It is mixed with traditional bitumen to improve both the viscoelastic properties and the resistance to ageing.
ɪɾ ɪz mˈɪkst wɪð tɹɐdˈɪʃənəl bɪtˈuːmɛn tʊ ɪmpɹˈuːv bˈoʊθ ðə vˌɪskoʊlˈæstɪk pɹˈɑːpɚɾiz ænd ðə ɹᵻsˈɪstəns tʊ ˈeɪdʒɪŋ.