Izisombululo zezityalo zeAsphalt zeRAP zinganciphisa njani iindleko ngaphandle kokubeka umgangatho esichengeni?
Wakha wazibuza ukuba kutheni abanye abakhi beendlela beqhubeka bephumelela kwiibhidi ngelixa amaxabiso ezinto zokwakha eqhubeka enyuka? Imfihlo idla ngokuba ngaphakathi kwizisombululo zabo ze-rap recycling hot mix asphalt plants — ubuchwepheshe obubuyisela ukuya kuthi ga kwi-60% ye-asphalt endala kwaye bunciphise iindleko zezinto eziluhlaza zibe yisiqingatha. Makhe sijonge amaqhinga okwenyani aguqula iziqwenga zeendawo zokupaka zibe yinzuzo. (Kwaye ewe, siza kuphinda sichithe ixesha elithile kutshintsho olunye olunokukongela i-$0.40 eyongezelelweyo ngetoni nganye.)
Yintoni kanye kanye iRAP, kwaye kutheni ibalulekile kwimveliso ye-HMA yanamhlanje?
I-Reclaimed Asphalt Pavement (RAP) ayisekho nje “i-millings”; yimpahla enokubhatalwa. Itoni nganye oyisebenzisa kwakhona ithetha ukuba itoni enye ye-virgin aggregate kunye ne-binder ekufuneka uyithenge incinci. Ngo-2023, i-liquid AC binder yayixabisa i-$650 ngetoni emfutshane kwi-US Gulf Coast. Xuba i-30% RAP kumxube wakho kwaye ukhupha phantse i-$200 kwitoni nganye ye-asphalt egqityiweyo. Yiyo loo nto nokuba i-accountant yakho iya kukuxabisa kakhulu.
Zisebenza njani izisombululo zezityalo ze-Asphalt ze-Rap zanamhlanje?
Mhlawumbi ukhe wabona ii-drum dryers ezindala ezijikeleza i-RAP njenge-toast yangozolo. Izityalo ezibalaseleyo zanamhlanje zisebenzisa iijakethi zokudlulisa ubushushu ezichasene nokuhamba kunye nokufudumeza komswakama wesigaba somphunga . Inguqulelo: i-RAP ifudumala kancinci, ukuze i-bitumen eseleyo "ingagugi" okanye iqhekeke. Isiphumo? Umxube ohlangabezana ne-Superpave volumetrics ngaphandle kwedrama. Ezinye ii-OEM zongeza ii-infrared pyrometers ezifunda ubushushu obudibeneyo ngexesha langempela, zitshintsha ngokuzenzekelayo i-RAP feed ukuze ihlale ngaphakathi kwe-±3 °C ukusuka kwindawo ekujoliswe kuyo. Icocekile kakhulu, akunjalo?
Uphuculo lweZixhobo zeHardware Ezizihlawulelayo Kwiinyanga ezili-18
- Ii-conveyors ze-drag slat eziguquguqukayo : Zinciphisa ukutsala kwe-horsepower nge-25% kwaye zinciphisa ukuwohloka kwe-RAP.
- Izinto zokwahlula i-venturi ezinomphunga ophezulu : Susa i-80% yomswakama ngaphambi kokuba i-RAP ibethe idrama, nto leyo egcina i-burner fuel.
- I-pugmill enama-shaft amabini enokugcinwa kwemizuzwana eli-15 : Isusa umsi oluhlaza okwesibhakabhaka kwaye igcina abamelwane bakho bonwabile.
Ngaba Ungadlula i-40% ye-RAP Ngaphandle Kokwenza Ukusebenza Kobushushu Obuphantsi?
Impendulo emfutshane: ewe, kodwa kufuneka udlale ngekhemistri. I-Soft-grade virgin binder (PG 58-28) kunye ne-0.3% Sasobit okanye i-warm-mix additive efanayo yehlisa i-high-temperature esebenzayo ngenyathelo elinye kuphela ngelixa ibuyisela i-low-temperature ngamanyathelo amabini. I-Illinois DOT's 2022 pilot kwi-I-72 isebenzise i-45% RAP ngaloo ndlela yokupheka kwaye isaphumelele i-TSR (tensile-strength ratio) kwi-85%. Ngoko ke, akukho zizathu "esingenakukwazi ukuya phezulu kune-25%", bantu.
Kuthekani Ngezinto Ezikhupha Umoya? Ngaba Abalawuli Baza Kundivala?
