Effect of Nano Calcium Carbonate and Montmorillonite on Properties of Styrene - Butadiene - Styrene Copolymer Modified Asphalt

摘要

Composite modified asphalts with nano calcium carbonate (nano CaCO_3)/SBS and nano montmorillonite (nano MMT)/SBS were prepared respectively by melt blending. Rolling thin film oven test (RTFOT) was carried out to study the aging properties. The results demonstrate that CaCO_3/SBS and MMT/SBS homogeneously disperse in the base asphalt, which lead to an improvement in terms of toughness, strength, and thermal stability. Effects of the nano CaCO_3 and nano MMT on the properties of SBS modified asphalt appear as a decreasing penetration, an increasing softening point, and a decreasing ductility. The anti-aging property of the nano MMT/SBS modified asphalt was better than that of the CaCO_3/SBS modified asphalt and SBS modified asphalt.