Ngaba i-RAP Recycling kwiHot Mix Asphalt Plants ingazinciphisa ngokwenene iindleko ngaphandle kokuncama umgangatho?
Kutheni Eli Shishini Lixakekile Ngokusebenzisa I-RAP Kwizityalo Ze-Asphalt Ezishushu
Qhuba udlule nakweyiphi na indawo yokwakha iindlela zanamhlanje kwaye mhlawumbi uya kubona ibhanile eqhayisa "nge-asphalt eluhlaza." Emva kwesiqubulo kukho inguquko ezolileyo: i-rap iphinda isebenzise izityalo ze-asphalt ezixutywe ne-hot mix eziguqula indlela yangozolo ibe yindawo yokuqhuba yanamhlanje. Kodwa ngaba le nkqubo isindisa imali ngokwenene, okanye ingaba yinto nje yokuthengisa engenabungozi? Masihlube izinto—akukho nto ingenabungozi, akukho ntengiso, kuphela amanani kunye namabali abalulekileyo.
Yintoni kanye kanye ebalwa njenge-RAP?
I-Reclaimed Asphalt Pavement (RAP) ayisiyonto nje “izinto ezindala ezimnyama.” Zii-millings ezicutshungulwayo ezisene-bitumen exabisekileyo kunye nee-aggregates ezikumgangatho ophezulu. Xa zihlulwe kakuhle kwaye zivavanywa, i-RAP inokuthatha indawo ye-15–40% yezinto ezingafakwanga kwi-hot-mix entsha. Kwamanye amazwe, iinkcukacha ze-DOT zivumela iipesenti eziphezulu nangakumbi ukuba umxube uhlangabezana nemigangatho yokusebenza. Inguqulelo: abakhi abanobuchule bokusetyenziswa kwe-RAP banokubiza ixabiso eliphantsi ngelixa besafumana inzuzo esempilweni.
Indlela Abaphinda Basebenzise Izinto Eziphinda Bazisebenzise Abaziphucula Ngayo Ngaphandle Kokutshisa Uhlahlo-lwabiwo Mali
Iinkxalabo zemveli malunga ne-RAP zigxile ekutshiseni i-bitumen eseleyo, nto leyo ebangela ukwaluphala kwangethuba. I-drum yanamhlanje ehamba ngaxeshanye ene-mid-knife entry kunye neenkqubo ze-double-barrel counter-flow zisombulula oku ngokufudumeza i-virgin aggregate kuqala, emva koko zingenise i-RAP kude ne-drum. Ngenxa yokuba amatye ashushu kakhulu adlulisela amandla kwi-RAP endaweni yelangatye elivulekileyo, i-bitumen “ayipheki.” Isiphumo? Umswakama uyaphela, kodwa i-binder igcina ukuthamba kwayo. Icocekile, akunjalo?
Ukuhlalutya i-ROI kwi-RAP
Cinga ngesityalo se-200-tph esisebenza iiyure ezingama-2,000 ngonyaka. Xa unesiqulatho se-RAP esingama-25%, utshintsha:
- I-50 tph ye-virgin aggregate ixabisa i-$12 ton → i-$1.2 M yokonga ngonyaka
- I-5% yebhitumen kwi-$550 yeetoni → enye i-$1.1 yezigidi igciniwe
- Iindleko zokufunxa/zokuthutha impahla zithintelwe → malunga ne-$200 k
Zidibanise kwaye ujonge i-$2.5 M ngonyaka ngaphambi kwerhafu. Kwanasemva kokuba ubhalisele izikrini ezongezelelweyo zokucubungula i-RAP, ii-moisture probes, kunye ne-vapor suppressants, ixesha lokubuyisela lihlala lingaphantsi kweenyanga ezili-18. Akukho tshintsho lunzima nangayiphi na indlela.
Imiqobo Esemgangathweni—Nendlela Yokuyitsiba
Abathandabuzi bathi kulula ukuxuba i-RAP eninzi xa ixutywa i-crack. Inyani yile, ukuqhekeka kwenzeka xa izityalo "ziyijika" ngaphandle kokulinganisa i-recycled binder grade. Ukulungiswa kuhlalutyo lwe-blended binder: khupha kwaye ubeke i-RAP binder kwinqanaba, uze ugqibe ekubeni uyithambise na nge-rejuvenator okanye uyibeke nge-soft virgin binder. Izityalo ezilandela i- ASTM D8159 protocol zihlala zifikelela kumanqaku e-PG ajoliswe kuwo kwaye ziphumelele i-Illinois Flexibility Index Test (I-FIT). Ngamafutshane, umgangatho awuyonto inzima ukuba wenza umsebenzi wakho wesikolo.
Ukufuma: Umtshabalalisi Othuleyo
Yonke i-1% yokufuma eseleyo kwi-RAP iba ~10 °C yobushushu bakho obusebenzayo. Oko kuthetha ukuba utshisa ipetroli engaphezulu okanye ubeke emngciphekweni amalungu athambileyo. Isisombululo? Uvavanyo lokufuma olunezigaba ezintathu :
- Gcina i-RAP kwi-asphalt pad ethambekileyo enomgangatho we-2% wokukhupha amanzi.
- Gquma umphezulu nge-geotextile ephefumlayo—ixabiso eliphantsi kodwa inciphisa ukufunxwa kwemvula ngesiqingatha.
