fig4
Figure 4. The box plot of SARA-derived indices for five asphalt binders: (A) CII; (B) AI. *Significance level P-value ≤ 0.05; ***significance level P-value ≤ 0.001; ****significance level P-value ≤ 0.0001. SARA: Saturate, aromatic, resin, and asphaltene; CII: colloidal instability index; AI: asphaltenes index.