Asphalt Binder Modifiers Some asphalt cements require modification in order to meet specifications. Asphalt cement modification has been practiced for over 50 years but has received added attention in the past decade or so. The added attention can be attributed to the following factors (Roberts et al., 1996): Increased demand on HMA pavements . Traffic volume, loads and tire pressures have increased substantially in recent years, which can cause increased rutting and cracking. Many modifiers can improve the asphalt binder's stiffness at normal service temperatures to increase rut resistance, while decreasing its stiffness at low temperatures to improve its resistance tothermal cracking. Superpave asphalt binder specifications . Superpave asphalt binder specifications developed in the 1990s require asphalt binders to meet stiffness requirements at both high and low temperatures. In regions with extreme climatic conditi...
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