Explore our top-tier manufacturing line including slurry seal pavers, cold in-place recyclers, road wideners, and heavy earthmoving solutions.
As global infrastructure networks mature, the paradigm of highway engineering has shifted decisively from aggressive capital expansion to Life-Cycle Pavement Preservation (LCPP). Slurry seal pavers and micro-surfacing machines represent the apex of preventive maintenance technology—restoring friction, sealing micro-cracks, waterproofing sub-bases, and extending structural pavement life by up to 7 to 10 years at a fraction of traditional overlay costs.
Rooted in academic excellence and pioneered by highway engineering professors from Chang'an University in 1998, HEM Group (originally Xi'an Hongda Communications Technology Co., Ltd.) has evolved into China’s authoritative R&D hub for slurry sealing, bitumen distribution, and continuous pavement surfacing equipment.
Understanding material dynamics, chemical break mechanisms, and continuous volumetric proportioning systems.
Modern slurry seal pavers rely on synchronization between aggregate feed belts, bitumen emulsion positive-displacement pumps, water metering units, and chemical additive injection. HEM's micro-computer control system ensures precise dosing tolerances within ±0.5%, adjusting dynamically to paving speed.
Micro-surfacing utilizes quick-set, polymer-modified asphalt emulsion (CQS-1h / LMCQS-1h) combined with select crushed aggregates, mineral fillers (Portland cement/hydrated lime), and water. Chemical additives control breaking times, enabling traffic opening within 1 hour of application.
The core mixing chamber features dual-shaft synchronized counter-rotating paddles lined with high-wear resistant chromium alloy plates. This configuration delivers thorough homogeneous mixing of thick slurry within 3 to 5 seconds before discharge into the spreader box.
| Gradation Type | Application Focus | Aggregate Size Range | Residual Asphalt Content (%) | Paving Thickness (mm) |
|---|---|---|---|---|
| ISSA Type I | Crack sealing, low-traffic residential roads, airport taxiway sealing | 0 - 2.36 mm | 10.0% - 16.0% | 2.0 - 3.0 mm |
| ISSA Type II | Urban arterials, wear courses, oxidation prevention, light rutting | 0 - 4.75 mm | 7.5% - 13.5% | 4.0 - 6.0 mm |
| ISSA Type III | High-speed expressways, heavy traffic corridors, deep rut filling, skid resistance | 0 - 9.5 mm | 5.5% - 9.5% | 6.0 - 10.0 mm |
Key technological shifts driving global procurement and pavement engineering standards.
Global net-zero mandates are pushing contractors away from traditional Hot Mix Asphalt (HMA) thin overlays toward cold-mix slurry seals. Cold micro-surfacing reduces carbon emissions by up to 45% per square meter by eliminating aggregate heating requirement.
Next-generation slurry machines integrate GPS/GNSS velocity tracking, radar material level sensors, and cloud diagnostics. Real-time material ratio logging ensures compliance with strict DOT and international highway authority quality control parameters.
While truck-mounted slurry machines remain cost-effective for medium municipal jobs, continuous self-propelled pavers are dominating high-speed highway contracts where joint-free continuous paving eliminates transverse cold joints.
A strategic framework for fleet managers, municipal procurement officers, and paving contractors.
Procurement teams must evaluate the responsiveness of the machine's closed-loop hydraulic metering systems. Fluctuations in aggregate moisture or binder viscosity must be compensated automatically by CAN-bus controller logic to avoid flushing or binder stripping.
Slurry seal pavers carry dense loads of aggregate, emulsion, water, and cement. Ensure the chosen manufacturer configures chassis mounting with optimal axle weight distribution complying with local bridge laws and transport regulations (EU, Tier 4 / Stage V chassis compatibility).
High-abrasion components—pugmill paddles, mixer liners, and slurry spreader box squeegees—must be crafted from hardened HARDOX or high-chrome iron alloys. Evaluating spare parts lifecycle costs and global warehouse availability is vital for operational uptime.
Restores macro-texture and skid resistance on high-volume corridors. Micro-surfacing type III formulations resist heavy axle loading and prevent hydroplaning, delivering a rapid 1-hour return to service.
Friction loss and Foreign Object Debris (FOD) risk are critical aviation concerns. Slurry sealing locks surface aggregate securely while waterproofing airfield subgrades without altering runway elevation profiles.
Provides a smooth, quiet, aesthetic jet-black finish. Type I and II slurry seals seal raveling surfaces, block UV oxidation, and prevent water ingress at a third of asphalt mill-and-fill costs.
