Chemical characteristics analyze of SBS-modified bitumen containing composite nanomaterials after aging by FTIR and GPC

To improve the thermal-oxidation aging resistance and anti-ultraviolet (UV) aging of SBS-modified bitumen. Nanometer-titania (nano-TiO2) was compounded with organically expanded vermiculite (OEVMT) and organic montmorillonite (OMMT) to prepare composite nanomaterials (OEVMT/TiO2 and OMMT/TiO2). The results showed that OEVMT/TiO2 and OMMT/TiO2 improved the anti-deformation ability of SBS-modified bitumen. Under the same aging conditions, the carbonyl index (CI) and butadiene index (BI) of the composite nanomaterials modified bitumen had smaller changes than the original bitumen. At the same time, it was found that OEVMT/TiO2 and OMMT/TiO2 significantly reduced the LMS growth rate of original bitumen, which effectively inhibited the transfer rate of small and medium molecular size to LMS during the aging process.

Automated summary

In this study, composite nanomaterials were prepared by compounding nanometer-titania with organically expanded vermiculite and organic montmorillonite to improve the aging resistance of SBS-modified bitumen. The results showed that these materials enhanced the anti-deformation ability of the bitumen, reduced the changes in chemical indices during aging, and effectively inhibited the growth rate of low molecular weight species.