Puas Yog RAP Rov Siv Dua Hauv Cov Chaw Tsim Asphalt Kub Sib Xyaws Yeej Txo Tau Cov Nqi Yam Tsis Txo Qhov Zoo?
Vim li cas kev lag luam thiaj li nrov txog RAP Recycling hauv cov nroj tsuag Asphalt Kub Sib Xyaws
Tsav tsheb dhau txhua qhov chaw tsim kev niaj hnub no thiab koj yuav pom ib daim ntawv tshaj tawm uas khav txog "asphalt ntsuab." Tom qab cov lus hais yog kev hloov pauv ntsiag to: rap rov ua dua cov nroj tsuag asphalt kub uas hloov txoj kev taug kev nag hmo mus ua qhov chaw tsav tsheb niaj hnub no. Tab sis cov txheej txheem no puas txuag tau nyiaj tiag tiag, lossis nws tsuas yog kev lag luam zoo rau ib puag ncig xwb? Cia peb tev cov khaubncaws sab nraud povtseg - tsis muaj kev xav tsis thoob, tsis muaj kev muag khoom, tsuas yog cov lej thiab cov dab neeg xwb uas tseem ceeb.
Dab tsi suav tias yog RAP?
Cov Kev Siv Asphalt Rov Qab Los (RAP) tsis yog tsuas yog "cov khoom dub qub." Nws yog cov txheej txheem millings uas tseem muaj cov bitumen muaj nqis thiab cov khoom sib xyaw zoo. Thaum fractionated thiab kuaj xyuas kom zoo, RAP tuaj yeem hloov 15–40% ntawm cov ntaub ntawv tshiab hauv cov khoom sib xyaw kub tshiab. Hauv qee lub xeev, DOT specs tso cai rau cov feem pua siab dua yog tias qhov sib xyaw ua tau raws li cov qauv kev ua tau zoo. Kev txhais lus: cov neeg cog lus uas paub siv RAP tuaj yeem twv qis dua thaum tseem tau txais cov nyiaj tau zoo.
Yuav Ua Li Cas Cov Neeg Siv Khoom Rov Qab Ua Kom Kub Dua Yam Tsis Txhob Hlawv Cov Nyiaj Txiag
Cov kev txhawj xeeb ib txwm muaj txog RAP yog vim qhov kub dhau ntawm cov bitumen seem, ua rau laus ua ntej lub sijhawm. Lub nruas niaj hnub no uas muaj riam nkag nruab nrab thiab ob lub thoob rov qab ntws daws qhov no los ntawm kev ua kom cov pob zeb tshiab sov ua ntej, tom qab ntawd qhia RAP ntxiv mus rau hauv lub nruas. Vim tias cov pob zeb kub heev hloov lub zog mus rau RAP es tsis yog hluav taws qhib, cov bitumen tsis "ua noj." Qhov tshwm sim? Cov dej noo qhuav, tab sis cov khoom sib txuas ua rau nws cov elasticity. Zoo nkauj heev, puas yog?
Kev rhuav tshem ROI ntawm RAP
Xav txog ib lub Hoobkas 200-tph uas khiav 2,000 teev hauv ib xyoos. Thaum muaj 25% RAP cov ntsiab lus, koj hloov:
- 50 tph ntawm cov pob zeb tshiab muaj nqi ntawm $ 12 ton → $ 1.2 M txuag tau txhua xyoo
- 5% ntawm cov bitumen ntawm $ 550 tuj → lwm $ 1.1 M txuag tau
- Tsis tas them nqi pov tseg/thauj khoom → kwv yees li $200 txhiab
Muab lawv ntxiv rau hauv, koj yuav tau $2.5 M ib xyoos ua ntej them se. Txawm tias tom qab koj suav nrog cov ntxaij vab tshaus ua haujlwm RAP ntxiv, cov khoom ntsuas dej noo, thiab cov tshuaj tiv thaiv pa, lub sijhawm them rov qab feem ntau yog qis dua 18 lub hlis. Tsis muaj kev hloov pauv chump li cas los xij.
Cov Teeb Meem Zoo - thiab Yuav Ua Li Cas Dhia Lawv
Cov neeg tsis ntseeg hais tias cov khoom sib xyaw ua ke uas muaj RAP siab yuav tawg yooj yim dua. Qhov tseeb yog, kev tawg tshwm sim thaum cov nroj tsuag "ua kom nws tawg" yam tsis muaj kev sib npaug ntawm cov khoom siv rov ua dua tshiab. Qhov kho yog kev tshuaj xyuas cov khoom sib xyaw ua ke: rho tawm thiab qib cov khoom siv RAP, tom qab ntawd txiav txim siab seb puas yuav ua kom nws mos nrog cov khoom siv rov ua dua tshiab lossis hloov nrog cov khoom siv tshiab uas mos dua. Cov nroj tsuag uas ua raws li ASTM D8159 tus txheej txheem yeej ib txwm ua tiav cov qib PG thiab dhau Illinois Flexibility Index Test (I-FIT) qhov txwv. Hauv ntej, qhov zoo tsis yog kev twv txiaj yog tias koj ua koj txoj haujlwm tsev.
Dej noo: Tus Neeg Ua Phem Uas Ntshai
Txhua 1% ntawm cov dej noo uas tshuav nyob hauv RAP nyiag ~10 °C ntawm koj qhov kub sib tov. Qhov ntawd txhais tau tias koj hlawv roj ntau dua lossis muaj kev pheej hmoo ntawm cov pob qij txha mob. Txoj kev daws teeb meem? Kev kuaj xyuas cov dej noo peb theem :
- Khaws cov RAP rau ntawm daim asphalt pad uas muaj 2% qib rau kev ntws dej.
