AUTHOR=Zhang Dabin , Zhang Zhanli , Huang Tuo , Huang Zibei , Zhou Zihang , Huang Jianhong 

TITLE=Study on fatigue characteristics of anti-stripping sandstone asphalt mixture after water immersion

JOURNAL=Frontiers in Materials

VOLUME=Volume 12 - 2025

YEAR=2025

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2025.1634717

DOI=10.3389/fmats.2025.1634717

ISSN=2296-8016

ABSTRACT=The insufficient adhesion between sandstone aggregates and asphalt binders makes the mixture susceptible to fatigue cracking under moisture conditions, limiting the widespread application of sandstone aggregates. Thus, two non-amine anti-stripping agents, XT-1 (XT) and PM-JL-06A (PM), were selected to enhance the adhesion properties of sandstone asphalt mixtures. First, the type and optimal dosage of anti-stripping agents were determined through three indicators and the boiled method test. Then, four point bending strength tests with different loading rates were carried out on the immersion and non-immersion sandstone asphalt mixture, and on this basis, four point bending fatigue test and fatigue residual strength test were carried out. The results show that compared to the XT anti-stripping agent, the PM agent more effectively enhances the adhesion of sandstone–asphalt mixtures, raising the adhesion grade from level 3 to above level 4 at an optimal dosage of 0.4%. Compared with conventional SBS-modified sandstone asphalt mixtures, PM-modified mixtures showed a 5.3% average increase in dynamic load strength under dry conditions and an 8.4% improvement under water immersion conditions. Furthermore, the addition of PM anti-stripping agent increased the fatigue life by 33.8% under dry conditions and 38.9% under water immersion conditions. Notably, PM modification significantly reduced the damage factor and damage sensitivity of the mixture under cyclic loading while substantially decreasing the fatigue strength decay rate.