Ingabe Ukuvuselela I-RAP Ezitshalweni Ze-Asphalt Ezishisayo Kungazinciphisa Ngempela Izindleko Ngaphandle Kokudela Ikhwalithi?

Kungani Imboni Imatasa Ngokusebenzisa Kabusha I-RAP Ezitshalweni Ze-Asphalt Ezishisayo

Shayela udlule kunoma iyiphi indawo yesimanje yokwakha imigwaqo futhi cishe uzobona ibhanela eliqhosha ngokuthi “i-asphalt eluhlaza.” Ngemuva kwesiqubulo kukhona inguquko ethule: i-rap ivuselela izitshalo ze-asphalt ezixubile ezishisayo eziguqula umgwaqo wangaphambilini ube yindawo yokushayela yanamuhla. Kodwa ingabe le nqubo isindisa imali ngempela, noma imane nje iyizinto zokumaketha ezinobungani nemvelo? Ake sisuse izendlalelo—akukho lutho olubi, akukho nkulumo yokuthengisa, izinombolo kanye nezindaba ezibalulekile kuphela.

Yini Ebhekwa Njenge-RAP?

I-Reclaimed Asphalt Pavement (RAP) akuyona nje "izinto ezindala ezimnyama." Yizigayo ezicutshungulwayo ezisene-bitumen ebalulekile kanye nama-aggregate asezingeni eliphezulu. Uma zihlukaniswa kahle futhi zihlolwe, i-RAP ingathatha indawo ka-15-40% wezinto ezingavuthiwe ku-hot-mix entsha. Kwezinye izifundazwe, imininingwane ye-DOT ivumela amaphesenti aphezulu nakakhulu uma ingxube ihlangabezana nezindinganiso zokusebenza. Ukuhumusha: osonkontileka abanekhono lokusebenzisa i-RAP bangabhida phansi ngenkathi besathola amamajini anempilo.

Indlela Abasebenzisa Kabusha Abakhulisa Ngayo Ukushisa Ngaphandle Kokushisa Isabelomali

Ukukhathazeka kwendabuko mayelana ne-RAP kugxile ekushiseni ngokweqile i-bitumen esele, okubangela ukuguga ngaphambi kwesikhathi. Isigubhu sesimanje esihambisanayo esinomshini wokungena ophakathi kanye nezinhlelo zokugeleza kwe-double-barrel zixazulula lokhu ngokushisa i-virgin aggregate kuqala, bese kungeniswa i-RAP phansi kwesigubhu. Ngenxa yokuthi amatshe ashisa kakhulu adlulisela amandla ku-RAP esikhundleni selangabi elivulekile, i-bitumen “ayipheki.” Umphumela? Umswakama uyaphela, kodwa i-binder igcina ukuqina kwayo. Icocekile, akunjalo?

Ukuchaza i-ROI ku-RAP

Cabanga ngesitshalo esingama-tph angu-200 esisebenza amahora angu-2,000 ngonyaka. Uma unama-RAP angu-25%, uthatha indawo yalokhu okulandelayo:

• I-50 tph ye-virgin aggregate ibiza u-$12 ton → i-won yonyaka engu-$1.2 M
• 5% ye-bitumen ku-$550 ton → kugcinwe enye i-$1.1 M
• Izimali zokulahla udoti/zokuthutha zigwenyiwe → cishe u-$200 k

Uma uzihlanganisa, uzobheka u- $2.5 M ngonyaka ngaphambi kwentela. Ngisho nangemva kokubala izikrini ezengeziwe zokucubungula i-RAP, ama-moisture probe, kanye nama-vapor suppressants, isikhathi sokukhokha ngokuvamile singaphansi kwezinyanga ezingu-18. Akukho ushintsho olulula nganoma iyiphi indlela.

Izithiyo Ezisezingeni Eliphezulu—Nendlela Yokuzigwema

Abangabaza bathi ukuxubana kwe-RAP ephezulu kulula kakhulu. Iqiniso liwukuthi, ukuqhekeka kwenzeka lapho izitshalo "ziyisonga" ngaphandle kokulinganisa ibanga le-binder elisetshenzisiwe. Ukulungiswa kuwukuhlaziywa kwe-binder ehlanganisiwe: khipha bese ubeka izinga le-RAP binder, bese unquma ukuthi uzoyithambisa nge-rejuvenator noma uyibeke nge-virgin binder ethambile. Izitshalo ezilandela iphrothokholi ye-ASTM D8159 zihlala zifinyelela amamaki e-PG aqondiwe futhi ziphumelele emikhawulweni ye-Illinois Flexibility Index Test (I-FIT). Ngamafuphi, ikhwalithi ayiyona inkinga uma wenza umsebenzi wakho wesikole.

Umswakama: Umbhubhisi Othule

Njalo nge-1% yomswakama osele ku-RAP weba ~10 °C izinga lokushisa lakho elihlanganisiwe elisebenzayo. Lokho kusho ukuthi ushisa uphethiloli owengeziwe noma ubeka engcupheni ukuthamba kwamalunga. Indlela yokuxazulula inkinga? Ukuhlolwa komswakama kwezigaba ezintathu :

1. Gcina i-RAP endaweni ye-asphalt ethambekele enezinga elingu-2% lokukhipha amanzi.
2. Mboza ingxenye ephezulu nge-geotextile ephefumulayo—ishibhile kodwa inciphisa ukumuncwa kwemvula ngesigamu.
3. Sebenzisa izinzwa ze-microwave eziqondile ebhandeni lokuphakelayo okubandayo; izitshalo ezisebenzisa lokhu kulungiswa zibika umswakama wokugcina ongu-0.8%, ophansi ngokwanele ukuze kukhiqizwe ngaphandle komusi oluhlaza okwesibhakabhaka.

