Kev ua lag luam txua ntxiv ua lag luam asphalt sib xyaw yog ib txheej txheej ua tiav cov khoom siv uas tau tsim cov khoom siv rho tawm. Nws muaj cov yam ntxwv ntawm kev ua haujlwm txuas ntxiv, uas tuaj yeem txhim kho kev ua tau zoo, txo qis kev siv zog, thiab txo kev siv zog ua haujlwm. Kev tso tsheb hlau luam tsis tu ncua Txoj kev tsim khoom no tuaj yeem ua tiav loj-teev thiab high-efficoniticess ntau lawm, thiab yog tsim nyog tshwj xeeb rau cov txheej txheem loj-ntsuas tshuab.