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Many different chemical and polymer additives are used to improve the performance of asphalt. In general, polymer modifiers are the most common type of asphalt additive. Polymer asphalt modifiers fall into two categories: elastomers and plastomers. Elastomers commonly used to modify asphalt include styrene-butadiene and styrene-butadiene-styrene (SBS) block copolymers. Common plastomers used as asphalt additives are ethylene vinyl acetate (EVA) and low-density polyethylene.
Many kinds of chemical modifiers are used in asphalt as well. For example, polyphosphoric acid is traditionally used with polymer modifiers to increase viscosity and stiffness at high temperatures. Hydrocarbons can be added to provide softening or hardening effects. Also, antistripping additives are used to improve moisture resistance. Careful consideration should be given when selecting additives to optimize the performance of asphalt.
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