Jun 10, 2023
Amerika i gat bikpela RAP saplai sen long wol. Dispela atikol i glasim hau 'asphalt rejuvenation' i kamapim gutpela samting long maket bilong Amerika na hau ol saplaia bilong ol narapela kantri i ken kam insait.
Amerika i gat bikpela RAP saplai sen long wol. Federal Highway Administration (FHWA) i tok, Amerika i save kamapim samting olsem 60 milien tan bilong RAP long olgeta yia, na samting olsem 75% bilong en ol i save yusim gen. Dispela i mekim US i kamap nambawan kantri long wol we i save kamapim na baim RAP. Tasol, mak bilong yusim i gat rot yet long kamap gutpela moa — long planti stet, RAP konten i stap tasol long 20-30%, na 60%+ em i teknikel rot bilong winim. Ol bikpela samting we i pasim rot bilong skruim RAP konten em i no teknikel tasol em i institusenel na ekonomik: namba wan, ol teknikel standet i no wankain long olgeta stet, wantaim sampela stet i kisim ol hai-RAP konten i bihainim yet ol low-RAP konvensen; namba tu, ol RAP prais mekanisme i no gutpela olgeta — long sampela rijon, RAP saplai i winim lokal diman na prais i pundaun aninit long riplesmen veliu bilong en; namba tri, ol kontrakta i no laik kisim hevi — ol i no klia long wok bilong ol 'high-RAP content' na dispela i mekim ol kontrakta i laikim ol 'conservative' disain.
FHWA i bin pablisim 'Asphalt Rejuvenators for High-RAP Mixtures' gaid (FA HWA-NHI-16-011) long 2019, we i givim klia teknikel komplaens rot bilong hai-RAP risaikel. Ol bikpela rekomendesen em: namba wan, skelim bilong 'rejuvenator' i mas bihainim pefomens na i no long 'composition' — lukluk long 'post-rejuvenation' 'bitumen penetration', 'softening point', 'ductility', na 'post-RTFOT' pefomens; namba tu, rekomendim yusim bilong 'blending chart' rot bilong skelim 'blending effect' bilong fres na risaikel kolta; namba tri, rekomendim 'fatigue' na 'low-temperature' pefomens tes bilong ol 'recycled mixtures'; namba foa, strongim yusim bilong 'warm-mix' teknoloji long daunim 'mixing temperature' na ol 'emissions'. Long ol foren saplaia, FHWA gaid i salim wanpela klia toksave: maket akses bilong ol 'rejuvenator' i dipen long pefomens data, i no kantri we ol i kam long en. Ol i wokim dispela 'rejuvenator' bilong FangService wantaim ol samting we FHWA gaid i laikim — 25°C viskositi bilong 280 mPa·s, 'flash point' bilong 231°C, RTFOT viskositi resio bilong 1.1, na RTFOT mas senis bilong 0.9% — olgeta i bungim ol mak bilong FHWA gaid.
US RAP prais mekanisme i narakain long Yurop. Long Amerika, ol prais bilong RAP i save kamap long saplai na diman bilong ples na i no long riplesmen veliu. Long ol sentral na westen stet (olsem Texas, California), RAP saplai i planti na prais bilong en i ken go daun olsem $15-25 long wan wan tan — na fres agreget i ken kost olsem $40-60 long wan wan tan. Dispela prais difrens i min olsem yusim RAP i no sevim tasol ol kos bilong ol samting tasol tu i abrusim ol kos bilong 'virgin aggregate quarrying' na trenspot. Na tu, prais bilong kolta long Amerika i save stap olsem $500-700 long wan wan tan, na pe bilong senisim olpela kolta long RAP i stap aninit tru long dispela prais. Sapos yu yusim wanpela 'rejuvenator' long apim RAP konten long 30% i go long 60% dispela i save sevim samting olsem 30-40 kg bilong nupela 'bitumen' long wan wan tan bilong miks, na dispela i mekim yu sevim samting olsem $15-28 long wan wan tan long ol prais bilong nau. Long wanpela 100,000-ton projek, dispela tasol i sevim $1.5-2.8 milien long kos bilong kolta.