Imida ye-EPA MACT ye-PM2.5 yi-0.04 gr/dsf. Isityalo esine- baghouse ye-reverse-pulse kunye ne -dry lime injection siwela lula kwi-0.01 gr/dsf nokuba umxholo we-RAP ufikelela kwi-50%. Icebiso elihle: yenza uvavanyo lwekota ye-stack ngexesha lasebusika—ubuninzi bomoya obandayo bunokutshintsha ukufundwa, kwaye awufuni ukuphazanyiswa kukwaphulwa kwe-opacity ngaphambi kwexesha lokuhamba.
I-ROI efihliweyo: Izohlwayo zeBaghouse njengeMineral Filler
Endaweni yokuzalisa ezo zigwegwe zinothuli, buyisela i-1–2% kumxube. Yi-filler yasimahla eyonyusa i-VMA nge-0.5% kwaye ikuvumela ukuba uchebe uthuli lwelimestone oluyi-virgin. Isityalo esinye se-200-tph esisihlolileyo eGeorgia songe i-$42 k ngonyaka ngolu hlengahlengiso. Asikuko utshintsho olukhulu, akunjalo?
Indlela Yokuqinisekisa Isityalo Sakho Kwixesha Elizayo Ukuze Sifumane I-60% RAP
Qala ngedrama enemigqomo emibini eyahlula iRAP kwindawo yelangatye ngqo. Yongeza indawo yokungena yeRAP eguquguqukayo —yisondeze kufutshane okanye kude nesitovu ngokuxhomekeke kumswakama. Okokugqibela, cacisa isixhobo sokusebenzisa kwakhona esinempendulo yebhulorho yokulinganisa ukuze inkqubo yolawulo lwesityalo ikwazi ukulungisa ngokuzenzekelayo ukushukuma kweetoni. Ezi ntshukumo zintathu zikulungiselela nantoni na iDOT eza kuyiphosa kuwe kwiminyaka elishumi ezayo.
Isifundo seTyala: Indlela ePhakamileyo yeSizwe eyi-38-Mile eColorado
Iprojekthi yayifuna i-110 000 t ye-12.5-mm SMA. I-Spec caped RAP kwi-30%, kodwa ikontrakta ibize kwi-40% esebenzisa le seti ingasentla. Ukonga okuseleyo: $1.9 M. Yintoni ebaluleke kakhulu? Ukusebenza kwendlela emva kwexesha lokuqandisa iqhwa kufumene amanqaku angama-92 kwi-PCR (uvavanyo lwemeko yendlela) xa kuthelekiswa nama-88 kwicandelo lolawulo olune-virgin mix. Kwanonjineli wendlela karhulumente uvumile wathi, “Asibonanga ukuba oko kuza.”
Iintsomi Eziqhelekileyo Ziyapheliswa
Intsomi: “Iingxubevange ze-high-RAP zihlala zingasebenzi.”
Inyani: Ukujika kuxhomekeke kwisakhiwo esipheleleyo, kungekhona kwipesenti ye-RAP. Sebenzisa umlinganiselo we-CA/FA osemgangathweni ofanelekileyo okufutshane ne-0.45 kwaye uza kulunga.
Intsomi: “I-RAP inee-hydrocarbons ezingaziwayo ezinuka kakubi.”
Ewe, ewe, ukuba usebenzisa isitshizi sakho esinamafutha amaninzi kwaye amaqondo obushushu afikelela kumantla angama-340°C. Gcina amaqondo obushushu e-stack engaphantsi kwama-160°C kwaye ivumba lehla liye kufikelela kwinqanaba le-BBQ kwindawo ohlala kuyo.
Uluhlu Lokujonga Olukhawulezileyo Ngaphambi Kokuba Uphinde Ulungelelanise
- Qinisekisa ukuba ii-silos zakho ziyakwazi ukusingatha i-10% eyongezelelweyo yomthamo wezinto eziphathekayo (i-RAP ithambile).
- Ukuphucula ii-trunnion; ii-RAP drums zisebenza nzima.
- Thetha ne-DOT yakho kwangethuba—amanye amazwe asabeka i-RAP kwi-25% kwi-SMA, kodwa vumela ukuba ubonise idatha yelabhoratri.
Ngaba ukulungele ukutsala yonke imali yokugqibela kwizisombululo zakho ze-rap recycling hot mix asphalt plants? Qala nge-moisture probe, yongeza i-VFD kwi-RAP feed, kwaye ubukele i-saving curve yakho itshintsha ibe yi-hockey-stick. Kwaye, ukuba ufuna ukuntywila nzulu kwi-burner tuning okanye i-additive dosages, nceda usinike umgca—happy paving!
