Ɔberɛfɛw da 20, afe 2025
Efi RAP nwomakorabea a wɔbɛsi so akɔsi adwini ne gyedie afrafra so no, saa asɛm yi ma ɔkwan a mfasoɔ wɔ so a ɛbɛma reclaimed-asphalt content akɔ soro afiri 30% akosi 60%+.
Anamɔn a edi kan a wɔde kyerɛ RAP mu nsɛm no nyɛ mix design — ɛyɛ RAP nhomakorabea. RAP nyɛ ade a ɛyɛ pɛ — RAP a efi akwan afã horow, milling bun ahorow, ne adansi bere ahorow mu no gu ahorow kɛse wɔ bitumen dodow, aggregate grading, ne onyin dodow mu. RAP a wɔde bedi dwuma a wɔmfa nkyerɛwde nhyɛ mu no ne sɛ wɔde adwenem naayɛ bɛba afrafra nhyehyɛe no mu. RAP nhomakorabea a wɔbɛkyekye no hwehwɛ sɛ wɔyɛ anammɔn abiɛsa. Nea edi kan no, nhwɛsode: fa nhwɛsode ananmusifo wɔ bere ne bere mu fi ɔfã biara a wɔde twitwiw nneɛma mu, na kata ɔkwan no ntrɛwmu nyinaa so. Nea ɛtɔ so mmienu, abasobɔdeɛ: kyekyɛ RAP mu dodoɔ ahodoɔ a egyina bitumen a ɛwɔ mu (e.g., 4-5%, 5-6%, 6-7%) ne aggregate grading range, sie na kyerɛw grade biara wɔ ɔkwan soronko so. Nea ɛto so abiɛsa, fael: yɛ sɔhwɛ ahorow a edi mũ wɔ grade biara ho — bitumen a ɛwɔ mu (ignition kwan), aggregate grading (sieve analysis), bitumen adwumayɛ (rotational viscosity, penetration, softening point), ne aggregate adwumayɛ (crush value, Los Angeles abrasion, nsu a ɛtwetwe). Sɛ wɔde RAP nhomakorabea no si hɔ wie a, mix design wɔ data fapem a wotumi de ho to so sen sɛ wɔde wɔn ho bɛto akontaabu a wɔde wɔn ho ahyɛ mu so.
Sɛ wɔde RAP nhomakorabea no si hɔ wie a, mix design phase no fi ase. Ɔkwan a wɔfa so yɛ no te sɛ asphalt mix nhyehyɛe a wɔtaa yɛ no, nanso nsonsonoe atitiriw abiɛsa na ɛwɔ mu. Nea edi kan no, ‘afrafra’ a wɔde bitumen a ɛyɛ foforo ne nea wɔasan de adi dwuma — afrafra ne adeyɛ kwan bi wɔ bitumen a akyɛ a ɛwɔ RAP mu ne rejuvenator foforo a wɔde aka ho no ntam, na wontumi mmu bitumen a ɛwɔ mu nyinaa denam RAP bitumen a ɛwɔ mu ne bitumen a ɛyɛ foforo a wɔde bɛka ho ara kwa no so. Nea ɛtɔ so mmienu, rejuvenator dosage — wɔtaa de rejuvenator no ka ho wɔ ɔha mu nkyekyɛmu pɔtee bi mu wɔ bitumen dodoɔ a ɛwɔ RAP no mu (e.g., 5-15%), a kyɛfa pɔtee no gyina RAP bitumen no onyin dodoɔ ne botaeɛ adwumayɛ so. Nea ɛtɔ so mmiɛnsa, grading design — wɔabubu aggregate dedaw a ɛwɔ RAP mu no na wɔayɛ no abɔdeɛ mu compacted, na ne grading su no yɛ soronko wɔ aggregate a wɔatu no foforɔ ho; mpɛn pii no RAP aggregate no yɛ fɛ sen biara (higher flakiness index), enti ɛsɛ sɛ wɔyɛ nsakrae wɔ coarse-to-fine ratio a ɛwɔ aggregate foforo mu no mu sɛnea ɛfata. Nsusuiɛ a ɛsen ne: botaeɛ afrafra nhyehyɛɛ (laboratory Marshall anaa Superpave Gyratory) → nneɛma a wɔyɛ afrafra ho adansedie (afifide nhwɛsoɔ) → sɔhwɛ afrafra a wɔdi ho adanseɛ (paving section sampling).