Insait long wanpela Texas I-35 haiwe rihabilitesen projek, Texas Dipatmen ov Trenspotesen (TxDOT) i adoptim wanpela hai-RAP rijeneresen solusen wantaim 60% RAP konten. Ol bikpela data: namba wan, RAP i kam long 'asphalt surfacing' we ol i bin putim 20 yia i go pinis, na ol i bin prosesim long 'grading system' bilong TxDOT; namba tu, 'rejuvenator dose' em 10% bilong 'bitumen mass' insait long RAP, na 'post-rejuvenation penetration' i kamap gut gen long 25 dmm i go long 50 dmm (virgin bitumen em 55 dmm); namba tri, temperaja bilong miksim i go daun long 175°C i go long 125°C, na i daunim fuel konsumsen long samting olsem 30%; namba foa, olgeta projek kos i bin stap olsem 32% daunbilo long konvensenel hot-miks solusen, wantaim kabon kredit reveniu bilong samting olsem $500,000. Bikpela samting bilong dispela keis em olsem em i soim olsem insait long institusenel fremwok bilong ol US federal haiwe, hai-RAP rijeneresen i no inap long kamap tasol long sait bilong teknikel tasol em i gutpela tu long sait bilong ekonomi — ol enjinia bilong TxDOT i tok olsem taim ol i tingim mani bilong kabon kredit na sevings bilong mentenens saikel ekstensen i go insait long projek fainens, komprehensif kos i winim 40% daunbilo long konvensenel rot.
Long ol foren asphalt rejuvenator saplaia we i laik go insait long maket bilong Amerika, ol rot bilong bihainim lo na wok bisnis i nidim gutpela plening. Namba wan, teknikel setifikesen — redim ol teknikel pepa na tes data bihainim ol samting AASHTO na FHWA i laikim, wantaim ol indipenden tes we ol US-akreditet leboretori i mekim (olsem AASHTO Materials Verification Laboratories). Namba tu, ol lokal ejensi — kamapim ol wok bung wantaim ol saplaia o distributa bilong kolta long Amerika long yusim ol kastoma netwok na ol wok bilong ol long sait bilong lojistik. Namba tri, pailot projek — wok bung wantaim wanpela stet DOT (olsem TxDOT o Caltrans) long pinisim wanpela pailot projek, na bungim ol data bilong enjiniaring na rekot bilong pefomens bilong ol lokal bilong Amerika. Namba foa, indastri asosiesen patisipesen — joinim Nesenel Asfalt Pevemen Asosiesen (NAPA) o ASTM Intanesenel long tekpat long indastri standet divelopmen na teknikel eksens. Bihain long dispela 4-pela step, ol foren saplaia i ken insait long pablik bid long maket bilong Amerika. Bikpela tingting em olsem maket bilong Amerika i gat 'teknoloji-driven' — sapos pefomens data i strong inap, ol foren prodak i ken resis wantaim ol lokol bren. I no olsem maket bilong Yurop, ol institusenel banis bilong ol non-lokal saplaia long maket bilong Amerika i liklik tru. View the Asphalt Rejuvenator Supplier
Tokim mipela long projek senario na ol samting yu nidim, na mipela bai painim stretpela solusen na givim yu wanpela kwot insait long 24 aua.
Kisim wanpela fri kwot3-in-1 'asphalt rejuvenator' (warm mix + modification + regeneration), RAP konten >=60% (maksimum 100%), 'mixing temperature' 120-140°C, 'fatigue life' >=85% nupela 'asphalt', 'comprehensive cost' 25-40% daunbilo. Viscosity 280 mPa·s, flash point 231°C, density 0.96 g/cm3, i stap insait long 25 kg o 1000 kg dram. Sapotim ol fomula we yu laikim na givim ol ripot bilong 'batch testing', wantaim ol 'trade terms' bilong EXW/FOB/CIF/DDP.
Lainim long makim ol ejen bilong stretim kolta na pe bilong en →