Paving asphalt nyob rau hauv qhov nqaim los yog qhov chaw txwv tsis pub-xws li cov kev taug kev, cov tsheb kauj vab, cov chaw nyob, cov chaw siv hluav taws xob, thiab cov chaw kho hauv nroog- yuav tsum tau xaiv cov khoom siv ceev faj ntau dua li - txoj kev loj. Qhov chaw ua haujlwm tsawg, kev ua haujlwm ceev ceev, thiab cov khoom siv me me txhua qhov chaw xav tau ntau dua ntawm kev ua haujlwm asphalt. Kev xaiv txoj cai asphalt tsis tsuas yog cuam tshuam rau kev tsim kho, tab sis kuj txiav txim siab ntev -lub sij hawm pavement durability thiab tsos. Hauv qab no yog ib qho kev lag luam- tsom xam cov ntsiab lus ntawm cov asphalt zoo tshaj plaws rau qhov nqaim- thaj chaw paving thiab cov yam tseem ceeb tom qab lawv xaiv.
Ua ntej, kev sib xyaw kub asphalt (HMA) tseem yog qhov kev xaiv siv dav tshaj plaws rau nqaim - thaj tsam paving tej yaam num. HMA muaj kev ua tau zoo ntawm cov qauv, kev thauj khoom zoo heev -cov kabmob muaj peev xwm, thiab lub neej ua haujlwm ntev. Rau cov chaw kaw, nplua -qib lossis nruab nrab- qib HMA feem ntau yog nyiam. Muab piv nrog cov ntxhib- qib sib xyaw, nplua - qib asphalt yooj yim dua rau kev sib kis thiab qib ntawm tus kheej, tso cai rau cov neeg ua haujlwm kom ua tiav cov npoo du thiab huv si thaum siv cov pavers lossis cov cuab yeej siv tes. Nws txoj kev ua haujlwm zoo dua ua rau nws tshwj xeeb tshaj yog haum rau kev taug kev thiab kev hauv nroog me me.
Qhov thib ob, sov sib xyaw asphalt (WMA) tau nce siab rau qhov nqaim thiab hauv nroog paving ib puag ncig. WMA yog tsim thiab muab tso rau ntawm qhov kub qis dua li cov tsoos kub sib xyaw asphalt, uas muaj ntau qhov zoo hauv qhov chaw kaw. Qhov ntsuas kub qis dua txhim kho lub sijhawm ua haujlwm, tso cai rau cov neeg ua haujlwm tau yooj yim dua thaum ua haujlwm hauv cov xwm txheej nruj lossis thaum cov khoom thauj khoom luv luv. Tsis tas li ntawd, txo cov pa taws thiab emissions ua rau WMA zoo dua rau cov chaw kaw lossis ib nrab -cov chaw kaw xws li cov kunnels, cov chaw nres tsheb hauv av, thiab cov zej zog uas muaj neeg coob coob.
Thib peb, kev sib xyaw txias asphalt feem ntau yog siv rau me me - kho qhov chaw nqaim es tsis yog cov paving tag nrho. Kev sib xyaw txias tuaj yeem khaws cia rau lub sijhawm ntev thiab tsis tas yuav tsum tau cua sov, ua kom yooj yim rau kev kho thaum muaj xwm txheej ceev, patching, thiab qhov chaw ib ntus. Txawm li cas los xij, nws lub zog txhua yam thiab kev ua haujlwm ntev yog feem ntau qis dua kub lossis sov asphalt sib xyaw. Yog li ntawd, kev sib xyaw txias yog qhov zoo tshaj plaws rau qhov qis - thaj chaw tsheb thauj mus los lossis luv luv - kev daws teeb meem kom txog rau thaum paving mus tas li.
Plaub, polymer-hloov asphalt (PMA) yog qhov kev xaiv zoo tshaj plaws rau cov cheeb tsam nqaim uas muaj kev ntxhov siab ntau dua lossis hnyav ib puag ncig. Los ntawm kev sib koom ua ke ntawm cov polymers, PMA muab kev txhim kho yooj yim, tiv thaiv kev tawg, thiab txhim kho rutting kev ua tau zoo. Qhov no ua rau nws zoo tagnrho rau txoj kev nqaim hauv nroog uas nquag nres, tig, lossis cov khoom hnyav ua rau muaj kev ntxhov siab ntawm qhov dav dav ntawm txoj kev pavement. Txawm hais tias PMA muaj tus nqi khoom siv ntau dua, nws lub neej kev pab cuam ntev dua tuaj yeem txo qhov kev saib xyuas ntau zaus hauv qhov chaw kaw qhov chaw kho mob cuam tshuam thiab kim.
Thib tsib, nyias overlay asphalt sib tov yog feem ntau xaiv rau nqaim - cheeb tsam resurfacing. Cov khoom sib xyaw no yog tsim los rau nyias - txheej daim ntawv thov thaum tseem muab kev ua haujlwm zoo thiab ua haujlwm ntev. Nyias overlays yog tshwj xeeb tshaj yog pab tau nyob rau hauv qhov siab txwv, xws li nyob ze curbs, ntws systems, los yog lub tsev nkag, thiab qhov twg milling qhov tob yuav tsum tau txo.
Tshaj li hom kev sib xyaw, qhov sib sau loj thiab kev sib tw ua lub luag haujlwm tseem ceeb. Qhov loj tshaj plaws sib sau ua ke me me txhim kho kev sib sau ua ke nrog cov menyuam me thiab taug kev- tom qab cov cuab yeej siv, ua kom muaj kev sib txuam zoo txawm tias nyob hauv cov ces kaum thiab cov npoo. Kev gradation zoo ib yam kuj yuav pab txo qis kev sib cais thaum lub sij hawm phau ntawv sib kis.
Hauv kev xaus, xaiv asphalt rau nqaim - thaj tsam paving yog hais txog kev sib npaug ntawm kev ua haujlwm, kev ua haujlwm ntev, kev cuam tshuam ib puag ncig, thiab kev txwv kev tsim kho. Fine-qib kub sib xyaw asphalt, sov sib xyaw asphalt, polymer- hloov kho asphalt, thiab nyias txheej sib xyaw yog txhua yam siv, nyob ntawm kev thauj mus los thiab qhov chaw nyob. Raws li kev tsim kho hauv nroog txuas ntxiv ua qhov tseem ceeb ntawm kev cog lus thiab kev ua paving, xaiv txoj kev asphalt sib xyaw ua ib qho tseem ceeb xws li xaiv cov cuab yeej zoo.