Abstract
This study was intended to evaluate the susceptibility of asphalt binders and mixtures to rutting. The binders have the same high PG grade (PG 76-xx) and a dense-graded gradation curve was used to produce the mixtures. Three types of polymers – Elvaloy®, SBS and SBR – and polyphosphoric acid (PPA) were selected. The tests included softening point, oscillatory shear (parameter G∗/sinδ), multiple stress creep and recovery (Jnr) and flow number (FN). The rankings of binder and mixture parameters (Jnr, G∗/sinδ, softening point and FN) are the same only for Jnr and FN, and the applicability of G∗/sinδ to modified materials is questionable.
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