Bere a RAP mu nneɛma kɔ soro no, afrafrade no stiffness (indirect tensile strength, dynamic modulus) taa kɔ soro — eyi ye efisɛ stiffness a ɛkorɔn kyerɛ sɛ pavement no deforms kakraa bi wɔ adesoa ase na rutting risk no sua. Nanso, stiffness a ɛkɔ soro dodo nso de ɔhaw ahorow ba: nea edi kan no, asiane a ɛkɔ soro wɔ ɔhyew a ɛba fam mu mpaapaemu — afrafra a ɛyɛ den kɛse ma ɔhyew mu nhyɛso kɛse ba bere a ɔhyew no kɔ fam no, na sɛ tensile ahoɔden ntumi nkɔ so a, transverse mpaapaemu bɛda adi nea ɛto so abien, ɔbrɛ nkwa betumi atew — wɔ adesoa a wɔde hyɛ mu mpɛn pii ase no, nneɛma a ɛyɛ den kɛse no nni tumi a ɛtwetwe adwennwen a enye. Enti, RAP content specification ntumi nhwɛ rutting adwumayɛ nkutoo; ɛsɛ sɛ wɔhwɛ ɔhyew a ɛba fam a ɛpaapae ne ɔbrɛ adwumayɛ bere koro mu. Engineering kwan no ne sɛ: hyehyɛ stiffness ceiling (e.g., dynamic modulus a ɛyɛ 10,000-15,000 MPa @ 20°C, 10 Hz), na yɛ nsakrae wɔ rejuvenator formulation ne bitumen foforo a ɛwɔ mu no mu ma afrafrade no stiffness no akɔ so ayɛ den wɔ botae no mu. Nsɛm a wɔsusuu kyerɛ sɛ 60% RAP afrafra a wɔde rejuvenator a ɛfiri FangService di dwuma no wɔ dynamic modulus a ɛwɔ 30% RAP afrafra a wɔtaa de di dwuma no mu, berɛ a ɔbrɛ nkwa nna tu mpɔn bɛboro 15%.
Sɛ RAP dodow boro 40% a, afrafra adwumayɛ so tew kɛse, na ɛda adi wɔ akwan abiɛsa so. Nea edi kan no, afrafra a ɛko tia a ɛkɔ soro — bitumen a akyɛ no wɔ viscosity kɛse, na RAP asinasin nya ahoɔden kɛse wɔ afrafra sanku no mu, na ɛnyɛ den sɛ ɛde afrafra a ɛnteɛ ba. Nea ɛto so abien, paving a ɛyɛ den — high-viscosity afrafrade sen yiye wɔ paving afiri hopper na kyekyɛ yiye fa screw conveyor, ebetumi ama segregation aba paving soro. Nea ɛto so abiɛsa, compaction difficulty — afrafrade no hwere compactability wɔ ɔhyew a ɛba fam, hwehwɛ sɛ rollers di akyi yiye na wɔde passes pii di dwuma. Engineering countermeasures ne: nea edi kan no, fa warm-mix rejuvenator di dwuma de tew viscosity nyinaa so (rejuvenator a efi FangService no ma mixing temperature ba fam kodu 120-140°C, na ɛma adwumayɛ tu mpɔn kɛse); nea ɛto so abien, optimize RAP preheating — preheat RAP to 60-80°C ansa na woafrafra na ama ɔhyew nsonsonoe no so atew ne aggregate foforo; nea ɛto so abiɛsa, siesie compaction nhyehyɛe — fa high-frequency, low-amplitude vibration compaction di dwuma ma efficiency tu mpɔn bere a ɛtew aggregate breakdown so.
Nneɛma a wɔde gye tom ma afrafrade a RAP kɛse wom no ntumi nsuasua nea wɔde afrafra a wɔtaa de di dwuma no ara kwa na ɛsɛ sɛ egyina mfiridwuma a wɔsan de di dwuma no su so yɛ nsakrae. Nea edi kan no, Marshall gyinabea ne nsu a ɛsen — pintinn kyerɛ adesoa-soa tumi na nsu a ɛsen kyerɛ deformation tumi. Mpɛn pii no, afrafrade a ɛwɔ RAP a ɛkorɔn no tumi gyina pintinn kɛse nanso ebia ɛwɔ nsu a ɛsen a ɛba fam (nneɛma a ɛyɛ den), enti ɛsɛ sɛ gye a wogye tom no twe adwene si sɛnea ɛgyina pintinn ne nsu a ɛsen no nsusuwii so sen sɛ wɔde bɛtwe adwene asi sɛnkyerɛnne abien no mu biara nkutoo so. Nea ɛto so abien, mframa a ɛda hɔ — nhyehyɛe mframa a ɛda fam no taa yɛ 4-6%, na ɛsɛ sɛ afuw mu mframa a ɛda hɔ ma afrafra a ɛwɔ RAP a ɛkorɔn no yɛ ±1.5% wɔ nhyehyɛe no mu. Nea ɛto so abiɛsa, VMA (voids in mineral aggregate) — VMA taa ba fam ma afrafra a RAP kɛse wom efisɛ aggregate dedaw no gye ahunmu no fã dedaw. Nea ɛto so anan, ɔbrɛ adwumayɛ — wɔ afã horow a wɔtɔn wɔn kɛse no, ɛsɛ sɛ ɔbrɛ nkwa a ennu adesoa kyinhyia 1,000,000 ho hia. Nea ɛto so anum, ɔhyew a ɛba fam adwumayɛ — ɛsɛ sɛ wɔyɛ ɔhyew a ɛba fam bending sɔhwɛ anaa BBR sɔhwɛ de hwɛ hu sɛ afrafrade no tensile strain wɔ -10°C no nsua nsen 2,000 με.