- Sebenzisa ii-microwave sensors ezikwi-inline kwi-cold-feed belt; izityalo ezisebenzisa olu hlengahlengiso zixela ukuba i-0.8% yokufuma kokugqibela, iphantsi ngokwaneleyo ukuvelisa ngaphandle komsi oluhlaza okwesibhakabhaka.
Ndithembe, ezi nkcukacha zincinci zahlula iingcali kwabo bafuna izinto ezintsha.
Indawo Elawulayo: Apho Imali Yasimahla Ikhoyo
Amazwe afana neTexas, iMissouri, kunye neGeorgia ngoku anikezela ngezibonelelo ngetoni nganye kwiingxubevange ezine-≥20% ye-RAP. Ikhredithi inokuba yi-$2–$5 ngetoni nganye, kuxhomekeke kwi-tonnage kunye neebhonasi zoxinano olukhoyo. Kumsebenzi karhulumente weetoni ezingama-50 000, oko kunokubangela ukuba ubuyisele i-$250 k epokothweni yakho—ngaphandle kokuchukumisa imali egcinweyo esiyibalileyo ngaphambili. Ukuba awubhidi kwezo zizwe, ungathanda ukuhlala ubukele; iinkqubo zokukhuthaza zisasazeka ngokukhawuleza kunamahemuhemu ngomhla womvuzo.
Ityala kwiNgcamango: I-Interstate 35 e-Oklahoma
Ngexesha lokuvuselelwa kwakhona ngo-2022, umakhi wasebenzisa umxube we-RAP we-35% kunye nomatshini wokuvuselela osekelwe kwi-bio. I-spec yayifuna ubuncinci i-8% yomoya ongasebenziyo kwi-75 gyrations kunye nomlinganiselo wamandla okutsalwa kwe-≥80. Lo mxube awuzange uphumelele kuphela, kodwa iprojekthi yayingaphantsi kwe-12% kwaye yafumana umakhi imali eyongezelelweyo ye-$180 k. Ii-cores ezithathwe emva konyaka azibonisi bungqina bokuqhekeka okanye ubushushu. Ngoko ke, ukusebenza kwehlabathi lokwenyani kuxhasa idatha yelabhoratri.
Ubungqina Bekamva: Yintoni Elandelayo Ngokusebenzisa iRAP Recycling?
Abavelisi bezityalo bazama ukusebenzisa izongezo ezifudumeleyo ezisebenzisa ubushushu obuphantsi ezivumela i-50% ye-RAP kwi-275 °F endaweni ye-320 °F eqhelekileyo. Amaqondo obushushu aphantsi athetha ukuba i-oxidation incinci, irhafu yekhabhoni ephantsi, kunye nabamelwane abonwabileyo abangatsaleli umnxeba xa bekhalaza ngengxolo yomlilo. Okwangoku, umswakama kunye neeprobe zobushushu eziqhutywa yi-AI ziyanciphisa ukuguquguquka; izityalo zibika ukuphambuka okuqhelekileyo kumxholo we-binder ohla ukusuka kwi-0.4% ukuya kwi-0.15%. Umbhalo oseludongeni? Kwiminyaka emihlanu, i-40% ye-RAP inokuba yinto eqhelekileyo entsha, hayi into eyahlukileyo.
Uluhlu oluKhawulezayo lokuqalisa kusasa kusasa
Ukuba usebenzisa indawo yokuxuba izinto ezishushu kwaye ufuna ukuzifaka kwiinzwane zakho kwi-RAP recycling, nantsi iphakheji yokuqalisa engenamsebenzi:
- Oda i-retrofit ye-cold feed ye-3-bin ukuze yahlule i-RAP ngamaqhezu obungakanani.
- Faka i-pneumatic sampling chute ukuze i-QC technician yakho ikwazi ukufumana i-RAP rhoqo emva kweetoni ezingama-500.
- Yenza isivumelwano neyunivesithi yasekuhlaleni ukuze ufumane ulwazi oluthe kratya malunga ne-$150 kwisampulu nganye kodwa ikusindisa ekubeni ufumane ulwazi olungasebenziyo.
- Thetha-thethana ngexabiso elihambayo nomthengisi wezinto zokuvuselela; uninzi lwabathengisi luya kuhlawula i-5 000 gal yokuqala ukuba usayina isivumelwano sonyaka omnye sokubonelela.
Yenza ezi zinto zine uze uphumelele—akukho sidanga sesayensi yerokhethi esifunekayo.
Okukwintsusa
Ngaba izityalo ze-asphalt ezisebenzisa i-rap kwakhona zinokunciphisa iindleko zezinto zakho ngaphandle kokonakalisa umgangatho? Ngokuqinisekileyo—ukuba uphatha i-RAP njengezinto eziluhlaza, hayi inkunkuma. Tyala imali kwi-fractionation, jonga umswakama njenge-hawk, kwaye ulandele uyilo lomxube olusekelwe ekusebenzeni. Inzuzo ikhawulezileyo: iindleko eziphantsi, iziqinisekiso eziluhlaza, kunye neebhidi ezoyisa ukhuphiswano. Kwaye, ngubani ongathandi zero eyongezelelweyo kumgca wenzuzo?
