Fais fab asphalt nroj tsuag yog tsim los rau pob zeb mastic asphalt ntau lawm thiab peb muaj ib tug module nyob rau hauv peb software system.Tsis tas li ntawd peb tsim cellulose dosing unit.Nrog peb cov neeg ua hauj lwm, peb muab tsis tau tsuas yog cog kev muag khoom, tab sis kuj tom qab-muag kev pab cuam thiab kev cob qhia neeg ua hauj lwm.

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 kev sib xyaw ntawm asphalt cement, coarse aggregate, crushed xuab zeb, thiab additives. Cov kev sib xyaw no txawv ntawm cov qib tuab tuab HMA sib xyaw hauv qhov muaj ntau dua ntawm cov ntxhib sib xyaw hauv SMA sib xyaw. Nws tuaj yeem siv rau ntawm txoj kev loj loj uas muaj cov tsheb loj loj. Cov khoom no muab cov rut resistant hnav cov chav kawm thiab tsis kam mus rau abrasive kev txiav txim ntawm studded log tsheb. Daim ntawv thov no kuj tseem muab kev laus qeeb thiab kev ua haujlwm kub qis.

SMA yog siv los ua kom muaj kev sib cuam tshuam thiab kev sib cuag ntawm cov khoom sib xyaw ua ke hauv HMA. Asphalt cement thiab finer aggregate feem muab cov mastic uas tuav lub pob zeb nyob ze. Cov qauv sib xyaw ua ke feem ntau yuav muaj 6.0-7.0% nruab nrab-qib asphalt cement (los yog polymer-hloov AC), 8-13% muab tub lim, 70% yam tsawg kawg nkaus ntau dua 2 hli (Tsis yog 10) sieve, thiab 0.3-1.5% fibers los ntawm hnyav sib tov. Fibers feem ntau yog siv los stabilize lub mastic thiab qhov no txo ​​qhov ntws tawm ntawm binder nyob rau hauv lub mix. Cov voids feem ntau khaws cia ntawm 3% thiab 4%. Qhov loj tshaj particle loj yog li ntawm 5 mus rau 20 hli (0.2 txog 0.8 nti).

Kev sib xyaw, kev thauj mus los, thiab kev tso kawm ntawm SMA siv cov khoom siv thiab kev coj ua nrog qee qhov kev hloov pauv. Piv txwv li, qhov sib xyaw ua ke siab dua ntawm 175 ° C (347 ° F) feem ntau yog tsim nyog vim yog coarser aggregate, additives, thiab viscosity siab asphalt hauv SMA mixes. Tsis tas li ntawd, thaum siv cellulose fibers, lub sij hawm sib tov yuav tsum tau nce ntxiv kom tso cai rau kev sib xyaw kom zoo. Rolling pib tam sim ntawd tom qab kev tso kawm kom ua tiav qhov ceev ceev ua ntej qhov sib tov kub txo qis. Compaction feem ntau ua tiav los ntawm kev siv 9-11 tonne (10-12 tuj) steel-wheeled rollers. Vibratory dov kuj tseem siv tau nrog ceev faj. Piv nrog rau cov qib siab-qib HMA, SMA muaj qhov zoo dua shear resistance, abrasion resistance, cracking resistance, thiab skid resistance, thiab sib npaug rau lub suab nrov. Table 10.7 sawv cev rau kev sib piv ntawm kev ua tiav ntawm SMA siv hauv Tebchaws Meskas thiab Europe.