Pavement Crack Sealing Machine Technical Solution – Preventive Maintenance
After a highway is opened to traffic, pavement performance gradually deteriorates over time due to a combination of factors, including pavement structure, climatic conditions, terrain, geological characteristics, and traffic loading. Regardless of whether the pavement is flexible or semi-rigid, various types of cracking may develop for different reasons. Based on their causes and orientation, pavement cracks are generally classified into transverse cracks and longitudinal cracks.
Based on water infiltration test results, pavement cracks are classified into three levels by width:
Level I: less than 1 mm.
Level II: 1–3 mm.
Level III: 3–5 mm.
Cracks wider than 1 mm, especially Level II and Level III, allow water to penetrate the pavement structure and accelerate deterioration if not sealed in time.
During winter and spring, rainwater and snowmelt infiltration, combined with traffic loading, can lead to rapid crack expansion and structural damage.
Therefore, professional crack sealing equipment is required to prevent water intrusion and extend pavement service life.
Crack Sealing Machine Overview and Application
A crack sealing machine is a specialized pavement maintenance equipment designed to continuously heat and inject hot-applied rubberized sealant into pavement cracks, forming a durable and waterproof seal. It is a key component of modern pavement maintenance machinery.
Crack sealing machines are primarily used for preventive maintenance of pavement cracks. In field applications, they are typically operated as part of an integrated crack sealing system, together with a crack router and a hot air lance. This combination ensures proper crack preparation, effective moisture removal, and long-term sealing performance.
Crack Sealing Machine Configuration and Technical Specifications
The crack sealing machine is designed for preventive sealing maintenance of asphalt pavement cracks, suitable for highways, municipal roads, and large-scale pavement maintenance projects.
Six Core Performance Systems
1. Trailer Chassis System
The machine is built on a professional heavy-duty trailer chassis, featuring independent rubber torsion axle suspension for stable towing and on-site operation.
Technical features:
- Automatic overrun braking system combined with a parking brake for reliable and responsive braking
- Height-adjustable towing structure, compatible with different towing vehicle heights
2. Power System
Powered by a Honda GX630 gasoline engine, air-cooled with electric start.
Engine advantages:
- Vertical-shaft air-cooled design, suitable for various working environments
- Compact size with low noise output
- Optimized combustion efficiency
- Fuel consumption: approximately 6.2 L/h at full load
3. Electro-Hydraulic Control System
The control system integrates power management, thermal oil temperature control, sealant temperature control, electrically heated hose monitoring, material pump control, and air compressor operation.
System highlights:
- Integrated electrical circuit design
- User-friendly operation interface
- Easy maintenance and reliable field performance
4. Hydraulic System
The hydraulic system is powered directly by the engine and equipped with high-quality imported proportional control valves.
Key advantages:
- Modular hydraulic system design with flexible configuration
- Proven electro-proportional control technology for improved efficiency and reduced power consumption
- Stable flow output unaffected by load variations
5. Heating System
The heating system consists of a hot melt kettle and a diesel burner, ensuring uniform and efficient heating of sealant material.
Heating system features:
- Double-jacket hot melt kettle with thermal oil indirect heating
- High heat transfer efficiency without material deformation or carbonization
- Excellent thermal insulation with vertical stirring for uniform heating
- Equipped with a U.S. ACD 12V DC diesel burner with swirl combustion chamber, ensuring safe and reliable mobile operation
6. Pumping and Delivery System
The pumping system integrates sealant circulation, internal material pump, rotating delivery arm, electrically heated hose, electronic material control, and road brush.
System advantages:
- Built-in non-submerged material pump requiring no separate heating
- Easy maintenance and long service life
- 6-meter full-length electrically heated hose, resistant to bending and equipped with a waterproof outer jacket
- No hose flushing required after operation
Technical Specifications
| Item | Specification |
|---|---|
| Product Type | Trailer-Mounted Crack Sealing Machine |
| Sealant Tank Capacity | 200 L / 350 L |
| Machine Weight | Approx. 2000 kg |
| Overall Length | 4500 mm |
| Overall Width | 1700 mm |
| Overall Height | 2100 mm |
| Travel Mode | Trailer-mounted towing |
| Suspension | Axle suspension |
| Axle Configuration | Single axle |
| Number of Tires | 2 |
| Braking System | Integrated braking system with parking brake |
| Towing Height | Freely adjustable |
| Engine Brand | Honda |
| Engine Model | GX630 |
| Engine Power | 11–15 kW |
| Engine Fuel Tank | 50 L |
| Diesel Burner | U.S. ACD diesel burner |
| Burner Power | 28.2–103 kW |
| Burner Fuel Consumption | 6.6–20 L/h |
| Burner Fuel Tank | 50 L |
| Heating Method | Diesel heating |
| Kettle Structure | Double-jacket design |
| Heat Transfer | Indirect thermal oil heating |
| Agitation Method | Vertical bidirectional stirring |
| Hydraulic System | Imported electro-proportional control valves |
| Hydraulic Oil Tank | 50 L |
| Generator Power | 2 kW |
| Heated Hose Length | 6 m |
| Sealant Temperature | 110–190°C adjustable |
| Power Supply | 220 V |
| Electrical Control | Dual-channel integrated system |
| Display Type | Digital display |
| Thermal Oil Type | 320# |
| Thermal Oil Temperature | 110–250°C adjustable |
| Sealant Pump Flow | 0–24 L/min adjustable |
| Pump Type | Internal integrated design |