Study of phase behavior of epoxy asphalt binders using differential scanning calorimetry

Glass transition parameters can be used to study the miscibility, or lack of it, in polymer-modified asphalt binders. In this study, contribution thermodynamics mixing glass was quantitatively assessed a differential scanning calorimeter for four binders partially and fully replaced by an epoxy system. The values heat capacity (Cp) and, subsequently temperature (Tg) all were determined quantify miscibility based on entropic changes. Emphasis also given examining enthalpy as function system composition during curing ensure that these completely crosslinked further analyses. cases, positive deviations measured Tg epoxy-modified (Tg,mix) obtained from ideal rule led negative entropy (ΔSmixc), dictating presence internal repulsive forces between components. Softer associated with low Tg,mix rule. Lastly, partial replacement increased decreased amount ΔSmixc, such performance imposes formation immiscible products.