Due to its highly viscous nature, bitumen must be heated so it can be mixed with the aggregates at the asphalt mixing facility.
dˈuː tʊ ɪts hˈaɪli vˈɪskəs nˈeɪtʃɚ, bɪtˈuːmɛn mˈʌst biː hˈiːɾᵻd sˌoʊ ɪt kæn biː mˈɪkst wɪððɪ ˈæɡɹɪɡˌeɪts æt ðɪ ˈæsfɔlt mˈɪksɪŋ fəsˈɪlᵻɾi.