Views: 0 Author: Site Editor Publish Time: 2026-09-07 Origin: Site
Traditional asphalt pothole repair mainly depends on cold‑patch material or hot‑mix asphalt transported from stationary batching plants. Cold‑patch material only delivers temporary repair with poor durability. Delivering hot‑mix from remote asphalt plants brings high logistic costs, temperature drop of HMA (hot‑mix asphalt), and strict working‑hour limits from mixing stations. The trailer‑mounted asphalt hot‑recycling mixer (mobile asphalt remixer / on‑site RAP reheating unit) enables on‑site collection, thermal rejuvenation and mixing of reclaimed asphalt pavement (RAP). Permanent pothole restoration can be accomplished on‑spot. This piece of road maintenance machinery has been widely adopted for municipal roads, provincial highways and expressway upkeep projects。
1. Equipment Overview
Model FND‑RZS1000 / 1500L is a drum‑type portable hot‑mix asphalt recycler built on a twin‑axle trailer chassis. Towing speed can reach up to 80 km/h, compatible with pickup trucks and light‑duty trucks without special transport vehicles. It adopts Siemens PLC touch‑screen intelligent control system. The mixing drum rotates at 360 degrees for uniform heating and agitation, fitted with double‑layer ceramic‑fiber thermal insulation to minimize heat loss.
This all‑in‑one unit integrates diesel‑fueled combustion heater, self‑contained generator set, emulsified asphalt spraying assembly, optional 100 L heated bitumen tank, remote‑controlled foldable LED lighting array, plus full‑set flash warning lamps and arrow‑shaped traffic indicators. It supports day‑time and night‑time pothole rehabilitation.
Item | FND-RZS1000L | FND-RZS1500L |
Drum Volume | 1000 L | 1500 L |
Batch Processing Capacity | 600-800 kg | 800-1000 kg |
Overall Dimension(L×W×H) | 4350×2116×2100 mm | 4600×2116×2100 mm |
Total Machine Weight | 2500 kg | 2800 kg |
Heating Burner | Riello 120 kW diesel burner | Riello 120 kW diesel burner |
First-batch Heating Duration | 15-20 min | 15-20 min |
Subsequent Batch Heating | 10-15 min | 10-15 min |
Discharge Method | Reverse-rotation spiral discharge, full unloading within 0.5-1 min | Reverse-rotation spiral discharge, full unloading within 0.5-1 min |
Power Supply | 6.5 kW generator set, 380 V output | 6.5 kW generator set, 380 V output |
Max Towing Travel Speed | ≤80 km/h | ≤80 km/h |
2. Working Principle of on‑site RAP reheating unit
Powerful diesel burner delivers thermal energy to the sealed 360° rotating mixing drum of this mobile asphalt remixer. Field‑crushed reclaimed asphalt pavement (RAP) chunks are fed into drum chamber for rotary heating and blending. Pre‑stored cold asphalt mixtures can also be re‑heated inside the drum.
The built‑in emulsified asphalt spray module serves two purposes: replenish bitumen binder for aged RAP material, or spray tack‑coat agent onto cavity walls of potholes to strengthen bonding interface between old pavement and fresh repair mixture. Self‑powered by onboard generator, the portable hot‑mix asphalt recycler works fully independent from grid electricity at remote road‑side work zones. It can also produce brand‑new hot‑mix asphalt from virgin aggregates and bitumen for small‑scale paving jobs
3. Step‑by‑Step Pothole Repair Construction Workflow
Step 1: Pothole Cavity Preparation
Target distressed zones including potholes, alligator cracking, manhole‑surround damages. Remove all loose, deteriorated asphalt material with pavement breaker or milling tools. Shape cavity into regular rectangular geometry, sweep away loose aggregate, dust and pooled water. Vertical side walls are required to create mechanical interlock for repair material, which largely defines long‑term patch service life
Image reference: cavity breaking & cleaning [Image5: Jackhammer clearing pothole cavity]
Important note: No standing water shall remain inside cavity; residual moisture causes delamination and cracking after repair.
Step 2: RAP Feeding & Thermal Regeneration
Load crushed old asphalt chunks directly into drum chamber of trailer‑mounted asphalt hot‑recycling mixer. Configure heating temperature and mixing rotating speed via PLC HMI panel. Drum rotates at low speed during heating cycle to avoid aggregate segregation. Double‑insulated drum ensures homogenous heat distribution and prevents local bitumen over‑aging.
The initial batch takes 15‑20 minutes for heating; follow‑up batches only consume 10‑15 minutes. Check mixture temperature until reaching construction‑compliant level.
Step 3: Tack‑Coat / Rejuvenator Application
Spray emulsified asphalt tack‑coat evenly across bottom and vertical walls of cleaned pothole cavity using machine‑mounted spray system. If reclaimed asphalt pavement shows insufficient bitumen content, dose emulsified rejuvenating binder straight inside mixing drum to restore bitumen film covering aggregate surface.
Step 4: Hot‑mix Discharging & Pothole
Switch drum to reverse rotation mode. Complete material discharging finishes within 0.5‑1 minute. Rejuvenated hot‑mix asphalt drops directly above repair cavity. Crew members spread and level mixture with rakes and shovels. Place material slightly higher than original pavement elevation to accommodate compaction settlement.
Step 5: Layer‑by‑Layer Compaction
Adopt walk‑behind roller or vibratory plate compactor according to cavity depth. For cavities deeper than 5 cm, implement multi‑lift paving and compaction. Compact from cavity edges towards center to achieve target density and prevent post‑construction settlement.
Image reference：roller compaction [Image8: Small roller compacting repaired patch]
Step 6: Site Inspection & Traffic Reopening
Wait for natural cooling of repaired patch. Re‑open public traffic when surface temperature drops to safe ambient level. Inspect flatness of finished repair patch, confirm no loose aggregate, cracking or depression. The full permanent pothole repair cycle is completed.
4. Advantages vs Conventional Repair Solutions
1. 100 % in‑situ RAP recycling: Demolished old asphalt chunks are thermally re‑processed into usable hot‑mix material on‑site. Greatly cuts virgin aggregate purchasing cost and waste‑hauling expenditure for carbon‑friendly maintenance.
2. Independent from stationary asphalt batching plants: Qualified hot‑mix asphalt can be manufactured even in night‑time or winter seasons when central mixing plants shut down, eliminating over‑reliance on low‑performance temporary cold‑patch repair.
3. Long‑life permanent restoration: Rejuvenated hot‑mix mixture delivers far better pavement performance than cold‑patch compound, extends patch service cycle and reduces repeated maintenance investment.
4. All‑in‑one trailer‑mounted system: Self‑contained power, illumination and warning lights. Single unit covers RAP collection, heating, mixing, tack‑coat spraying and discharging. Minimizes deployment of multiple separate machines on work‑site.
5. Critical Construction Precautions
1. Do NOT carry out hot‑recycling repair under rainy weather or with residual water inside pothole cavity.
2. Monitor drum heating temperature strictly to avoid thermal aging of asphalt binder.
3. Raise foldable LED light tower and activate warning flashers for night‑time operation, set‑up proper traffic‑control zones.
4. Flush emulsified asphalt pipelines with diesel solvent after finishing discharging, to prevent bitumen solidification and pipeline blockage.