Ngithembe, le mininingwane emincane ihlukanisa ochwepheshe kulabo abafuna umsebenzi.

Indawo Elawulayo: Lapho Imali Yamahhala Ikhona

Izifundazwe ezifana neTexas, iMissouri, neGeorgia manje sezinikeza izikhuthazo ngethani ngalinye ngezingxube ezine-≥20% ye-RAP. Ikhredithi ingaba ngu-$2–$5 ngethani, kuye ngokuthi i-tonnage kanye namabhonasi obuningi akhona endaweni. Emsebenzini kahulumeni wamathani angu-50 000, lokho kungenzeka ukuthi kungama-$250 k emuva ephaketheni lakho—ngaphandle kokuthinta ngisho nokonga kwezinto esikubalile ngaphambilini. Uma ungabhidi kulezo zifundazwe, ungase ufune ukuhlala uqaphile; izinhlelo zezikhuthazo zisakazeka ngokushesha kunamahemuhemu ngosuku lokukhokha.

Icala Elibalulekile: I-Interstate 35 e-Oklahoma

Ngesikhathi sokuvuselelwa kabusha kuka-2022, unkontileka wasebenzisa ingxube ye-RAP engu-35% ene-rejuvenator esekelwe ku-bio. Lokhu kwakudinga okungenani izikhala zomoya ezingu-8% kuma-gyration angu-75 kanye nesilinganiso samandla okudonsa ≥80. Akukhona nje ukuthi ingxube yadlula, kodwa iphrojekthi yafika ku- 12% ngaphansi kwesabelomali futhi yatholela unkontileka isikhuthazo esengeziwe sama-$180k. Ama-cores athathwe ngonyaka owodwa kamuva awabonisi bufakazi bokuqhekeka noma ukushisa. Ngakho-ke yebo, ukusebenza kwangempela kusekela idatha yelabhorethri.

Ukuqinisekisa Ikusasa: Yini Elandelayo Ngokusebenzisa Kabusha Kwe-RAP?

Abakhiqizi bezitshalo bazama izithasiselo ezifudumele ezisezingeni eliphansi ezivumela i-50% RAP ku-275 °F esikhundleni se-320 °F evamile. Amazinga okushisa aphansi asho i-oxidation encane, intela yekhabhoni ephansi, kanye nomakhelwane abajabule kakhulu abangafoneli izikhalazo zomusi. Okwamanje, umswakama kanye ne-probe yokushisa eqhutshwa yi-AI kuyanciphisa ukuguquguquka; izitshalo zibika ukuphambuka okujwayelekile kokuqukethwe kwe-binder okwehla kusuka ku-0.4% kuya ku-0.15%. Umbhalo odongeni? Phakathi neminyaka emihlanu, i-40% RAP ingaba yinto evamile entsha, hhayi okuhlukile.

Uhlu Lokuhlola Olusheshayo Lokuqala Kusasa Ekuseni

Uma usebenzisa indawo yokuxuba okushisayo futhi ufuna ukufaka iminwe yakho ekusetshenzisweni kabusha kwe-RAP, nansi iphakethe lokuqala elilula:

• Oda i-retrofit yokuphakelwa okubandayo okunamabhini amathathu ukuze kuhlukaniswe i-RAP ngamaqhezu osayizi.
• Faka i-chute yokukhipha amasampula e-pneumatic ukuze uchwepheshe wakho we-QC akwazi ukuthola i-RAP njalo ngamathani angu-500.
• Thola inkontileka eyunivesithi yendawo yokukhipha nokufaka ama-binder—kubiza cishe u-$150 ngesampula ngayinye kodwa kukusindisa ekwehlulekeni kwenani.
• Xoxa ngentengo eshintshashintshayo nomhlinzeki wezinto zokuvuselela; abathengisi abaningi bazokhipha ama-5 000 gal okuqala uma usayina isivumelwano sonyaka owodwa sokunikezela.

Yenza lezi zinto ezine bese uzokwazi ukuphumelela—akudingeki iziqu zesayensi yerokhethi.

Umugqa Ophansi

Ingabe izitshalo ze-asphalt ezisebenzisa kabusha i-rap ezixutshwe ne-hot mix zinganciphisa izindleko zezinto zakho ngaphandle kokonakalisa ikhwalithi? Impela—uma uphatha i-RAP njengento eluhlaza, hhayi ukuchitha. Tshala imali ekuhlukaniseni, qapha umswakama njengokhetshe, bese ulandela ukwakheka kwengxube okusekelwe ekusebenzeni. Inzuzo ishesha: izindleko eziphansi, iziqinisekiso eziluhlaza, kanye namabhidi anqoba umncintiswano. Futhi he, ubani ongathandi i-zero eyengeziwe emgqeni wenzuzo?