01660217

Component

The present research work was undertaken to evaluate important functional characteristics such as dispersion, temperature susceptibility, aging resistivity potential, and high temperature storage stability of Carbon Nano Tube (CNT) modified asphalt binders. CNT content was varied as 0%, 0.4%, 0.75%, 1.5% and 2.25% by the weight of Control binder (AC-10). Viscosity was measured over a wide range of temperature to understand dispersion characteristics of CNT into asphalt binder matrix. Further, A-VTS parameters were estimated to evaluate temperature susceptibility of CNT modified asphalt binder. Analyses of viscosity data showed that CNT content up to 1.5% by the weight of Control binder may be recommended without potential problem of entanglement/clustering. Significant improvement in temperature susceptibility of Control binder was observed with addition of CNT. Similarly, complex modulus value over the range of temperature and frequency was evaluated to investigate the effect of CNT on aging resistivity potential of asphalt binder. The results showed that addition of CNT provides significant improvement in aging resistivity potential of asphalt binder. Likewise, high temperature storage stability was evaluated using softening point and Multiple Stress Creep Recovery (MSCR) tests. Similar conclusive remark from softening point as well as MSCR test for stability of CNT under high temperature storage condition was expected. Though softening point test methods showed sufficiently stable characteristics under high temperature storage for CNT modified binders, MSCR data indicated opposite trend for the same. Therefore, softening point approach may not be sufficient enough to capture high temperature storage stability problem especially for CNT modified asphalt binder.

This paper was sponsored by TRB committee AFK20 Standing Committee on Asphalt Binders.

18-03835

English

5p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

References

Aging (Materials); Bituminous binders; Dispersions (Chemistry); Softening point; Viscosity

Multiple Stress Creep Recovery

Carbon nanotubes; Complex modulus; Storage stability; Temperature susceptibility

Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2018 Paper #18-03835

TRIS, TRB, ATRI

Jan 8 2018 10:57AM