Ansa na wobɛkyerɛ RAP mu nsɛm ne rejuvenator a wobɛtɔ no, supplier qualification audit ho hia. Ɛsɛ sɛ wosi nneɛma asia so dua. Nea edi kan, rejuvenator type — so ɛyɛ awo ntoatoaso a edi kan dilution-oil type anaasɛ awo ntoatoaso a ɛto so abien molecule regeneration type? Nea etwa to no korɔn koraa wɔ bere tenten adwumayɛ mu. Nea ɛto so abien, mfiridwuma ho nsɛm krataa — bisa honam fam ne nnuru parameters a edi mũ: viscosity, flash point, density, fractions (saturate / aromatic / resin / asphaltene content), ne post-RTFOT onyin adwumayɛ. Rejuvenator a ofi FangService tintim saa nsɛnkyerɛnneɛ yi nyinaa, na ne nyinaa wɔ nnwuma-a ɛdi kan. Nea ɛtɔ so mmiɛnsa, regeneration effectiveness validation data — bisa engineering case data a wode saa rejuvenator yi di dwuma, a laboratory rejuvenated bitumen penetration, softening point, ductility recovery data, ne field mixture performance data ka ho. Nea ɛtɔ so nnan, nhyiamu — si nhyiamu a ɛda rejuvenator ne bitumen a wɔde dii dwuma wɔ adwuma no mu (e.g., SBS modified bitumen, rubberized bitumen) so dua. Nea ɛtɔ so anum, nneɛma a wɔde ma no gyina pintinn — si so dua sɛ nea ɔde nneɛma ma no tumi yɛ nneɛma ne nneɛma a wɔde asie no dodow na ama wɔahwɛ ahu sɛ wɔde ma a wontwaa mu wɔ adwuma no mu. Nea ɛtɔ so nsia, mfiridwuma mmoa — si so dua sɛ ebia nea ɔde nneɛma ma no betumi de mfiridwuma ho mmoa a ɛwɔ beae hɔ ne mmoa a wɔde afrafra nhyehyɛe ama. Sɛ nneɛma asia yi mu biara nyɛ nea abotɔyam wom a, ɛsɛ sɛ wɔsesa nea ɔde ma no.
Wɔ mfiridwuma ho nsɛm a ɛfa mfiridwuma ho apam no mu no, ɛsɛ sɛ wɔkyerɛw nsɛm a ɛfa RAP a wɔsan de di dwuma ho no pefee na wɔakwati akasakasa a ɛbɛba akyiri yi. Nea edi kan no, RAP mu nsɛm — kyerɛ RAP mu nsɛm a wɔde asi wɔn ani so (e.g., 60%) ne nsakrae a wɔma ho kwan (e.g., ±5%). Nea ɛto so abien, rejuvenator brand ne model — kyerɛ ade pɔtee no na amma contractor no rentumi mfa nsi ananmu. Nea ɛto so abiɛsa, ɔhyew a wɔde frafra — kyerɛ ɔhyew-afrafra a wɔsan de di dwuma afrafra hyew (120-140°C) ne compaction hyew (100-120°C). Nea ɛtɔ so nnan, gye a wɔgye tom — twe adwene si sɔhwɛ akwan pɔtee so na wɔtwa mu gyinapɛn (e.g., mframa a ɛda hɔ 4-6%, dynamic modulus ≥10,000 MPa). Nea ɛtɔ so anum, nsakraeɛ nsɛm — sɛ ɛhia sɛ wɔyɛ nsakraeɛ wɔ RAP mu nsɛm mu ɛnam nneɛma mu nsakraeɛ nti a, ɛsɛ sɛ wɔkyerɛkyerɛ nsakraeɛ nhyehyɛeɛ ne boɔ nsakraeɛ kwan no mu pefee. Bere a wɔakyerɛw saa nsɛm anum yi pefee no, wɔakyerɛkyerɛ asɛyɛde a ɛda adwumayɛfo ne owura ntam no mu yiye.
Ka wo project scenario ne ahwehwɛdeɛ kyerɛ yɛn, na yɛbɛma ano aduru a ɛfata no ahyia na yɛde quote ama wɔ nnɔnhwereɛ 24 ntam.
Nya Quote a Wɔde Ma Kwa3-wɔ-1 asphalt rejuvenator (ɔhyew afrafra + nsakrae + regeneration), RAP content >=60% (maximum 100%), afrafra ɔhyew 120-140°C, ɔbrɛ nkwa >=85% foforo asphalt, ne nyinaa ka 25-40% a ɛba fam. Viscosity 280 mPa·s, flash point 231°C, density 0.96 g/cm3, ɛwɔ 25 kg anaa 1000 kg sankuo mu. Boa customized formulas on demand na fa batch testing amanneɛbɔ ma, a optional aguadi nsɛm a ɛyɛ EXW/FOB/CIF/DDP.
Sua asphalt regeneration agent a wɔpaw ne nsɛm a wɔafa aka ho ade →