掺入聚氨酯脲的沥青混合料性能研究

Study on Performance of Asphalt Mixtures Mixed with Polyurethane Urea

摘要:

研究探讨聚氨酯脲（PUU）作为新型改性材料在沥青路面工程中的应用效果，重点分析了其在SMA-13沥青混合料中替代传统填料的可行性。通过设计不同配比的聚氨酯脲、矿粉、木质素纤维复合改性方案，采用马歇尔试验、车辙试验、低温弯曲试验等测试方法，全面评估了混合料的高低温性能及水稳定性等关键指标。结果表明：当采用聚氨酯脲替代矿粉时，混合料的高低温性能及水稳定性满足规范要求；但聚氨酯脲的掺量对混合料性能具有显著影响，过量添加会导致沥青混合料性能衰减。建议在实际工程中控制聚氨酯脲掺量。验证了聚氨酯脲作为填料在沥青混合料中的适用性，为绿色环保型沥青路面的材料设计与施工提供了支撑。

Abstract:

The application effects of polyurethane urea (PUU) as a new modified material in asphalt pavement engineering are studied and discussed. Its feasibility of its substitution for traditional fillers in SMA-13 asphalt mixture is analyzed emphatically. By designing the composite modification schemes with varying proportions of PUU, mineral powder, and lignin fiber, and using the test methods such as Marshall test, wheel tracking test and low-temperature bending test, the key indicators of the high-temperature and low-temperature properties and water stability of the mixture are completely evaluated. The results demonstrate that when PUU replaces the mineral powder, the high-temperature and low-temperature performances and water stability of the mixture meet the standard requirements. However, the PUU content significantly influences the mixture properties. The excessive addition can lead to the degradation of asphalt mixture performance. Therefore, it is recommended to control the PUU content in the practical engineering applications. The suitability of PUU as a filler in asphalt mixtures is verified, which provides the support for the material design and construction of green and environmentally friendly asphalt pavements.