Some research has indicated a correlation between this adulteration of bitumen and poorer-performing pavement.
sˌʌm ɹᵻsˈɜːtʃ hɐz ˈɪndᵻkˌeɪɾᵻd ɐ kˌɔɹɪlˈeɪʃən bᵻtwˌiːn ðɪs ɐdˌʌltɚɹˈeɪʃən ʌv bɪtˈuːmɛn ænd pˈʊɹɹɚpɚfˈɔːɹmɪŋ pˈeɪvmənt.