基于拉拔实验的多种改性剂对沥青黏附与自愈合性能的影响

Effects of Multiple Modifiers on Adhesive and Self-Healing Properties of Asphalt Based on Bitumen Bond Strength Test

摘要:

利用沥青拉拔实验评价了5种工程中常用的改性剂对沥青黏附与自愈合性能的作用，并探究了不同掺量的影响。此外，对不同种类的沥青对应的混合料试件进行了引入间歇愈合时间的四点小梁疲劳实验，并将沥青的拉拔自愈合与沥青混合料疲劳自愈合结果进行相关性分析。结果表明，线型苯乙烯?丁二烯?苯乙烯嵌段共聚物（SBS）、高密度聚乙烯、胶粉对沥青的黏附性能均有不利影响，而岩沥青能够显著提升沥青的黏附强度。高密度聚乙烯、橡胶颗粒及较低掺量（质量分数≤12.0%）的岩沥青能够改善沥青的自愈合能力。此外，四点小梁疲劳?愈合实验表明，沥青黏附与自愈合性能与对应混合料的疲劳自愈合性能之间存在强相关性，验证了拉拔实验在评价沥青材料愈合性能方面的准确性。

Abstract:

Adhesive and self-healing properties are two inherent properties that should be considered when evaluating the durability of asphalt materials. In this paper， the binder bond strength （BBS） test is applied to evaluate the effects of five representative modifiers at varying dosages on the adhesive and self-healing properties of asphalt. Moreover， the four-point beam （4PB） fatigue test with a healing interval period is conducted and correlated with BBS testing results. It is found that linear SBS， high-density polyethylene （HDPE） and rubber all have negative effects on the asphalt adhesive strength while only gilsonite can enhance the adhesive property. HDPE， rubber and gilsonite at lower dosages （≤12.0%） can improve the asphalt self-healing property. In addition， the strong correlation of the healing performance between binder and mixture is found， verifying the accuracy of the BBS test in evaluating the healing performance of asphalt materials.