- Npog sab saum toj nrog geotextile uas ua pa tau—pheej yig tab sis txo qhov nqus dej nag ib nrab.
- Khiav cov sensors microwave inline ntawm txoj siv sia txias; cov nroj tsuag siv qhov kev hloov kho no tshaj tawm 0.8% cov dej noo kawg, qis txaus rau kev tsim khoom tsis muaj pa luam yeeb xiav.
Ntseeg kuv, cov ntsiab lus me me no cais cov kws tshaj lij thiab cov neeg xav ua.
Kev Cai Lij Choj: Qhov Twg Yog Nyiaj Dawb
Cov xeev xws li Texas, Missouri, thiab Georgia tam sim no muab cov nyiaj pab rau ib-ton rau cov khoom sib xyaw nrog ≥20% RAP. Qhov credit tuaj yeem yog $ 2– $ 5 ib-ton, nyob ntawm qhov tonnage thiab cov nyiaj ntxiv rau qhov ceev. Ntawm txoj haujlwm hauv xeev 50 000-ton, qhov ntawd yuav yog $ 250 k rov qab rau hauv koj lub hnab ris - tsis txhob kov cov khoom siv txuag uas peb tau xam ua ntej. Yog tias koj tsis twv hauv cov xeev ntawd, koj yuav xav saib xyuas; cov kev pab cuam nyiaj pab tau kis sai dua li cov lus xaiv thaum hnub them nyiaj.
Cov Lus Qhia Tseem Ceeb: Interstate 35 hauv Oklahoma
Thaum lub sijhawm kho dua tshiab xyoo 2022, tus neeg cog lus tau siv 35% RAP sib xyaw nrog cov khoom siv bio-based rejuvenator. Cov lus qhia tshwj xeeb xav tau tsawg kawg 8% cua voids ntawm 75 gyrations thiab tensile zog piv ≥80. Tsis yog tsuas yog sib xyaw dhau xwb, qhov project tau los hauv 12% hauv qab peev nyiaj thiab tau txais tus neeg cog lus ntxiv $ 180 k incentive. Cov cores coj ib xyoos tom qab tsis qhia pov thawj ntawm rutting lossis thermal cracking. Yog li ntawd, kev ua tau zoo hauv ntiaj teb tiag tiag txhawb nqa cov ntaub ntawv kuaj mob.
Kev Pov Thawj Yav Tom Ntej: Yuav Ua Li Cas Tom Ntej Rau Kev Siv Rov Qab RAP?
Cov chaw tsim khoom cog qoob loo tab tom sim cov khoom siv sib xyaw ua ke uas kub tsawg uas tso cai rau 50% RAP ntawm 275 °F es tsis yog 320 °F ib txwm muaj. Qhov kub qis dua txhais tau tias muaj kev oxidation tsawg dua, se carbon tsawg dua, thiab cov neeg nyob ze zoo siab dua uas tsis hu xov tooj rau cov lus tsis txaus siab txog pa taws. Lub caij no, cov cuab yeej ntsuas dej noo thiab kub uas tsav los ntawm AI tab tom txo qhov sib txawv; cov nroj tsuag tshaj tawm tias qhov sib txawv ntawm cov ntsiab lus ntawm cov khoom sib txuas poob qis los ntawm 0.4% mus rau 0.15%. Cov ntawv sau rau ntawm phab ntsa? Hauv tsib xyoos, 40% RAP yuav yog qhov qub tshiab, tsis yog qhov tshwj xeeb.
Daim Ntawv Teev Tseg Sai Sai Rau Kev Pib Tag Kis Sawv Ntxov
Yog tias koj khiav ib lub chaw sib tov kub thiab xav siv RAP rov ua dua tshiab, ntawm no yog cov pob khoom pib yooj yim:
- Thov kom muaj 3-bin txias pub retrofit kom cais RAP los ntawm qhov loj me.
- Nruab ib lub qhov nqus pa kom koj tus kws tshaj lij QC tuaj yeem ntes RAP txhua 500 tons.
- Ntiav ib lub tsev kawm ntawv qib siab hauv zos rau kev rho cov ntawv nplaum thiab kev ntsuas qib—tus nqi li ntawm $ 150 rau ib qho qauv tab sis txuag koj ntawm qhov ua tsis tiav.
- Sib tham txog tus nqi uas yuav tsum tau them ua ntej nrog tus neeg muag khoom rejuvenator; feem ntau cov neeg muag khoom yuav muab 5 000 gal thawj zaug yog tias koj kos npe rau daim ntawv cog lus muab khoom ib xyoos.
Ua plaub yam no thiab koj tuaj yeem ua tau zoo heev—tsis tas yuav muaj daim ntawv kawm tiav qib siab hauv kev tshawb fawb.
Cov Lus Qhia Tseem Ceeb
Puas yog cov chaw tsim cov asphalt kub uas siv rap rov ua dua tshiab yuav txo koj cov nqi khoom siv yam tsis ua rau cov khoom tsis zoo? Yeej yog lawm—yog tias koj siv RAP zoo li cov khoom siv raw, tsis yog pov tseg. Nqis peev rau kev faib ua feem, saib xyuas cov dej noo zoo li tus noog, thiab ua raws li kev tsim cov khoom sib xyaw raws li kev ua tau zoo. Qhov txiaj ntsig yog tam sim ntawd: cov nqi qis dua, cov ntaub ntawv pov thawj ntsuab dua, thiab cov nqi twv uas yeej cov neeg sib tw. Thiab hey, leej twg tsis nyiam qhov ntxiv xoom ntawm kab nyiaj tau los?
