Explore our flagship pavement maintenance solutions, specialized bitumen transport units, and heavy-duty road paving systems designed for maximum precision and operational longevity.
Modern highway infrastructure engineering is undergoing a fundamental structural shift. Municipalities, transport departments, and private concessionaires globally are moving away from traditional reactive pavement rehabilitation toward proactive preventive maintenance technologies. Among these, **Chipseal Road Surface Treatment (Chip Sealing)** has emerged as the most economically viable, carbon-efficient, and structurally sound preventative seal for asphalt and granular road networks worldwide.
By applying a precisely metered layer of polymer-modified asphalt emulsion followed immediately by an evenly distributed aggregate layer, Chipseal creates a waterproof, skid-resistant wearing course. This technology seals micro-cracks, prevents moisture intrusion into base layers, and restores surface friction—extending pavement service life by 7 to 10 years at a fraction of the Cost per Lane Mile (CPLM) associated with Hot Mix Asphalt (HMA) resurfacing.
Independent studies by transportation agencies validate that incorporating synchronized chip sealers into routine lifecycle management yields massive economic and environmental returns. Below is an engineering comparison matrix analyzing Chipseal against competing resurfacing methods over a 20-year highway maintenance lifecycle:
| Pavement Treatment Type | Initial CAPEX ($/m²) | Expected Life (Years) | Embodied Carbon (kg CO₂e/m²) | Waterproofing Efficacy | Skid Resistance (BPN) |
|---|---|---|---|---|---|
| Synchronized Chipseal (HEM System) | $2.50 – $4.20 | 7 – 10 Years | 1.8 kg | Superior (100% Sealed) | 75 – 85 (High Macrotexture) |
| Thin HMA Overlay (40mm) | $12.00 – $18.00 | 10 – 12 Years | 14.5 kg | Moderate | 60 – 70 |
| Slurry Seal / Micro-surfacing | $3.80 – $6.50 | 5 – 7 Years | 3.2 kg | High | 65 – 75 |
| Crack Seal + Fog Seal | $1.20 – $2.00 | 2 – 3 Years | 0.8 kg | Low - Temporary | 45 – 55 |
HEM Group (originally founded as Xi'an Hongda Communications Technology Co., Ltd. in 1998) was forged from the academic excellence of world-renowned pavement engineering researchers at **Chang'an University**—China's premier institution for highway construction and heavy machinery engineering.
Over two decades of rigorous mechanical dynamics research, hydraulic transmission modeling, and digital electronic control engineering have established HEM Group as the authoritative pioneer in pavement machinery manufacture. Recognized as a official **"High-Tech Enterprise" by Shaanxi Provincial Department of Science and Technology in 2006**, our technology holds dozens of invention patents spanning automated binder metering, heat-balance spray bars, and synchronicity kinematics.
In 2017, to serve international municipal and contractor demands, HEM Group established **HME TOP Machinery Equipment Co., Ltd.** as its direct international sales and technical support arm, delivering end-to-end global supply chain services, custom OEM solutions, and lifecycle field support.
A flawless chip seal coat requires flawless synchronization. If the binder cools even by 10°C prior to aggregate placement, or if the aggregate embedment depth falls outside the optimal 50–70% range, premature aggregate loss (shelling) or binder flushing occurs. HEM Group’s **Synchronized Chip Sealers** eliminate these field failure modes through computer-controlled pneumatic zero-delay technology.
Our patented rear-mounted spray bar and aggregate gate coupling ensures the bitumen emulsion spray cone is followed by aggregate within **0.2 seconds** (less than 100mm of vehicle displacement). This guarantees aggregate contact while bitumen retains maximum interfacial surface energy and wetting viscosity.
Equipped with Doppler radar speed sensors and dynamic proportional valve manifolds, the system automatically regulates asphalt pump RPM and gate aperture width. Whether accelerating up gradients or decelerating on curves, the preset application rate (L/m² and kg/m²) remains strictly constant within a ±1% tolerance margin.
