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Evaluation of Isocyanate Asphalt Additive
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2022-04-01
[PDF-1008.29 KB]
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Edition:Technical Assistance Final Report, 3/2021–3/2022
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Abstract:Modifying asphalt binder is one of the primary methods of improving the performance of asphalt mixtures; the benefits include improved rutting resistance, cracking resistance, increased durability and stripping resistance. The addition of polymer, such as styrene-butadiene-styrene (SBS), is the most common method of modifying asphalt binders; however, chemical modifiers, extenders, hydrocarbons and anti-stripping additives are also employed to improve asphalt performance. A low viscosity isocyanate-based modifier for asphalt binders has been developed which claims to improve adhesion performance in the asphalt mix. The product crosslinks components in the liquid asphalt, and claims to reduce stripping of the aggregates from the binder and make a more flexible, sustainable pavement. This research intends to evaluate the effects of the additive on liquid asphalt and compacted asphalt pavements.
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