Thaum siv cov nroj tsuag li asphalt sib tov, ua ntej txhua tus, nws xav tau kev ruaj khov zoo. Yog tias nws tsis muaj kev ruaj khov zoo, tom qab ntawd lub asphalt sib tov yuav tsis muaj peev xwm ua tau raws li qhov yuav tsum tau ua ntawm txoj haujlwm uas yuav tsum tau ua lossis ntau lawm. Rau kev siv kev siv, ntsuas ntsuas yuav tsum ua asphalt ua yog nruj me ntsis thiab meej. Tsuas yog tsim nyog asphalt qhob cij qhob qhob ua rau txoj kev kev tsim kho kom haum raws li qhov ua tau tiag tiag. Yog li ntawd, qhov ruaj khov ntawm cov asphalt sib tov yog qhov tseem ceeb heev.

Qhov thib ob, cov kev xav tau rau cov nroj tsuag liphalt mixing thaum siv yog tias cov khoom siv yuav tsum tau yooj yim li sai tau, thiab cov haujlwm tag nrho yuav tsum tau txo kom ntau li ntau tau. Qhov no tuaj yeem txuag tau ntau lub manpower kev tawm tswv yim thaum lub sijhawm ua haujlwm thiab khaws cov nqi coj. Txawm hais tias nws yooj yim, nws tsis txhais tau tias cov thev naus laus zis ntawm cov asphalt sib tov cog cov nroj tsuag kom txo qis.
Qhov saum toj no yog qhov yuav tsum tau hais tias asphalt tov cog, vim yog tias muaj cov txiaj ntsig kev ua haujlwm kom ua tiav, cov khoom siv yuav tsum muaj cov xwm txheej sib raug zoo. Nws yuav tsum yog ib qho tsim nyog thiab yooj yim cov khoom siv kom ntseeg tau tias ua tau zoo thiab ua haujlwm zoo ntawm kev ua haujlwm.