Investigating the influence of using nano-composites on storage stability of modified bitumen and moisture damage of HMA

ABSTRACT

In this study, a composite of styrene butadiene rubber (SBR) and nano-clay was made with different ratios and used for bitumen modification. The results show that using nano-composites improves storage stability at high temperature. However, pure SBR modified bitumen is proved not to be stable at high temperature. Investigating the results of indirect tensile strength and indirect tensile strength ratio also indicates that nano-composites improve moisture sensitivity of hot mix asphalt (HMA). Further, according to the results, increasing the content of nano-clay enhances the resistant of asphalt mixtures against moisture damage.

KEYWORDS:

• Indirect tensile strength
• modified bitumen
• moisture damage
• nano-composite
• SBR
• storage stability