Study on rheological behavior of bitumen modified with a new thermoplastic elastomer preparing through dynamic vulcanization method

In this study, the rheological properties of paving binders modified with a proposed thermoplastic elastomer (TPE) alloy were investigated at high and intermediate temperatures which are essential temperatures to evaluate permanent deformations and cracks in hot mix asphalt. The proposed alloy was prepared through dynamic vulcanization method by mixing linear low density polyethylene (LLDPE), Styrene Butadiene Rubber (SBR), nanoclay, and petroleum bitumen which has a crucial role as compatibilizer. Bitumen in this alloy helps modified bitumen to be stable in high temperatures that shows prepared modifier is compatible with base bitumen. The modified binders were prepared by mixing a ۶۰/۷۰ penetration grade binder with ۲, ۴, and ۶% of the TPE. Perform ش nce based tests have been carried out on samples to evaluate fatigue and rutting resistance. The multiple stress creep and recovery (MSCR) test on modified binders showed improved resistance to permanent deformation (rutting) at ۶۴C (i.e., high in-service temperature of pavements). The Linear amplitude sweep test performed at ۲۵C showed improvement in resistance of binder to fatigue cracking.

کلیدواژه ها:

Bitumen ، Thermoplastic Elastomer ، Rheology ، Multiple Stress Creep and Recovery (MSCR) ، Linear Amplitude Sweep (LAS)