Cov khoom noj tawm me ntsis tsim los ntawm asphalt tov khoom siv ntau yam, tab sis nag lossis daus tshwm sim thaum lub sijhawm cia. Nov puas yog? Dab tsi ua rau qhov tshwm sim no?
Qhov tseeb, nws yog heev li cas rau bitumen mus nag los daus thaum nws muaj, thiab nws tsis yog kho kom ntev li ntev raws li qhov yuav tsum tau ua. Txawm li cas los xij, yog tias nws tsis tau raws li cov kev siv kev siv yuav tsum tau, nws tuaj yeem kho los ntawm cov hau kev xws li cov roj-dej sib cais. Qhov laj thawj yog vim li cas bitumen precipitates yog vim hais tias qhov ntom ntawm cov dej yog qhov me me, ua rau stratification.

Qhov laj thawj yog vim li cas muaj cov roj slick ntawm bitumen nto yog vim muaj ntau npuas tsim thaum lub sijhawm ua emulsification. Tom qab cov npuas tawg, lawv nyob twj ywm saum npoo av, sib sau cov roj slick. Yog tias cov nplaim dej ntab ntab ntab ntab, do nws ua ntej siv kom yaj. Yog tias nws yog tom qab, koj yuav tsum tau ntxiv ib tus neeg sawv cev defoaming tsim nyog lossis tshem tawm maj mam tshem tawm nws.