Founded in 1998 by esteemed professors from Chang'an University (formerly Xi'an Hongda Communications Technology Co., Ltd.), HEM Group pioneered independent research and design of high-end road construction machinery in China.
In 2006, our technological breakthroughs earned recognition as a "High-Tech Enterprise" by the Shaanxi Provincial Department of Science and Technology. To streamline international distribution, technical exchange, and global field service, HME TOP Machinery Equipment Co., Ltd. was established as our dedicated export sales headquarters in 2017.
Today, our product ecosystem spans road building machinery (milling machines, asphalt distributors, pavers, chip sealers, slurry seal pavers, road wideners), aggregate crushing plants, and heavy earthmoving excavators.
Direct academic engineering lineage from Chang'an University highway research labs, offering unmatched expertise in mechanical dynamics and fluid hydraulics.
We don't just sell machinery—our chemical engineers provide job-mix design assistance, aggregate grading analysis, and emulsion formulation support.
Flexible modular engineering allowing customization of hopper capacities, chassis mounts, auxiliary engine brands (Cummins, Deutz, Perkins), and spreader box widths.
Dedicated sales, parts depots, and field service engineer teams stationed across Russia, Malaysia, South Africa, Uzbekistan, Ghana, Kenya, Indonesia, and Sri Lanka.
Watch our road maintenance machinery and slurry paving equipment in real-world infrastructure projects. HEM Group equipment engineered for maximum uptime, simplified maintenance, and harsh climatic conditions.
Exporting high-quality construction machinery to over 60 countries across Asia, Africa, Europe, and the Americas.
Full suite of wheel loaders, excavators, backhoe loaders, motor graders, and specialized walking excavators engineered for civil engineering, bridge construction, port expansion, and agricultural revitalization projects worldwide.
Leading range of asphalt mixing plants, bitumen distributors, synchronous chip sealers, slurry seal pavers, cold in-place recyclers, road wideners, and pavement marking machinery.
Heavy-duty mobile jaw crushers, mobile primary vibrating screens, and roller crushers tailored for tough quarry crushing, recycling operations, and mining aggregate grading.
How HEM Group is shaping the next decade of intelligent road maintenance technology.
Integrating 3D LiDAR surface scanners directly into spreader boxes to dynamically adjust squeegee height, automatically correcting rutting profile variances on the fly.
Deploying electro-hydraulic auxiliary drive systems for slurry pumps and mixing pugmills, lowering fuel consumption by 30% and reducing noise emissions during urban nighttime paving.
Real-time infrared temperature sensors and humidity feedback loops connected to onboard AI logic, adjusting chemical additive feed rates instantaneously to maintain optimal setting times across micro-climate changes.
Expert answers regarding slurry seal paver operation, material compatibility, and fleet procurement.
While both machines utilize volumetric continuous mixing of aggregate, emulsion, water, and additives, micro-surfacing machines feature higher torque dual-shaft pugmills and advanced metering systems capable of handling polymer-modified quick-set emulsions (CQS-1h). Micro-surfacing can be applied in thicker layers (ISSA Type III for rut filling) and cures chemically, allowing traffic reopening within 1 hour, whereas standard slurry sealing cures via thermal evaporation.
HEM Group slurry seal pavers can be mounted on a variety of multi-axle heavy truck chassis (such as SINOTRUK, SHACMAN, Volvo, MAN, or Mercedes-Benz) meeting local emissions standards (Euro V/VI, EPA Tier 4 Final). Auxiliary engines driving the hydraulic pumps can be specified with Cummins, Deutz, or Perkins diesel powerplants.
Our machines employ a synchronized CAN-bus closed-loop control system. Electromagnetic flowmeters track emulsion and water rates, while digital encoders monitor aggregate conveyor belt speed. If any flow rate deviates from the set job-mix formula, the system automatically adjusts hydraulic displacement valves in real-time.
HME TOP Machinery provides on-site dispatch of senior field engineers for assembly, calibration, job-mix trial paving, and crew training. Additionally, remote telemetry diagnostics allow our engineering center in China to troubleshoot electronic control parameters globally 24/7.
Slurry seal pavers are purpose-built continuous mixing machines. However, HEM Group manufactures specialized Synchronous Chip Sealers (where bitumen emulsion and aggregate chips are sprayed concurrently in a single pass). We advise selecting dedicated units based on contract specifications or procuring multi-functional equipment options.
High-reliability machinery engineered to support every phase of road rehabilitation and construction.
Partner with HEM Group & HME TOP Machinery to elevate your pavement maintenance projects. Our engineering team is ready to assist with customized slurry paver configurations and global logistics.
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