Dɛn Ne Asphalt Rejuvenator ne Nea Enti a RAP Recycling Ho Hia

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Ɔberɛfɛw da 20, afe 2025

Asphalt pavement a wɔasan ayɛ no ka nneɛma a wotumi san de di dwuma kɛse sen biara a wɔyɛ wɔ akwan siesie mu no ho. Asphalt rejuvenator ne nea ɛma high-RAP mixes yɛ adwuma - nea enti ne sɛnea wɔyɛ no ni.

Reclaimed Asphalt Pavement (RAP): Nneɛma a Wɔsan De Di Dwuma a Ɛsen Biara wɔ Ɔkwan a Wɔsiesie mu

Asphalt pavement a wɔasan agye, anaa RAP, ne nneɛma a wɔde akwan dedaw a wɔyam na wobubu gu so na ɛyɛ. Bitumen binder a akyɛ ne aggregate dedaw na ɛwom. Wɔ akwan so siesie ne ne siesie mu no, RAP yɛ nneɛma a wɔsan de di dwuma kɛse sen biara a wɔyɛ no mu biako: adwuma biako a wɔde twitwiw nneɛma wɔ ɔkwan a ɛkɔ ntɛmntɛm a ɛwɔ mfinimfini so no betumi ayɛ tɔn mpempem pii. Sɛ wɔtow saa nneɛma yi nyinaa gu a, anka ɛbɛsɛe asase na asɛe bitumen binder ne aggregate a ɛyɛ papa tɔn mpempem pii a egye asase ho bere ansa na ayɛ. Mfaso titiriw a ɛwɔ RAP a wɔde di dwuma bio so no yɛ mmerɛw: dannan nneɛma a wɔde adi dwuma dedaw pɛnkoro no san kɔ nneɛma a wɔde yɛ ɔkwan foforo so.

RAP Ɛnyɛ ‘Ɔbo Dedaw’: Nneɛma Abien, Mfe Baako Pɛ

Adwene a ɛnteɛ a wɔtaa nya ne sɛ RAP yɛ ‘ɔkwan dedaw碎石’ ara kwa. Ɛnyɛ saa. RAP wɔ nneɛma abien: aggregate dedaw (ɔbo a wɔabubu, anhwea, ne nea wɔde ahyɛ mu) ne bitumen binder a akyɛ. Aggregate no titiriw nsakra esiane onyin nti — wɔde bere asɔ n’ahoɔden, ne grade, ne ahotew ahwɛ na ɛtaa gyina hɔ pintinn sen nneɛma a wɔatu foforo. Ɔhaw no ne bitumen no. Bere a bitumen de mfe pii asom no, ɛnam nsu a ɛyɛ hyew ne oxidation so hwere ne fã a emu yɛ hare (ngo) no, na ne colloidal nhyehyɛe no dan fi sol-gel so kɔ gel so. Bitumen no yɛ den, ɛyɛ mmerɛw, na ɛhwere tumi a etumi kyekyɛ nhyɛso ahorow no. Eyi nti na RAP hia rejuvenation — ɛnyɛ aggregate dedaw no na ehia ayaresa, ɛyɛ bitumen a abɔ akora no.

Bitumen a Anyinyin Ho Nnuruyɛ: Oxidation, Volatilization, ne Colloidal Imbalance

Bitumen a ɛbɔ akwakoraa ne aberewa yɛ nnuru a ɛma ɛyɛ den, ɛnyɛ nipadua mu den ara kwa. Bere a wɔreyɛ bitumen no, wɔkɔ so de mframa pa, UV mframa, ne ɔhyew a ɛkɔ soro di dwuma, na wɔsakra nnuru ahorow abiɛsa. Nea edi kan no, oxidation: hydrocarbons a enni ma wɔ bitumen no mu ne oxygen yɛ adwuma ma ɛyɛ carbonyl ne hydroxyl akuw, na ɛma molecule mu duru ne polarity yɛ kɛse. Nea ɛto so abien, nsu a ɛyɛ hyew: hydrocarbon a emu duru sua ne nea ɛyɛ huam guan nkakrankakra wɔ ɔhyew a ɛkɔ soro mu, na ɛma nneɛma nketenkete a emu yɛ duru (asphaltenes) dodow kɔ soro. Nea ɛto so abiɛsa, colloidal a ɛnkari pɛ: mfiase no bitumen yɛ colloidal apete a wɔde asphaltene ntini no sɛn maltenes (resins ne ngo) aduru bi mu; bere a ngo so tew na resins no yɛ nwini no, asphaltene a wɔaboaboa ano no nyin na nhyehyɛe no dan fi sol so kɔ gel so, na ɛhwere tumi a ɛsa ne ho yare ne nea ɛko tia mpaapaemu wɔ ɔhyew a ɛba fam mu. Saa nsakrae abiɛsa yi bom ma nea ɛkɔ mu no so tew, nea ɛyɛ mmerɛw no kɔ soro, na nea ɛyɛ mmerɛw no hwe ase — ne tiawa mu no, bitumen no yɛ den na ɛyɛ mmerɛw.

