Bitumen yog cov kua dub thiab muaj kuab heev lossis ib nrab khoom ntawm cov roj av. Tej zaum nws yuav pom nyob hauv cov ntxhia pob zeb. Lub ntsiab siv asphalt (70%) yog nyob rau hauv kev kev tsim kev, raws li phau ntawv los yog nplaum rau asphalt qhob. Nws lwm qhov kev siv lub ntsiab yog nyob rau hauv asphalt waterproofing khoom, suav nrog vov tsev noo-pov thawj-pov thawj rau cov ru tsev tiaj tiaj.

Asphalt tov cov txheej txheem ntau lawm muaj kev sib xyaw granite aggregates thiab asphalt kom tau txais kev sib xyaw zoo li ascalt. Lub txiaj ntsig sib tov yog dav siv los ua txoj kev pua khoom. Feem ntau ntawm cov txheej txheem hluav taws xob yog siv rau kom qhuav thiab cua sov cov aggregates. Tam sim no cov kev ua txhaum cov ntaub ntawv muab cov khoom siv asphalt tshiab uas tau sib xyaw ua ke rau cov khoom siv niaj hnub no, kev ua haujlwm tau zoo, kev tsim khoom zoo, kev tsim khoom zoo, kev tsim khoom zoo, kev tsim khoom zoo, kev tsim khoom zoo, kev tsim khoom zoo, kev tsim khoom zoo, kev tsim khoom zoo, kev tsim khoom zoo, kev tsim khoom zoo, kev tsim khoom zoo, kev tsim khoom zoo, kev tsim khoom zoo, tsim tau zoo zoo asphalt. Txoj cai zoo yog ib qho tseem ceeb ntawm kev lag luam.
Winoroader Group Siv cov khoom lag luam tshiab thiab kev siv khoom siv tau zoo, ua kom muaj kev tiv thaiv zoo, ua kom muaj kev tiv thaiv zoo, ua kom tau cov khoom lag luam tsis xws luag thiab qhia cov xyoo dhau los.