Cov nroj tsuag Asphalt muaj zog yog tsim rau pob zeb macast Asphalt ntau lawm thiab peb tsis tsuas yog cov neeg ua haujlwm cellulose, tab sis kuj tom qab muag kev ua haujlwm pab txhawb nqa thiab kev kawm ua haujlwm.

Sma yog tus nyias nyias (12.5-40 mm) gap-graded, hma uas siv los ua kev tsim kho kom tsim kho thiab rov txuas ntxiv. Nws yog sib xyaw ntawm Asphalt Mement, ntxhib aggregate, zuaj xuab zeb, thiab ntxiv. Cov kev sib xyaw no txawv ntawm qhov qub qib hma mixes nyob rau hauv uas muaj ntau ntau dua ntawm coarse aggrate hauv sma mix. Nws tuaj yeem siv rau txoj kev loj loj nrog cov tsheb khiav hnyav. Cov khoom no muab ib lub rooj sib tw tiv thaiv kev coj ua thiab kev tawm tsam mus rau qhov kev txiav txim siab abrasive ntawm cov log tsheb studded. Daim ntawv thov no tseem muab cov kev laus laus qeeb thiab qhov tsis tshua muaj kub-kub.

SMA yog siv los ua kom ntau tshaj qhov kev sib cuam tshuam thiab kev sib cuag ntawm cov coarse aggrate feem hauv HMA. Asphalt Mement thiab Finer Aggregate ib feem muab cov uas tuav lub pob zeb kom ze. Kev tsim qauv tsim tshwj xeeb feem ntau muaj 6.0-7.0% muab cov lej sib xyaw ua ke (100% Cov fibers feem ntau siv los tswj lub ntsej muag thiab qhov no txo ​​cov dej ntws tawm ntawm phau ntawv sib xyaw. Voids yog ib txwm khaws cia ntawm 3% thiab 4%. Qhov ntau tshaj plaws qhov ntau thiab tsawg los ntawm 5 txog 20 hli (0.2 mus rau 0.8 hauv.).

Kev sib xyaw, tsheb thauj mus los, thiab qhov kev kawm ntawm SMA siv cov khoom siv sib haum thiab kev coj ua nrog qee qhov hloov pauv. Piv txwv li, siab dua sib xyaw ua kom sov ntawm txog 175 ° C (347 ° F) feem ntau tsim nyog vim tias ntawm coarser asphalt nyob rau hauv sma mixes. Tsis tas li, thaum cellulose fibers yog siv, lub sijhawm sib xyaw yuav tsum tau nce ntxiv kom tso cai rau kev sib xyaw kom zoo. Dov pib tam sim ntawd tom qab kev tso kawm ua tiav qhov ceev sai ua ntej kev sib xyaw kub qis dua. Kev sib piv yog feem ntau ua tiav los ntawm kev siv ntawm 9-11 tonne (10-12 nyhav ib toos) hlau-rolled chais. Vibratory yob kuj tseem yuav siv nrog kev ceev faj. Piv rau ib txwm ntom-graded HMA, SMA muaj qhov zoo dua shear tsis kam, tawg tsis kam, thiab yog sib npaug rau cov suab nrov. Cov lus 10.7 sawv cev rau kev sib piv ntawm kev kawm ntawm SMA siv hauv Tebchaws Asmeskas thiab Europe.