Nea Enti a Wontumi mfa RAP nni dwuma Sɛnea Ɛte: Bottlenecks Abiɛsa wɔ Inclusion Rates a Ɛkorɔn

Sɛ wɔde RAP ka asphalt afrafra a wɔayɛ no foforo ho tẽẽ a wɔanyɛ ho adwuma biara a, nkotoku abiɛsa bɛda adi. Nea edi kan no, stiffness mismatch: bitumen a ayɛ dedaw no betumi anya mmerɛwyɛ 20°C anaa nea ɛboro saa a ɛboro bitumen a wɔayɛ no foforo de so, na wɔ ɔhyew a wɔde frafra mu no eyi betumi ama bitumen a abɔ akora no akuwakuw a ɛnpete a ɛyɛ adwuma sɛ mpaapaemu mfiase wɔ adesoa ase. Nea ɛto so abien, adwumayɛ a ɛyera: bitumen a ayɛ dedaw no mu nsu a ɛyɛ den no korɔn koraa sen bitumen a wɔayɛ no foforo, na ɛma ahoɔden a ɛko tia no yɛ kɛse bere a wɔrefrafra na wɔrebɔ kwan no na ɛde mpaapaemu ne compaction a enni hɔ ba. Nea ɛto so abiɛsa, sɛnea ɛtra hɔ kyɛ asiane:未经再生的老化沥青在界面处与新沥青仅形成物理粘结,而非化学融合。在水和荷载的反复作用下,界面会逐渐劣化,导致早期疲劳开裂和水损坏。这三个瓶颈直接限制了RAP 的掺量——不加再生剂时,大多数工程只能将 RAP 掺量控制在 20-30% 之间。

Sɛnea Rejuvenator Yɛ Adwuma: Fa Hann Fractions Nnua Na Paapae Oxidative Cross-Links mu

Asphalt rejuvenator yɛ ade bi a wɔde ka ho a wɔayɛ no pɔtee sɛ ɛbɛma bitumen a ayɛ dedaw no asan ayɛ adwuma. N’adwinnade no wɔ afã abien. Nea edi kan no, hann afã horow a wɔsan hyɛ mu ma: hydrocarbons a ɛyɛ huam ne nea ɛyɛ ma a ɛsan de wɔn ho hyɛ bitumen a abɔ akora no colloidal nhyehyɛe no mu, na ɛma ngo ne asphaltenes kari pɛ na ɛdan bitumen no fi gel so san kɔ sol-gel so wɔ rejuvenator no mu. Nea ɛto so abien, oxidative cross-links a wɔpaapae mu: bitumen a abɔ akora no kura molecule akɛse oxidative cross-linked structures (condensed aromatics a carbonyl ne hydroxyl akuw wom); nneɛma a ɛyɛ nnam a ɛwɔ rejuvenator no mu no tow hyɛ saa cross-link bonds yi so, na ɛpaapae mu yɛ no molecule asinasin nketenkete na ɛtew bitumen no molecule mu duru ne polarity nyinaa so. Sɛ wɔka nneɛma abien yi bom a, ɛma bitumen a ayɛ dedaw no hyɛn mu, ɛyɛ mmerɛw, na ɛyɛ mmerɛw no ba gyinapɛn ahorow a ɛbɛn bitumen a wɔayɛ no foforo de no so.

3-in-1 Nhyehyɛe no: Ɔhyew-Afrafra + Nsakrae + Mmabun, Ade Baako

Asphalt rejuvenator a FangService boa no de 3-in-1 design di dwuma: ɛyɛ adwuma bere koro mu sɛ ɔhyew-frafra ade, adwumayɛ sesa, ne nnuru rejuvenator. Sɛ́ ade a wɔde fra ɔhyew mu no, ɛtew ɔhyew a wɔde fra asphalt afrafra mu ne nea wɔde hyɛ mu no so fi atetesɛm mu 170-190°C kosi 120-140°C — ɛtew bɛyɛ 30-50°C — a ɛtew pɛtro a wɔde di dwuma ne mframa a wɔtow gu no so tẽẽ. Sɛ́ nsakraefo no, ɛyɛ afã abiɛsa cross-linked network wɔ bitumen a wɔayɛ no foforo no mu, na ɛma elastic ahoɔden ne ɔbrɛ nkwa tu mpɔn — ɔbrɛ nkwa a wɔasusuw no du bɛboro 85% wɔ ɔbaabun asphalt de no mu. Sɛ́ nea ɛma obi yɛ foforo no, ɛyɛ hann-fraction replenishment ne oxidative cross-link cleavage a yɛaka ho asɛm wɔ atifi hɔ no. Sɛ wowɔ dwumadie mmiɛnsa no nyinaa wɔ adeɛ baako mu a, ɛkyerɛ sɛ ɛnhia sɛ adwumayɛfoɔ no tɔ na ɔde nneɛma mmiɛnsa a ɛsono emu biara ka ho, na ɛma afrafra nhyehyɛeɛ ne beaeɛ no sohwɛ yɛ mmerɛ.

