Asph alt pob zeb yog npaj los ntawm ib qho tshwj xeeb muaj pes tsawg leeg nrog qhov tseeb proportions ntawm cov khoom tshwj xeeb: xuab zeb, ntxhia hmoov, crushed pob zeb ntawm ntau qhov ntau thiab tsawg, nrog rau qee yam bitumen npaj rau txoj kev. Asph alt pob zeb sib tov yog siv los npaj lub hauv paus thiab npog txoj kev hauv yuav luag txhua yam kev mob. Koj tuaj yeem xav txog cov ntaub ntawv no kom ntxaws ntxiv.
Asph alt pob zeb sib xyaw yog muab faib ua kub thiab txias raws li txoj cai tso. Cov qub yog cov nto moo tshaj plaws thiab nquag siv niaj hnub no. Lawv tso rau ntawm qhov kub ntawm 140-170 degrees Celsius. Qhov sib tov kub asph alt tiav yog xa los ntawm cov khoom siv tshwj xeeb. Nws txuag qhov kub ntawm qhov muaj pes tsawg leeg. Thaum paving tiav, compaction yog nqa tawm nrog asph alt rollers. Tom qab qhov muaj pes tsawg leeg hardens, cov txheej txheem zoo tau txais.
Kev sib tov yog nqa tawm siv cov kua qaub bitumen. Cov sib tov yuav tsum tau siv tam sim ntawd tom qab kev npaj, nws yuav tsum tsis txhob cia txias. Thaum tso cov asph alt kub yuav tsum yog 120 degrees lossis ntau dua. Cov tshuab no yog siv rau txhua qhov haujlwm thiab yuav luag txhua qhov latitudes. Muaj cov yam ntxwv me me. Cov txheej txheej saum toj kawg nkaus ntawm cov txheej txheej yog nteg nrog lub luag haujlwm ntawm kev siv cov pob zeb crushed, qhov feem ntawm qhov yog 20-40 millimeters, uas cuam tshuam rau tag nrho cov nqi ntawm kev ua haujlwm. Kub mix asph alt qhob yog qhov ua tau zoo tshaj plaws nyob rau tam sim no, uas tuaj yeem ua tiav los ntawm kev siv bitumen. Txoj kev no muaj lwm qhov txiaj ntsig tseem ceeb - qhib kev txav mus los hauv thaj chaw kho mob yog ua tau tam sim ntawd tom qab qhov sib tov tau txias rau qhov kub thiab txias, uas yog, nws yuav siv sijhawm li ob peb teev xwb. Lub sijhawm no yog txaus rau qhov sib tov kom muaj sijhawm los ntawm kev tsim cov theem, tom qab ntawd nws tau npaj txhij rau kev siv.
Yog tias cov pob zeb asph alt sib tov raug xaiv los ua cov khoom siv rau kev kho cov haujlwm ntawm txoj kev, ces lawv cov kev sib xyaw yuav tsum raug xaiv kom ze li qhov ua tau rau cov khoom kho. Nrog rau qhov tsis xws luag qhov tob txog li tsib centimeters, nteg yog nqa tawm nyob rau hauv ib txheej, thiab nrog ib tug loj loj potholes, ob peb txheej yuav tsum tau siv. Cov chaw me me yuav tsum tau compacted nrog cov khoom siv pneumatic, thaum cov cheeb tsam loj yuav tsum tau compacted nrog vibratory roller.
Ntau hom asph alt pob zeb sib tov yog siv rau kev npaj ntawm tshav dav hlau thiab txoj kev chaw, hydraulic qauv,pem teb thiab lub ru tsev tiaj tus. Kev yuav khoom ntawm cov ntaub ntawv no yuav tsum tau ua nyob rau hauv cov lag luam ua haujlwm nrog kev ua raws li kev tswj hwm nruj ntawm tag nrho cov txheej txheem thev naus laus zis ntawm lawv cov khoom tsim, thiab tus nqi yuav zoo dua. Nws yog qhov tseeb tias cov nplua-grained asph alt mix yuav raug nqi ntau dua, vim nws yog cov khoom lag luam zoo dua uas tsim los rau kev teeb tsa qhov chaw du heev. Feem ntau, tus nqi ntawm cov khoom siv hauv tsev yog nyob ntawm ntau yam, ntawm qhov zoo ntawm cov khoom, cov cuab yeej siv thiab cov thev naus laus zis siv hauv kev ua haujlwm, nrog rau ntau yam tseem ceeb heev.
