添加Sasobit温拌沥青混合料的拌和与压实温度确定

通过实验室沥青粘度试验与混合料击实试验，探讨路用添加Sasobit温拌沥青混合料拌和与压实温度的合理确定方法.试验结果与结果分析显示，传统沥青等粘度原则方法远远低估了Sasobit的降温效果，不适用于添加Sasobit的沥青混合料.提出了混合料等体积原则确定沥青混合料压实温度中值的方法，同时适用于净沥青混合料与Sasobit沥青混合料.对于净沥青混合料，混合料等体积原则方法与沥青等粘度原则方法确定的压实温度实际相同；对于Sasobit沥青混合料，混合料等体积原则方法确定的压实温度与厂商的建议及迄今的实践一致.鉴于导致Sasobit沥青表观粘度与实际流动性差异的因素对相对值的影响有限，建议了合理假定，分别确定Sasobit混合料压实温度的上下限以及混合料拌和温度上下限.

Determination of the Mixing and Compaction Temperatures for Warm Mix Asphalt with Sasobit

Asphalt binder viscosity tests and mixture compaction tests were conducted to explore a reasonable method for the determination of the mixing and compaction temperatures for warm mix asphalt (WMA) with Sasobit additive for paving roads. Test results and result analyses have indicated that the traditional binder equiviscous principle is not applicable to Sasobit mixture due to the significant underestimation of the temperature-decreasing effect of the additive. A mixture equivolumetric principle was proposed, which is applicable to both neat binder and Sasobit mixtures to determine the compaction temperature. For neat binder mixture, the temperature determined by using mixture equivolumetric principle is essentially the same as that determined by using binder equiviscous principle. For Sasobit mixture, the temperature determined by using mixture equivolumetric principle is consistent with those recommended by the manufactures and those in practice to date. In view of the fact that influencing factors have little effect on the differences between the apparent viscosity and the actual flow ability, assumptions were also proposed to determine the upper and lower limits of mixing and compaction temperatures.