Direct-from-factory high-performance paving, milling, and chipsealing solutions designed for global infrastructure projects.
Technical analysis of synchronized asphalt binder spraying and aggregate spreading mechanics in modern highway preservation.
Combination chipsealing (Synchronous Chip Sealing) integrates the precise spraying of modified bitumen or asphalt emulsion with the immediate, simultaneous spreading of aggregate chips. By executing both actions within a split-second window (under 0.5 seconds), the binder maintains maximum thermal fluid dynamics, achieving optimal mechanical interlocking before surface tension breakdown.
Traditional pavement resurfacing incurs massive capital expenditure. Combination chipsealing functions as a high-performance preventive maintenance layer. It seals micro-cracks, stops water ingress, restores surface skid resistance, and extends asphalt pavement structural lifespan by 7 to 10 years at less than 30% of the cost of total pavement reconstruction.
As a specialized OEM manufacturer, HEM Group engineers heavy-duty combination chip sealers mounted on robust commercial chassis. Incorporating computerized feedback control loops, hydraulic pulse spraying nozzles, and modular aggregate hoppers, our machinery guarantees uniform application across varying vehicle speeds.
Technical Insight: The binding matrix between polymer-modified asphalt and stone chips requires exact viscosity control. Modern OEM combination chip sealers utilize hot-oil jacketed circulation loops to prevent nozzle clogging and guarantee spray uniformity within a strict ±1% tolerance margin.
How evolving environmental regulations and smart infrastructure investments are driving demand for combination chipseals globally.
Governments across Europe, North America, and Asia-Pacific are mandating reduced carbon footprints for municipal projects. Cold-applied polymer modified emulsions and warm-mix combination chip seal processes produce up to 45% fewer greenhouse gas emissions compared to traditional hot-mix asphalt (HMA) overlay construction.
The integration of radar speed sensors, CAN-bus automation, and thermal imaging cameras allows modern combination chip sealers to auto-adjust binder flow rates in real-time. If the truck decelerates near steep gradients, the electronic valve system dynamically scales spray volume to prevent bleeding.
Utilizing crumb rubber modifier (CRM) derived from recycled automotive tires inside combination chipseal binders is gaining rapid traction. CRM-modified chipseals provide superior elastic recovery, higher aggregate retention, and outstanding resistance to reflective cracking under extreme temperature fluctuations.
Leveraging advanced manufacturing clusters, academic R&D, and complete vertical integration.
HEM Group was established in 1998 by esteemed professors from Chang'an University—the premier institution for highway engineering and heavy machinery design in China. Our technological DNA combines theoretical mechanical dynamics with practical hydraulic transmission expertise.
Our modern production facilities utilize industrial laser cutting, robot-assisted welding cells, and precision CNC gear processing centers. By maintaining full in-house control over chassis modification, tank insulation, hydraulic piping, and software programming, we drive down procurement costs without sacrificing durability.
Through strategic industrial cluster localization in Shaanxi, China, key components—including international-grade hydraulic motors, proportional valves, and diesel burner units—are sourced with zero lead-time delays. OEM custom orders are engineered, built, and shipped within industry-leading lead times.
Tailored engineering configurations designed to satisfy global municipal contract requirements.
| Feature Parameter | Standard Modular Config | OEM Heavy-Duty Customization | Commercial Advantage |
|---|---|---|---|
| Asphalt Tank Capacity | 6,000 to 10,000 Liters | Up to 16,000 Liters (Custom Tank Material) | Fewer refilling cycles; higher daily area coverage (m²/day). |
| Aggregate Hopper | 8 m³ Heavy-duty steel hopper | 12 m³ Reinforced hopper with dual arch-breakers | Prevents aggregate bridging; optimizes stone dispersal speed. |
| Spray Bar Width | 3.8m to 4.5m Pneumatic fold | Up to 6.0m Hydraulic telescopic extension | Enables full single-pass lane coverage without lane-joint seams. |
| Metering Accuracy | ±1.5% Computer Controlled | ±0.8% Radar-Closed-Loop Servo Sync | Drastically cuts expensive asphalt binder material waste. |
| Burner & Heating | Automatic Diesel Burner (RIELLO) | Dual-burner thermal oil indirect heating system | Fast heat-up; prevents asphalt binder oxidation or overheating. |
Proven performance across diverse geographic topographies and extreme environmental conditions.
