Precision-engineered road construction hardware built for ultra-durable polymer modified bitumen applications.
An Industry Whitepaper on Material Formulation, High-Shear Manufacturing Mechanics, and Advanced Road Engineering Performance
PMAE relies on the uniform dispersion of synthetic polymers—primarily Styrene-Butadiene-Styrene (SBS), Styrene-Butadiene Rubber (SBR), or Ethylene-Vinyl Acetate (EVA)—into an emulsified bitumen phase. Through high-shear colloid milling, polymer chains form a continuous 3D viscoelastic network within the residual binder after water evaporation.
Compared to unmodified asphalt emulsions, PMAE delivers superior Zero Shear Viscosity (ZSV) and reduced temperature susceptibility. It exhibits exceptional elastic recovery (>90% per ASTM D6084), drastically mitigating rutting under heavy axle loads and resisting thermal cracking during severe freeze-thaw cycles.
Developed in close collaboration with professors from Chang'an University—China's premier institution for highway engineering—HEM Group’s emulsification systems utilize dynamic temperature-controlled mixing chambers to prevent thermal degradation of polymer latex during processing.
Civil engineering contractors and municipal authorities require rigorous performance metrics when selecting surface treatment binders. The data below outlines key material indicators established across global specifications (ASTM D977, ASTM D2397, EN 13808):
| Performance Indicator | Standard Bitumen Emulsion (Rapid Setting) | Polymer Modified Emulsion (SBS Modified) | Engineering Benefit / Impact |
|---|---|---|---|
| Elastic Recovery @ 25°C (%) | < 20% | > 80 - 92% | Mitigates permanent pavement deformation & wheel tracking rutting. |
| Softening Point (°C) | 45°C - 52°C | > 65°C - 78°C | Prevents summer bleeding and aggregate loss in high-temp regions. |
| Fraass Breaking Point (°C) | -5°C to -10°C | < -18°C to -25°C | Resists low-temperature thermal cracking in freezing climates. |
| Cohesion Strength (J/cm²) | 0.5 - 0.8 | > 1.8 - 2.5 | Superior aggregate retention under high-speed heavy traffic forces. |
| Storage Stability (1-Day Demulsification) | < 1.0% | < 0.5% (with stabilizer) | Prevents phase separation during long-distance bulk transportation. |
HEM Group was founded in 1998 by a prestigious group of professors from Chang'an University and seasoned experts in the road building industry (originally registered as Xi'an Hongda Communications Technology Co., Ltd.). As one of China’s pioneer high-tech enterprises dedicated to independent R&D of road engineering machinery, HEM Group has shaped modern pavement preservation technology for over two decades.
Our core competencies span mechanical dynamics, engine power matching, hydraulic transmission systems, and digital electronic control technology. Recognized in 2006 as a "High-Tech Enterprise" by the Shaanxi Provincial Department of Science and Technology, we established HME TOP Machinery Equipment Co., Ltd. in 2017 to handle international export operations, OEM customization, and overseas technical support.
Today, HEM Group delivers a comprehensive one-stop portfolio: from high-shear bitumen emulsification plants, slurry seal pavers, chip sealers, and asphalt mixing plants, to heavy mining mobile crushers and excavators.
Why Tier-1 Global Contractors and State Infrastructure Agencies Partner with HEM Group
Direct technological transfer from Chang'an University's Key Laboratory of Road and Traffic Engineering allows us to continuously update our colloid mills, thermal oil heating units, and automated polymer feeding systems against real-world material stresses.
We configure turnkey polymer modified bitumen plants (capacities from 5 t/h to 40 t/h) tailored to client-specified polymer formulations, heating fuels (diesel, gas, thermal oil), and transport container dimensions.
Every component—from German-engineered mechanical seals in our high-shear mills to Siemens PLC automated control systems—undergoes 100% factory load testing prior to shipment to eliminate field downtime.
Extending Infrastructure Lifespan Through Sustainable Preventive Maintenance Technologies
Our polymer modified emulsified asphalt formulations combined with HEM intelligent slurry seal pavers provide rapid-setting (open to traffic within 1 hour) thin-overlay treatments. This seals hairline cracks, restores surface friction, and prevents water infiltration on high-speed expressways.
Utilizing high-elasticity polymer modified emulsions sprayed concurrently with aggregate chips via our Synchronized Chip Sealers creates dynamic stress-absorbing membrane layers (SAML). This effectively arrests reflective cracking between concrete substrates and asphalt overlays.
Ensuring strong shear bond strength between asphalt pavement lifts is critical to prevent delamination. Our modified cationic emulsions dry rapidly into a non-tack polymer film that will not pick up on truck tires during hot-mix paving operations.
In eco-conscious road rehabilitation, our customized polymer emulsions act as the primary binding agent when recycling 100% reclaimed asphalt pavement (RAP). This reduces carbon emissions by up to 60% compared to traditional hot-mix reconstruction.
Observe HEM Group's Road Maintenance Technologies Operating in Full Field Conditions
Exported to over 60 countries across Asia, Africa, South America, Oceania, and Eastern Europe.
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