Rheology of modified binders under varying doses of WMA additive–Sasobit

ABSTRACT

Use of warm mix asphalt (WMA) technology to reduce construction temperatures of asphalt mix has gained strong interest worldwide. However, the technology is still in its inception stage in India. Present study evaluated the rheological properties of polymer- and crumb rubber-modified bitumen with various doses of WMA additive Sasobit (1%, 2%, and 3% by binder weight). Frequency sweep and temperature sweep results showed that increase in Sasobit content improved elastic properties of binders. Creep, repeated creep recovery, and multiple stress creep recovery results showed better resistance toward permanent deformation for Sasobit-modified binders in comparison to control binders.

KEYWORDS:

• additive dosage
• modified bitumen
• rheology
• Sasobit
• warm mix asphalt

Funding

The writers gratefully acknowledge Technology Systems Development Programme of Department of Science and Technology (DST), Govt. of India for their financial support.