【摘要】 为进一步提升高黏沥青在寒区路面的低温性能及其混合料的路用性能，研究向基质沥青中分别掺入10%、12%、14%和16%的HVA高黏添加剂，制备高黏改性沥青。通过三大指标及布氏黏度试验评估其基本性能，并采用低温蠕变与应力松弛试验研究其低温流变特性。同时结合车辙、小梁弯曲及冻融劈裂试验，对多孔沥青混合料的路用性能进行系统评价。结果表明，HVA的加入可显著提升沥青高温抗剪切能力。随着HVA掺量的增加，沥青蠕变劲度增大，蠕变速率降低，低温抗裂性能得到强化。同时HVA能够降低沥青剪切应力，增强其低温应力松弛能力，但过高掺量会对沥青低温性能不利，HVA最佳掺量为14%。以HVA高黏改性沥青制备的OGFC-13混合料在高温稳定性与水稳定性方面表现优异，且其弯拉强度与弯曲破坏应变均高于SBS改性沥青混合料，显示出更佳的低温抗裂性能。更多还原

【Abstract】 To further enhance the low-temperature performance of high-viscosity asphalt in cold regions pavement and improve the pavement performance of its mixtures, this study introduced 10%, 12%, 14%, and 16% HVA high-viscosity additives into base asphalt to prepare high-viscosity modified asphalt. The fundamental properties were evaluated using three major performance indices and Brookfield viscosity tests, while low-temperature creep and stress relaxation tests were conducted to assess low-temperature rheological characteristics. Meanwhile, rutting, small-beam bending, and freeze-thaw splitting tests were performed to comprehensively evaluate the pavement performance of porous asphalt mixtures. The results indicate that incorporating HVA effectively improves the high-temperature shear resistance of asphalt. As HVA content increases, asphalt creep stiffness rises, creep rate decreases, and low-temperature cracking resistance is enhanced. HVA also reduces shear stress and improves the asphalt’s stress relaxation capacity under low temperatures. However, excessive HVA content adversely affects the asphalt’s low-temperature performance, with 14% identified as the optimal dosage. The OGFC-13 mixture produced using HVA-modified asphalt exhibits excellent high-temperature stability and water stability, and its flexural tensile strength and bending failure strain both surpass those of SBS-modified asphalt mixtures, demonstrating superior low-temperature cracking resistance.更多还原