Abstract
A corn based bio-derived warm mix asphalt (WMA) additive is in the development stages and has shown to successfully reduce the mixing and compaction temperatures by 30 °C. The WMA additive, isosorbide distillation bottoms (IDB), is a co-product from the conversion of sorbitol to isosorbide where sorbitol is derived by hydrogenating glucose from corn biomass. A detailed investigation of binder properties at variable IDB dosages showed improvement in low temperature binder grades when tested in the BBR at a 0.5 % dosage rate by weight of binder. This research investigates low temperature improvement in two types of binders by comparing IDB-modified binder with binder modified using two commercially available/bio-derived WMA additives from the forest products industry. Multiple stress creep recovery and BBR binder tests indicated that the degree of improvement in binder properties may be binder dependent but improvement was observed for all WMA additives. Low temperature mix performance was evaluated in the semi-circular bending (SCB) test. SCB tests showed additive types were a statistically significant factor in the fracture toughness properties but not for stiffness and fracture energy. IDB was successfully used at reduced mixing and compaction temperatures and does not negatively impact low temperature fracture properties of warm mix asphalt. Improvement of binder properties was observed for all WMA additives studied.
Published Version
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