滨海地区桥面铺装速溶高黏沥青混合料性能研究

Study on Performance of Instant High-Viscosity Asphalt Mixture for Bridge Deck Pavement in Coastal Area

摘要:

为研究速溶高黏改性沥青混合料在滨海地区桥面铺装中的路用性能，通过制备速溶高黏改性沥青和SMA（asphalt mastic stone）沥青混合料，对比SBS（styrenic block copolymers）改性沥青，进行路用性能和耐久性检验。结果表明：速溶高黏改性沥青混合料的高温动稳定度更大，抗蠕变能力更强；低温弯曲破坏应变更高，弯曲劲度模量更低，断裂能和抗裂指数更大；在纯水冻融劈裂、盐水浸泡和盐水冻融循环条件下，劈裂强度损失更小。综上所述，速溶高黏改性沥青及其SMA-13混合料在高温稳定性、低温抗裂性、水稳定性和抗盐蚀性方面具有显著优势，为滨海地区桥面铺装材料的选择提供了科学依据。

Abstract:

To study the pavement performance of instant high-viscosity modified asphalt mixtures for bridge deck pavements in coastal areas, by preparing the instant high-viscosity modified asphalt mixtures and asphalt mastic stone (SMA) and comparing the styrenic block copolymers (SBS) modified asphalt, the pavement performances and durability are verified. The results demonstrate that the high-temperature dynamic stability of the instant high-viscosity modified asphalt mixture is greater, its resistance to creep deformation is stronger, its low-temperature bending failure strain is higher, its bending stiffness modulus is lower, and its fracture energy and crack resistance indexes are larger. Under the conditions of pure water freeze-thaw splitting, saltwater immersion and saltwater freeze-thaw cycle, the splitting strength loss is smaller. In conclusion, the instant high-viscosity modified asphalt and its SMA-13 mixture have the obvious advantages in terms of high-temperature stability, low-temperature crack resistance, moisture stability and salt erosion resistance, providing a scientific basis for the selection of bridge deck pavement materials in coastal areas.