In mountainous regions prone to extreme freeze-thaw cycles, sub-surface water intrusion rapidly leads to pothole formation. Combination chipsealing creates a highly flexible, waterproof membrane layer that flexes with ground heave without cracking.
High ambient temperatures cause traditional bitumen to soften and bleed. Our specialized OEM combination chip sealers apply polymer-modified asphalt with precisely graded, high-polishing-resistant aggregate to maintain high friction skid resistance up to 70°C surface temps.
Heavy axle loads from mining trucks accelerate pavement rutting and fatigue. Double-layer combination chipsealing (Stress Absorbing Membrane Interlayer - SAMI) provides superior shear strength and load distribution for haul roads.
Pioneering independent R&D and high-end road engineering machinery since 1998.
HEM Group was founded by a group of professors from Chang'an University and experts in the road building industry in 1998, which was first called Xi'an Hongda Communications Technology Co., Ltd. It is the earliest high-tech enterprise that focuses on independent research and design of road construction equipment in China.
Since its inception, the company has adhered to high-tech R&D aiming to create an international brand for Chinese construction machinery. We focus on high-end road maintenance machinery, acquiring patents in mechanical dynamics, engine power matching, hydraulic transmission, and digital control technology. In 2006, we were officially recognized as a "High-Tech Enterprise" by the Shaanxi Provincial Department of Science and Technology.
In 2017, to strengthen international trade, the company established HME TOP Machinery Equipment Co., Ltd., responsible for technical exchange, import/export trade, after-sales service, and global technical support.
Pioneering R&D and manufacturing backplate, originating directly from academic engineering leadership.
Complete technical assistance on road construction technology, binder chemistry matching, and mix design.
Bespoke engineering for chassis compatibility, specialized spray widths, and dynamic hopper capacities.
Round-the-clock online assistance, video troubleshooting, and rapid dispatch of local technician teams.
Established teams in Russia, Malaysia, South Africa, Uzbekistan, Ghana, Kenya, Indonesia, and Sri Lanka.
Exporting to over 60 countries including Australia, Fiji, Bolivia, India, Nigeria, Mozambique, and Congo.
In-depth technical answers for procurement directors, highway engineers, and fleet managers.
A standard bitumen distributor only sprays liquid binder, requiring a separate chip spreader vehicle to follow behind. A Synchronized Combination Chip Sealer combines both asphalt spraying and chip spreading onto a single chassis. The chips are dropped into the binder fractions of a second after spraying, maximizing aggregate adhesion before binder cooling and emulsion breaking occur.
Our equipment incorporates an advanced CAN-bus electronic control unit linked to a non-contact radar speed sensor. As the truck accelerates or decelerates, the system dynamically calculates required volumetric output and adjusts hydraulic proportional motor speeds, maintaining a precise binder application rate within ±1% accuracy.
Yes. Our heavy-duty OEM models can be customized with high-shear asphalt pumps, widened nozzle orifices, and heat-jacketed circulation pipelines specifically engineered to process high-viscosity rubberized asphalt and SBS polymer-modified binders without clogging.
We provide complete OEM engineering integration for major global commercial truck chassis including HOWO, SHACMAN, Dongfeng, ISUZU, MAN, Mercedes-Benz, and Volvo. Customers can supply their local chassis, or we can export fully integrated complete vehicle assemblies.
Our proprietary stainless steel spray nozzles feature anti-wear hardened treatments with an operational lifespan exceeding 1,500 hours under standard emulsion conditions. Automatic pneumatic blow-down cleaning systems flush residual asphalt from the spray bar after every work shift to minimize manual maintenance.
All HEM Group machines come with a 12-month or 2,000-hour comprehensive warranty. We maintain local spare parts stock hubs and overseas service centers in key markets (Russia, South Africa, SEA) and provide remote AR diagnostic support with 24-hour response turnaround.
Complementary machinery for total road construction, recycling, and rehabilitation projects.
HME Machinery