The traditional cold patch asphalt mixture (CPAM) has problems such as large amount of diluent,high porosity of the mixture and insufficient early strength.This study uses the biodiesel-diesel composite system as an environmentally friendly diluent.Through Brookfield rotational viscosity test,adhesion test and Fourier-transform infrared spectroscopy (FT-IR) analysis,the regulation law of biodiesel on the rheological properties and interfacial interaction of asphalt is revealed.The influence of biodiesel on the mechanical properties and durability of CPAM was quantified by the indirect tensile test and the rutting test.The test results show that biodiesel significantly reduces the 60℃ rotational viscosity of asphalt by 61% through the physical dispersion effect of ester groups (C=O),and increases the aggregate coating rate to 100%.When the content of biodiesel reaches 40%,the dynamic stability of CPAM reaches 9027 times/mm,which is 94.7% higher than that of the pure diesel system,the high-temperature anti-deformation ability is close to the level of hot-mixed asphalt.The three-dimensional cross-linked network formed by epoxy groups significantly enhances the asphalt-aggregate interface bonding.The residual stability increases to 88.9%,and the freeze-thaw splitting strength ratio reaches 94.3%.Biodiesel has the dual effects of a diluent and a modifier,it provides a green and efficient technical path for CPAM,promoting the sustainable development of road repair materials.
冷补沥青的粘度和工作性能取决于稀释剂的掺量,合理的选用稀释剂的粘度可以保证冷补沥青具备优异的施工和易性和长期存储性。选用4种不同质量比(柴油∶生物柴油=90∶10、80∶20、70∶30、60∶40)的柴油和生物柴油制备稀释沥青,根据ASTM D 4402[22]的要求,使用NDJ-1C Brookfield旋转粘度计对CPA在20、40、60、80℃下的粘度进行测试以初步评价其施工和易性,同时也测试了柴油(D)和生物柴油(Biodiesel)以及辅助添加剂(add)在不同温度下的布氏粘度,结果如表4所示。
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