Malinga ndi kafukufuku wam'mbuyomu ndi kafukufuku wam'munda, phula la asphalt limakhudzidwa ndi kusinthasintha, kuyamwa, okosijeni, ndi ma photochemical reaction of the path, ndipo chiŵerengero cha asphalt chimatsika kwambiri pansi pa ukalamba woyambirira, zomwe zimapangitsa kuti pakhale phokoso losalimba komanso losalimba. Ndi kukokoloka kwina kwa phula, msewu wazaka zapakati ukuwonetsa zomwe zili. Miyala ya asphalt imalowa mu ukalamba chifukwa cha kung'ambika kosalekeza ndi nyengo, momwe miyalayi imawonekera ku tinthu ting'onoting'ono pamtunda.

Panthawi ya ukalamba, kupunduka ndi mphamvu zamapangidwe a njirayo zimachepa. Pamapeto pake, kupsinjika kwakukulu kwa msewu kumachitika monga ming'alu yozungulira, ming'alu ya ng'ombe, maenje ndi rutting. Njirayi imachepetsa kwambiri kukhuthala ndi kuphulika, imawonjezera ductility ndi kusinthasintha, ndipo imapangitsa kuti asphalt isayambe kusweka ndi kuwonongeka.
Mosiyana ndi zokutira zachikale zachisindikizo, kugwiritsa ntchito kamodzi kokha kwa gawo loyesa kukonzanso phula kumalowa m'njira kuti kubwezeretsedwe ndikusintha phula ndi phula lomwe latayika chifukwa cha oxidation pamtunda wocheperako kuposa phula lotetezedwa. Imasindikizanso ndikuteteza njira yodutsamo kumadzi, kuwala kwa dzuwa ndi zowononga mankhwala, kumapangitsa kukhazikika, moyo komanso kuchepetsa kukongola kwa phula. Opanga kusakaniza phula amakukumbutsani kuti kukonza moyenera ndikofunika kwambiri kuti muteteze phula kuchokera kuzinthu zakunja zomwe zimavala ndi kung'ambika.