基于响应面法的RAP再生冷补剂组分优化与性能研究

Optimization of Components and Performance of RAP Recycled Cold Patch Agent Based on Response Surface Methodology

摘要: 为提升废旧沥青混合料利用率，开发专用再生冷补剂。以老化沥青为基体，选取废机油、SBR胶乳及石油树脂为关键组分，采用响应面法(Box-Behnken设计)分析三者掺量对冷补液60℃标准粘度的影响；并试验研究SBR与石油树脂对再生沥青软化点与15℃延度的改善效果。结果表明：废机油掺量是影响冷补液粘度的唯一显著因素(P < 0.0001)，呈负向线性关系，是控制施工和易性的关键参数；SBR与石油树脂能有效提升再生沥青的软化点和延度，但石油树脂掺量超过1.5%会导致延度下降。基于“工作性优先，性能优化”原则，优化配合比(占老化沥青质量百分比)为：老化沥青:SBR胶乳:石油树脂:废机油 = 100:5:1.5:10。该研究为RAP在冷补养护中的高效、高值化利用提供了有价值的技术方案和理论依据。

Abstract: To improve the utilization rate of Reclaimed Asphalt Pavement (RAP), a specialized recycled cold patch agent was developed. Using aged asphalt as the matrix, waste engine oil, SBR latex, and petroleum resin were selected as key components. The response surface methodology (Box-Behnken design) was employed to analyze the effects of their dosages on the 60˚C standard viscosity of the cold patch liquid, and experiments were conducted to investigate the improvements of SBR and petroleum resin on the softening point and 15˚C ductility of regenerated asphalt. Results indicate that waste engine oil dosage is the only significant factor affecting viscosity (P < 0.0001), with a negative linear relationship, serving as the key parameter controlling construction workability. The addition of SBR and petroleum resin effectively enhances both softening point and ductility of regenerated asphalt, but petroleum resin dosage exceeding 1.5% leads to a noticeable decrease in ductility. Based on the principle of “workability priority, performance optimization”, the optimized mix proportion (percentage by mass of aged asphalt) is determined as: aged asphalt:SBR latex:petroleum resin:waste engine oil = 100:5:1.5:10. This study provides valuable technical solutions and a theoretical basis for the efficient and high-value utilization of RAP in cold-patching maintenance.