Asfalt ni amazi meza ya virusiya hamwe nubwiza bwumukara kandi birashonze muri karubone depulfide (umuhondo-umuhondo, impumuro nziza). Bakunze kubaho muburyo bwa asfalt cyangwa tar.

Asfalt irashobora kugabanywa ahanini muburyo butatu: Amakara Tarhalt, asfalt ya peteroli na asfalt karemano: muri bo, amakara tar, ikibuga cyamakara ni igikoma. Petroleum asfalt ni ibisigisigi nyuma yo gutandukanya amavuta adasanzwe. Asfalt karemano yabitswe munsi yubutaka, kandi hari amabuye y'agaciro cyangwa akusanya hejuru yinkoni yisi.
Bitumen muburyo bwa asfalt buboneka mugutunganya amavuta yubukorikori binyuze mubikorwa. Bafite amanota ateka mumavuta yubukorikori kandi nibintu biremereye mumavuta yubukorikori, kugirango bazaboneka hepfo yiminara yishami.
Asfalt muburyo bwa tar iboneka mugufata ibintu kama (ahanini amakara) binyuze muri karubone.
Asfalt ikoreshwa kenshi mubwubatsi, nko guha agaciro umuhanda. Umuhanda wa kaburimbo hamwe na asfalt na kaburimbo bita imihanda ya asfalt.