced the interfacial bond between rubber powder modified asphalt and aggregate. When fiber content is between 0.2 and 0.4%, BRMAM demonstrates optimal low-temperature performance and the least sensitivity to freeze-thaw cycles. After 30 cycles, the TSR of BRMAM with 0.3% basalt fiber even reached 47.6%.
准确评估沥青材料的低温性能对于温度差异较大的寒冷地区的沥青路面至关重要。本研究调查了冻融循环对玄武岩纤维-橡胶粉复合改性沥青混合料（BRMAM）低温性能的影响。通过基本性能试验和弯曲梁流变仪（BBR）评估来表征玄武岩纤维含量对沥青结合料力学性能的影响。设计了冻融循环过程以模拟更实际的气候条件。通过劈裂拉伸试验、三点弯曲试验和半圆弯曲（SCB）试验分析了低温性能的劣化和冻融破坏机理。比较并探索了适用于评估BRMAM低温性能的方法。结果表明，当纤维含量约为0.3%时，玄武岩纤维对沥青材料的增强效果更为显著。随着冻融循环次数的增加，冻胀力对抗裂性的影响显著增大，而影响程度逐渐减小。过多的纤维会降低橡胶粉改性沥青与集料之间的界面粘结。当纤维含量在0.2%至0.4%之间时，BRMAM表现出最佳的低温性能，并且对冻融循环的敏感性最低。经过30次循环后，含0.3%玄武岩纤维的BRMAM的TSR甚至达到了47.6%。
