An asphalt binder based on polymer modified bitumen, hot mix asphalts made thereof, and pavements made therefrom

摘要

An asphalt binder comprising 85 to 98.5 parts by weight of a bitumen and 15-1.5 parts by weight of a polymer composition, wherein the polymer composition comprises: (i) from 5 to 70% by weight of a linear styrenic block copolymer (SBC1) comprising at least two polymer blocks each substantially made of an aromatic vinyl compound and at least one polymer block substantially made of a conjugated diene compound and having an apparent molecular weight greater than 250,000 and/or a radial styrenic block copolymer (SBC2) having three or more polymer arms attached to the residue of a cross-linking agent or multifunctional compound, comprising at least two polymer blocks each substantially made of an aromatic vinyl compound and at least one polymer block substantially made of a conjugated diene compound and wherein the polymer arms have an average apparent molecular weight greater than 125,000 and (ii) from 95 to 30% by weight of an elastomer (EI) having an apparent molecular weight in the range of 120,000 to 250,000, preferably a styrenic diblock copolymer having one polymer block substantially made of an aromatic vinyl compound and at least one polymer block substantially made of a conjugated diene compound.