Deploying high-precision machinery engineered for modified bitumen applications, paving operations, and heavy infrastructure projects worldwide.
In modern pavement engineering, straight-run virgin bitumen frequently fails to satisfy the demands of high-axle load transportation, extreme thermal fluctuations, and heavy shear stress. As a premier OEM Modified Bitumen Manufacturer & Supplier, our engineering framework integrates academic research with modern industrial manufacturing.
Bitumen modification relies on establishing an interpenetrating polymer network (IPN) or vulcanized rubber matrix within the base asphalt medium. By dispersing elastomeric polymers such as Styrene-Butadiene-Styrene (SBS), plastomeric materials like Atactic Polypropylene (APP), or chemically pre-treated Crumb Rubber (CRMB) at high shear rates, the fundamental rheological behavior of the binder undergoes a structural transformation.
Standard bitumen acts as a Newtonian fluid at high temperatures and a brittle solid at low temperatures. Polymer modification elevates the complex shear modulus ($G^*$) while reducing the phase angle ($\delta$), maximizing the rutting resistance factor ($G*/\sin\delta$) according to Superpave specifications.
By widening the thermal operational range, modified asphalt prevents thermal cracking at sub-zero temperatures (down to -30°C) while eliminating plastic deformation and rutting under extreme desert surface heats exceeding 70°C.
Incorporating precise chemical cross-linking agents stabilizes aromatic fractions within bitumen, substantially retarding short-term hardening during mixing and long-term aging driven by UV exposure and oxygen permeation.
| Property Parameter | Testing Standard | Penetration Grade 60/70 | SBS Modified Bitumen | Crumb Rubber (CRMB) |
|---|---|---|---|---|
| Softening Point (°C) | ASTM D36 / EN 1427 | 45 - 52 | 65 - 85 | 60 - 75 |
| Penetration at 25°C (0.1 mm) | ASTM D5 / EN 1426 | 60 - 70 | 40 - 60 | 30 - 50 |
| Elastic Recovery at 25°C (%) | ASTM D6084 / EN 13398 | < 15% | ≥ 85% | ≥ 70% |
| Force Ductility at 5°C (J/cm²) | EN 13589 | Negligible | > 2.5 | > 1.8 |
| Storage Stability (Diff. °C) | ASTM D5976 / EN 13399 | N/A | < 2.5 | < 3.0 (Stabilized) |
International Engineering, Procurement, and Construction (EPC) contractors, along with national road authorities, demand more than standard product delivery. Modern procurement frameworks prioritize total life-cycle cost reduction, consistent chemical homogenization, and environmental performance declarations (EPDs).
Though modified bitumen incurs a higher initial material outlay, its superior resistance to fatigue cracking extends pavement service life by 50% to 100%. Major procurement officers evaluate bitumen suppliers based on long-term structural integrity rather than initial unit costs.
With stringent Net-Zero targets in Western markets, our OEM modified bitumen facilities incorporate chemical surfactant warm-mix asphalt (WMA) additives. This reduces production temperatures by 20°C–30°C, lowering stack emissions and fuel usage without compromising structural bonding.
Cross-border compliance requires strict adherence to international standards including AASHTO M320, ASTM D5892, and European Standard EN 14023. Our testing regimes ensure every batch matches destination highway engineering specifications.
China's manufacturing ecosystem has evolved from high-volume output to automated precision engineering. Driven by advanced digital control systems and robust industrial infrastructure, our OEM manufacturing facilities deliver reliable processing and rapid worldwide distribution.
Equipped with multi-stage high-shear colloid mills operating above 3,600 RPM, our production units grind polymer particles down to sub-micron dimensions (<5 μm). This ensures total dispersion into the bitumen matrix and eliminates phase separation during long-distance thermal storage.
Fully integrated PLC and SCADA automation monitors feed rates, inline polymer dosing, dynamic thermal curves, and reaction times in real time. This micro-level process oversight guarantees batch-to-batch repeatability and eliminates manual operating errors.
Operating specialized heated tank container fleets, heated semi-trailers, and automated drum decanters, our logistics network handles bulk bitumen transportation efficiently across diverse international transit corridors.
Engineered formulations match localized environmental stressors, pavement loading profiles, and specialized construction requirements worldwide.
Formulated for heavy truck channelization and high axle loads. Eliminates rutting under heavy static loading at intersection approaches, toll plazas, and climbing lanes.
Handles high tire pressure, dynamic impact forces upon aircraft landing, and thermal shock from jet engine exhaust without binder stripping or surface shearing.
High-elasticity modified bitumen membranes provide continuous impermeability, safeguarding underlying concrete substructures and orthotropic steel decks from chloride ion ingress and deicing salts.
Custom SBS/CRMB blends resist micro-cracking during rapid thermal cycles in high-altitude zones while preventing binder bleeding under high solar radiation.
HEM Group was founded in 1998 by a distinguished panel of professors from Chang'an University alongside road building industry experts, initially operating as Xi'an Hongda Communications Technology Co., Ltd. We stand as one of China's earliest high-tech enterprises focusing on independent research and structural design of road construction and maintenance machinery.
Since inception, our strategic R&D efforts have produced scientific breakthroughs in mechanical dynamics, engine power matching, hydraulic transmission, and digital control systems. Recognizing our achievements, the Shaanxi Provincial Department of Science and Technology designated us a official "High-tech Enterprise" in 2006.
To serve international markets, we established our export brand, HME TOP Machinery Equipment Co., Ltd. in 2017. Today, our footprint covers equipment research, modified asphalt plant manufacturing, global logistics, and technical assistance across 60+ nations.
Addressing key procurement, technical, and operational questions for OEM modified bitumen and machinery sourcing.
Styrene-Butadiene-Styrene (SBS) remains the premier choice for elastic recovery. When processed at high shear rates with cross-linking reagents, SBS forms a continuous polymer network that delivers elastic recovery values exceeding 85%, preventing rutting and fatigue under severe loading.
Polymer degradation and separation during high-temperature transit are prevented through chemical stabilization (sulfur-based cross-linking) and high-shear colloid milling. This breaks polymer structures down to micro-particles (<5 microns), maintaining fluid homogeneity inside specialized thermal agitator tanks.
Yes. Our processing equipment and distributors feature programmable SCADA interfaces. Operators can adjust temperature curves, shear speeds, and additive ratios to match regional petroleum crude sources and precise technical specifications (AASHTO, ASTM, EN).
We operate international service centers and regional spare-parts hubs in Russia, Malaysia, South Africa, Uzbekistan, Ghana, Kenya, Indonesia, and Sri Lanka. We offer 24/7 remote technical support and on-site engineering personnel for deployment, training, and operational maintenance.
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