In this application bitumen is used to bind aggregate particles like gravel and forms a substance referred to as asphalt concrete, which is  colloquially termed asphalt.
ɪn ðɪs ˌæplɪkˈeɪʃən bɪtˈuːmɛn ɪz jˈuːzd tə bˈaɪnd ˈæɡɹɪɡˌeɪt pˈɑːɹɾɪkəlz lˈaɪk ɡɹˈævəl ænd fˈɔːɹmz ɐ sˈʌbstəns ɹᵻfˈɜːd tʊ æz ˈæsfɔlt kˈɑːŋkɹiːt, wˌɪtʃ ɪz kəlˈoʊkwɪəli tˈɜːmd ˈæsfɔlt.