Effects of Liquid Anti-Stripping Additives on Rheological Properties of Performance Grade Binders

This study presents a testing protocol for evaluating the viscoelastic properties of selected performance grade (PG) binders using a dynamic mechanical analyzer (DMA). It also presents the effects of amine-based liquid anti-stripping additives on the binders ' rheological properties. Out of total 183 samples tested, 51 samples for three PG binders (PG 64-22, PG 70-28, and PG 76-28) were tested to establish the DMA-based testing protocol. The remaining samples were tested to obtain rheological data of the PO 64-22 binder with different dosages of two anti-stripping (AS) additives. Test results of the DMA were validated by comparing with those obtained from a dynamic shear rheometer (DSR). Test results show that the DMA can be used as an alternative tool for examining the viscoelastic behavior of binders. It was observed that the rutting factor [G*/Sin(δ)] of the binder decreased when the amount of AS additive was increased. The optimum dosage of either of these AS additives was found to be 0.50%. AS additives did not alter the mechanical workability and the linear viscoelastic limit of the binder. Also, a good correlation between the complex modulus of the PG 64-22 binder and the dynamic modulus of the corresponding mix was observed.

並列關鍵字

Anti-stripping additive ； Complex modulus ； DMA ； Sweep test ； Viscoelastic

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