Phase Behavior of Bitumen with Liquid Additives
In the past years, the use of liquid additives as bitumen modifiers has increased to enhance or adjust the properties of bitumen for a wide range of applications. Their molecular composition and mutual interaction result in specific phase morphologies in the binders. Hence, there is a need to evaluate the phase and interphase framework and physical properties of complex binders. The RILEM Technical Committee 272-PIM ‘Phase and Interphase behaviour of innovative bituminous Materials’, Task Group TG1 assesses the phase and interphase properties of complex bituminous binders. In this framework, three liquid additives have been selected: a commercial bio-based rejuvenator, a refined engine oil bottom and a paraffinic oil. These liquid additives were blended with base bitumen to achieve similar consistency and the blends were further aged. Physical properties were evaluated through rheology using dynamic shear rheometer (DSR) in a wide range of conditions. The phase morphology was addressed by using atomic force microscopy (AFM) and differential scanning calorimetry (DSC). The AFM and DSC results, from fresh and aged binders, reveal that each binder display specific phase morphology and glass transition haracteristics. Overall, in-depth understanding of phase and glass transition behavior of binders can assist the future design of durable bituminous material.
Architecture and Building
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Buildings and Infrastructures
Manuscript proces submitting Journal of Construction and Building Materials, 1-15