RAP a Ɛkɔ Anim a Wɔde Ka Ho: Sikasɛm ne Nneɛma a Atwa Yɛn Ho Ahyia Asɛm no ma 60% ne nea ɛboro saa

Sɛ wɔde rejuvenator no di dwuma a, wobetumi ama RAP dodow akɔ soro afi 20-30% a wɔtaa yɛ no so akodu bɛboro 60%, na sɔhwɛ ahorow ada no adi sɛ RAP bɛyɛ 100% — a ɛkyerɛ sɛ bitumen foforo anaasɛ aggregate a wɔatu foforo biara nni hɔ koraa. Sikasɛm ho asɛm no yɛ nea ɛwɔ afã horow pii. Nea edi kan no, bitumen a wɔkora so: sɛ wɔde bitumen a ɛyɛ foforo 60% kakraa bi di dwuma wɔ afrafra tɔn biara mu a, ɛma wokora yuan ɔhaha pii wɔ tɔn biara mu wɔ mprempren bo ahorow mu. Nea ɛto so abien, sika a wɔde asie a wɔaka abom: wɔsan de nneɛma a wɔaboaboa ano dedaw a ɛwɔ RAP mu no di dwuma tẽẽ, na eyi ɛka a wɔbɔ wɔ abo a wɔaboaboa ano a wɔmfa nyɛ hwee a wotu, de kɔ baabi foforo, na wɔbubu no nyinaa fi hɔ. Nea ɛto so abiɛsa, ahoɔden a wɔkora so: sɛ wɔde frafra a ɛyɛ hyew a, ɛtew pɛtro a wɔde di dwuma so bɛyɛ 30%. Nea ɛtɔ so nnan, carbon a wɔtew so: ahoɔden a wɔde di dwuma a ɛba fam a wɔde nneɛma a wɔkora so ka ho no tew carbon a wɔtow gu no nyinaa so bɛboro 30% sɛ wɔde toto ɔhyew a wɔde frafra a wɔtaa de di dwuma ho a. Ɛka a wɔbɔ nyinaa no sua 25-40% sen sɛnea wɔtaa de fra ɔhyew a ɛyɛ hyew. Eyinom nyɛ nsusuwii mu nsusuwii — ɛyɛ akontaabu a ɛyɛ katee a egyina adwuma no ho nsɛm ankasa so.

Nea Enti a Enti: Carbon Anohyeto, Nneɛma Bo a Wɔaka abom, ne Nneɛma a Wɔde Ma Ho Nhyehyɛe Foforo

Akwan so adwuma no wɔ nsakrae kɛse bi mu. Nneɛma abiɛsa a ɛrekɔ so reba abɛma ayɛ mmerante ne mmabaa a wɔde RAP kɛse ayɛ no nyɛ nneɛma a atwa yɛn ho ahyia ho ɔkwan kɛkɛ na mmom ɛbɛyɛ sikasɛm mu ahiade. Nea edi kan no, carbon anohyeto: nniso ahorow a ɛwɔ wiase nyinaa de carbon a wɔtow gu ho gyinapɛn ne aguadi nhyehyɛe ahorow a wɔde besisi akwan reba, na ahoɔden a wɔde di dwuma kɛse ne mframa a wɔtow gu wɔ ɔhyew a wɔde frafra a wɔtaa de di dwuma mu no rebɛyɛ ɛka a wɔbɔ de di mmara so. Nea ɛto so abien, nneɛma bo a ɛkɔ soro: anohyeto ahorow a ɛfa abo a wotu ho ne nneɛma a atwa yɛn ho ahyia ho ahwehwɛde ahorow ama abofra a wɔbom yɛ a ɛyɛ papa bo akɔ soro, bere a nkabom dedaw a ɛwɔ RAP mu no nni nkɛntɛnso biara. Nea ɛto so abiɛsa, nhyehyɛe foforo a wɔde ma wɔ nneɛma a wɔde ma mu: wiase nyinaa bitumen ne aggregate a wɔde ma no akɔ so ayɛ basaa fi bere a ɔyaredɔm no bae, na ɛtaa bo kɔ soro, bere a RAP yɛ ade a ɛwɔ mpɔtam hɔ a ɛwɔ nneɛma a wɔde ma a ɛyɛ den na wotumi hyɛ ho nkɔm. Wɔ saa tebea yi mu no, tumi a wobetumi anya 60%+ RAP nkabom no nyɛ ade a ɛyɛ dɛ bio — ɛyɛ nsonsonoe a ɛda adwuma a mfaso wɔ so ne nea ɛhwere ntam.