Preparation Method and Performance Evaluation of a Sealant for Asphalt Pavement Cracks

由于行车荷载、自然环境等因素的影响，沥青路面在服役过程中易出现早期裂缝，严重时会导致沥青路面结构的破坏，影响沥青路面的使用寿命。采用糠醛抽出油(FEO)、胶粉(CR)和有机蒙脱土(OMMT)对中试I-B型SBS改性沥青进行复合改性制备沥青路面灌缝胶，采用三因素三水平正交试验，以灌缝胶的软化点、锥入度、5℃延度、密度、黏度、弹性恢复为技术指标，通过极差法分析糠醛抽出油(FEO)、胶粉(CR)和有机蒙脱土(OMMT)掺量对灌缝胶性能的影响，进而确定该灌缝胶的最佳配合比；最后通过压力老化试验评价其抗老化性能。结果表明：选择3%糠醛抽出油(FEO)、18%胶粉(CR)、2%有机蒙脱土(OMMT)时，灌缝胶的综合性能最佳。Due to the impact of factors such as traffic loads and natural environments, asphalt pavements are susceptible to early cracking during their service life, which, in severe cases, can result in structural damage and compromise the service life of the asphalt pavement. Composite modification of pilot I-B type SBS modified asphalt was conducted using furfural extract oil (FEO), rubber powder (CR), and organic montmorillonite (OMMT) to prepare asphalt pavement crack sealing material. A three-factor, three-level orthogonal experiment was implemented, utilizing the softening point, cone penetration, ductility at 5˚C, density, viscosity, and elastic recovery of the sealing material as technical indicators. The influence of the incorporation levels of FEO, CR, and OMMT on the performance of the sealing material was analyzed through the range method, thereby determining the optimal mix ratio for the sealing material. Lastly, its resistance to aging was evaluated through pressure aging tests. The results indicated that the comprehensive performance of the sealing material was optimal when using 3% FEO, 18% CR, and 2% OMMT.