Precision CNC-machined brass and stainless steel nozzles feature customized fan angles (60° or 80°) with automatic pneumatic triple-overlap spray patterning. This completely eliminates transverse streaking or "zebra stripe" non-uniformity across working widths up to 4.2 meters.
| System Parameter | HEM Synchronized Chip Sealer Series | HEM Intelligent Bitumen Distributor | Industry Standard Requirements |
|---|---|---|---|
| Bitumen Tank Capacity | 6,000L – 14,000L (Heat-Insulated Rockwool) | 4,000L – 18,000L | Varies by chassis (4x2, 6x4, 8x4) |
| Aggregate Hopper Capacity | 8 m³ – 14 m³ (Hydraulic Tipping) | N/A (Towed / Separate Spreader) | 6 m³ – 12 m³ |
| Spraying Width | 200 mm to 4,200 mm (Pneumatic Segment Control) | 200 mm to 6,000 mm | Max 4,000 mm |
| Asphalt Spray Precision | ±1.0 % (Radar Closed-Loop Feedback) | ±1.0 % | ±3.0 % to ±5.0 % |
| Bitumen Heating Method | Dual Diesel Burners + Thermal Oil Circulation | Automated Diesel Burner System | Direct Flame (High Burn Risk) |
| Applicable Media | Hot Bitumen, Emulsified Bitumen, Rubberized Bitumen | All Standard & Polymer Modified Binders | Standard Emulsions only |
Achieving structural reliability in chipseal construction requires matching equipment calibration with exact aggregate and binder physical parameters. HEM Group equipment is fully compliant with **ASTM D2397**, **AASHTO T59**, and European standard **EN 12271** for sprayed surface treatments.
The choice of binder dictates initial chip retention and long-term elasticity. Our integrated thermal management system maintains exact operational temperatures:
Aggregate shape and cleanliness are non-negotiable variables for successful chipseal execution:
Operating machinery across diverse climatic zones—from equatorial rainforests to high-altitude sub-zero plateaus—demands tailored engineering modifications. HEM Group customized machinery operates across over 60 countries.
Regions: Southeast Asia (Indonesia, Malaysia), West Africa (Ghana, Nigeria), Coastal South America.
Engineering Adaptations: Corrosion-resistant marine-grade electrical wiring harness, tropical radiator cooling packages rated for 52°C ambient temperatures, and fast-breaking emulsion anti-foaming spray nozzles.
Regions: Middle East, Central Asia (Uzbekistan), Northern Africa, Inland Australia.
Engineering Adaptations: Heavy-duty dust filtration systems, ceramic thermal insulation surrounding binder tanks, and UV-resistant hydraulic hose armoring to withstand severe solar degradation.
Regions: Russia, Eastern Europe, High-Altitude Andes, Central Asian mountain corridors.
Engineering Adaptations: Pre-heating thermal jackets for asphalt pumps, low-temperature synthetic hydraulic fluids, sub-zero cold start auxiliary battery systems, and high-altitude engine turbocharging.
To eliminate international operational downtime, HEM Group operates dedicated regional service engineering hubs, inventory depots, and technical consultation centers. We manage all export documentation, international sea/rail logistics, and local customs compliance.
Our localized engineering teams provide rapid-response field dispatch, equipment commissioning, operator certification, and OEM spare part supply across key focus regions:
HEM Group’s R&D division is continuously pioneering intelligent highway construction machinery. Our next-generation engineering roadmap integrates Artificial Intelligence, Edge Computing, and Sustainable Powertrains to elevate pavement seal quality while reducing labor costs.
Real-time 3D laser scanning monitors existing pavement macro-texture depth prior to spraying, automatically calculating optimal bitumen application rates on a meter-by-meter basis to prevent over-inking or dry spots.
Cloud-connected machine networks transmit live material consumption metrics, asphalt tank temperatures, site GPS coordinates, and yield rates directly to project managers' mobile dashboards.
Transitioning auxiliary hydraulic pumps and heating systems to lithium-ion electric power packs, cutting jobsite diesel emissions by up to 35% during idle and heating phases.
Beyond Chip Sealers and Bitumen Distributors, HEM Group supplies a complete ecosystem of road rehabilitation, earthmoving, and mining equipment. Each product line undergoes stringent factory quality control and performance testing.
Watch our machinery operating in field environments globally. Our equipment is built with reinforced structural steel, world-class hydraulic pumps (Sauer-Danfoss / Rexroth), and reliable diesel engines (Cummins / Weichai / Perkins).
Full suite of heavy earth-moving equipment including wheel loaders, heavy excavators, backhoe loaders, motor graders, and specialty walking excavators ("Iron Spider-Man") for emergency rescue and steep terrain work.
Asphalt mixing plants, asphalt pavers, road milling machines, asphalt paver feeders, road rollers, micro-surfacing machines, slip-form concrete pavers, and road wideners.
Mobile primary screening units, mobile jaw crushers, mobile roller crushers, and compact crushing plants optimized for quarrying and recycled asphalt pavement (RAP) processing.
We work alongside global contractors, municipal infrastructure departments, and machinery dealers across 60+ countries.
Technical guidance and decision-support answers curated by our senior pavement machinery R&D engineering team.
Explore our complete inventory of specialized environmental, slip-form paving, crushing, and compact excavating machinery direct from our manufacturing facility.
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