Impacts of colloidal and interfacial interactions on bonding strength of rubberized RAP asphalt binder

Aging Potential and its Impact on the Bonding Strength of Rubberized RAP Asphalt Binder

“…Previous studies revealed the role of CR in improving the BBS, where the withdrawal of light components due to CR interaction elevates the percentage of asphaltene in the liquid phase and spurs the formation of the clusters. Moreover, the gel phase acts as a filler inside the binder colloid, further improving the BBS. , …”

“…However, the BBS represents the binder cohesion strength if the failure occurred within the binder thickness and the binder still covers the tested area on the aggregate slab. The aggregate mineral composition significantly affects the adhesion strength and the binder cohesion strength of thin thickness, whereas it does not affect the binder cohesion strength of thick thickness …”

“…Moreover, the gel phase acts as a filler inside the binder colloid, further improving the BBS. 29,30 Binder Bond Strength of Aged Binders. The correlation analysis reveals that BBS after aging is also highly ascribed to the %RAP binder and %CR, as shown in Figure 10a.…”

“…The aggregate mineral composition significantly affects the adhesion strength and the binder cohesion strength of thin thickness, whereas it does not affect the binder cohesion strength of thick thickness. 29 FTIR Test. The binder chemical composition was determined by the FTIR test, where a binder sample of 0.5 g weight was exposed to infrared radiation with wavelengths varying from 600 to 4000 cm −1 .…”

“…The BBS of CRMBs and CRRAPBs is highly attributed to the interaction between CR and the binder. Furthermore, they ascertained that the accretion of the carbonyl functional group and the reduction of aliphatic groups in the binder colloid strengthen the BBS. − …”