Txoj kev tam sim no thiab cov pavements tau hloov pauv ntau yam: cov tsheb thauj mus los thiab kev tsav tsheb ntau zaus tau nce ntxiv, lub qag load ntawm cov tsheb thauj khoom tau nce ntxiv, kev tsav tsheb ib txoj hauv kev sib cais tau siv dav, thiab cov kev cai tau txhim kho ntxiv kev tiv thaiv kev khiav. tiv thaiv hauv av, uas yog, kev ua haujlwm ntawm cov khoom siv hloov kho bitumen nyob rau hauv qhov kub thiab txias muaj peev xwm;
Txhim kho softness thiab toughness, uas yog, muaj peev xwm tiv thaiv cracking ntawm tsawg kub; txhim kho hnav tsis kam thiab ua kom ntev kev pab cuam lub neej. Cov tsev niaj hnub no dav siv ntev-ntev prestressed steel ru tsev, xav tau cov ntaub ntawv sab nrauv phab ntsa waterproofing los ua ke rau hauv loj offsets. Lawv kuj tuaj yeem tiv taus qhov kub thiab txias huab cua tsis zoo, muaj kev ua haujlwm zoo dua, ua rau nws tus kheej-nplaum, yooj yim rau kev tsim kho, thiab txo cov haujlwm ua haujlwm.

Qhov kev hloov pauv no tshwm sim los ntawm kev siv ib puag ncig ntuj tsim teeb meem loj rau kev ua haujlwm ntawm cov khoom siv hloov kho bitumen. Cov tib neeg tau txuas qhov tseem ceeb heev rau kev hloov kho bitumen cov ntaub ntawv hloov kho kom haum rau cov ntawv thov nruj saum toj no. Hloov kho bitumen cog cov ntaub ntawv tsis muaj dej tsis zoo thiab cov txheej txheem vaj tsev feem ntau pom cov txiaj ntsig zoo hauv qee qhov haujlwm engineering.
Txawm li cas los xij, vim tias tus nqi ntawm cov khoom siv raw tom qab hloov kho cov khoom siv bitumen feem ntau yog 2 mus rau 7 npaug siab dua li cov hloov kho bitumen zoo tib yam, cov neeg siv khoom tsis nkag siab tag nrho cov yam ntxwv ntawm cov khoom siv, thiab cov khoom ntim ntawm bitumen pob zeb nce qeeb. Niaj hnub no txoj kev hloov kho bitumen feem ntau yog siv rau paving nyob rau hauv cov chaw tshwj xeeb xws li kev khiav dej num, txoj kev tsis muaj dej tsis zoo, cov chaw nres tsheb hauv av, cov chaw ua si, cov chaw tsheb loj, kev sib tshuam thiab cov ces kaum hauv av. Nyob rau lub sijhawm no, cov pob zeb bitumen tau siv rau kev saib xyuas thiab kev txhawb nqa ntawm txoj kev sib txuas, uas tau txhawb nqa kev siv dav ntawm kev hloov kho cov khoom siv txoj kev bitumen.