Explore our wholesale line of geotechnical, asphalt, and non-destructive pavement testing machinery certified to ISO & ASTM standards.
An in-depth analysis of non-destructive structural pavement evaluation, dynamic loading mechanics, and global infrastructure asset management standardizations.
The Falling Weight Deflectometer (FWD) simulates the dynamic impulse transient loading caused by heavy vehicle wheel loads on flexible and rigid pavements. Governed by standards such as ASTM D4694 (Standard Test Method for Deflections with a Falling-Weight-Type Impulse Load Device) and AASHTO T256, FWD data forms the empirical backbone of Mechanistic-Empirical Pavement Design Guidelines (MEPDG).
Traditional destructive coring only yields localized physical samples. Conversely, wholesale Falling Weight Deflection testing equipment drops a calibrated mass from a specific height onto a padded load plate. This generates a dynamic half-sine transient load pulse ranging between 20 ms and 30 ms in duration, transferring a force peak from 7 kN up to 250 kN directly into the surface layer.
An array of ultra-precise seismic velocity transducers (geophones) or force force-balance accelerometers positioned radially outward (e.g., at 0, 200, 300, 450, 600, 900, 1200, 1500, and 1800 mm) records the transient vertical deflection of the pavement surface. The resulting continuous profile—known as the Deflection Basin—enables geotechnical engineers to backcalculate the dynamic elastic modulus ($E$) of each individual structural layer: asphalt surface, granular base, subbase, and natural subgrade soil.
| Parameter Parameter | Highway & Urban FWD (Standard) | Heavy Duty Airport FWD (HWD) | Portable Micro-FWD (PFWD) |
|---|---|---|---|
| Target Applications | Highways, Arterial Roads, Parking Structures | Airport Runways, Taxiways, Industrial Ports | Subgrade Trenching, Earthworks, Soil Quality |
| Pulse Load Range | 7 kN to 120 kN (Adjustable Mass) | 30 kN to 250 kN (Heavy Weight Drops) | 1 kN to 15 kN (Handheld / Tow-behind) |
| Deflection Sensors | 7 to 9 High-Precision Geophones | 9 to 11 Multi-Axis Seismic Sensors | 1 to 3 Integrated Displacement Sensors |
| Data Acquisition Speed | < 60 seconds per test point | < 45 seconds per drop sequence | Instantaneous LCD / Bluetooth transfer |
| Software Interface | Real-Time Backcalculation (MODULUS/ELMOD) | FAA-Compliant COMFAA & PCN System | Mobile App / Cloud Sync Software |
| Standards Compliance | ASTM D4694, AASHTO T256, EN 12697-27 | ICAO Annex 14, FAA AC 150/5370-11E | ASTM E2835, DIN 18134 |
Driven by 15+ years of engineering mastery, state-of-the-art CNC machining, and academic research collaborations.
With more than 15 years of civil engineering background, located in the modern High Technology Industry Development Zone of Xi'an—an ancient historical capital of China—Xi'an Zealchon spans a state-of-the-art 7,500 square meters building area.
We engineer, manufacture, and supply qualitative arrays of laboratory research and field testing instruments across civil engineering, geological surveying, water conservancy, hydropower, highways, high-speed railways, and commercial airports. Beyond our core civil testing line, Zealchon maintains an advanced laser R&D department focused on semiconductor photonics.
Under the direct guidance and joint R&D cooperation of distinguished professors from Chang'an University Highway College, Air Force Engineering University, Xi'an Petroleum University, and Xi'an University of Technology, we have developed groundbreaking testing series. Our proprietary trademark, "Xiya", was officially recognized as a prestigious trademark of Shaanxi Province, filling critical technological gaps both domestically and internationally while securing national, ministerial, and provincial technology awards.
Equipped with high-precision vertical machining centers, heavy CNC lathes, milling machines, surface grinders, hydraulic shearing, bending machines, and argon arc welding systems.
Founded by research leaders from Chang'an University Highway College and regional polytechnic universities, staying at the cutting edge of global civil engineering developments.
We execute strict quality guarantees on all manufactured equipment, operating with craftsmanship integrity, full standard calibration, and responsive after-sales service.
Deploying robust Falling Weight Deflection test systems across critical transportation networks and industrial civil works.
International airports utilize Heavy Evaluation Weight Deflectometers (HWD) delivering up to 250 kN shock loads to compute ACN-PCN (Aircraft Classification Number - Pavement Classification Number) ratings under extreme Boeing/Airbus wheel configurations.
Highway authorities and municipal engineers implement trailer-mounted FWD testing at high operational speeds to map overlay thickness requirements, identify void formation beneath concrete slabs, and prevent premature asphalt fatigue.
Ballastless and ballasted rail foundations demand exact resilient modulus values ($E_r$) to maintain strict millimeter-level track tolerances. Portable and trailer FWD units verify dynamic subgrade stiffness before rail laying.
Modern FWD manufacturing relies on integrated AI algorithms (such as genetic algorithms and automated neural networks) to backcalculate layer moduli in seconds, eliminating manual iteration in multi-layered pavement structures.
Global procurement teams favor FWD platforms featuring integrated DGPS mapping, IR surface temperature sensors, and real-time cloud data sync to streamline large-scale asset inventory projects.
Next-generation FWD rigs are frequently paired with Ground Penetrating Radar (GPR) and continuous 3D Laser Profilers for simultaneous measurement of structural capacity, internal layer thickness, and surface roughness (IRI).
Additional specialized civil engineering testing apparatus from our OEM/ODM manufacturing facility in Xi'an.
Expert answers regarding Falling Weight Deflection testing standards, equipment calibration, dynamic loading, and OEM bulk procurement.
Falling Weight Deflectometer (FWD) testing is completely non-destructive (NDT). It simulates actual moving wheel dynamic loads without compromising the structural integrity of the pavement. Coring only provides static, localized material specimens, whereas FWD tests continuously measure the full deflection basin across kilometers of road or runway within hours. This allows engineers to calculate dynamic layer moduli ($E$), structural numbers ($SN$), and remaining service life rapidly and cost-effectively.
Our FWD manufacturing and calibration procedures strictly adhere to ASTM D4694 (Standard Test Method for Deflections with a Falling-Weight-Type Impulse Load Device), ASTM D4695 (Standard Guide for General Pavement Deflection Measurements), AASHTO T256, and European EN 12697-27 guidelines. For airfield applications, systems conform to FAA AC 150/5370-11E standards.
Every unit undergoes dual calibration: Absolute Calibration against reference load cells certified by national metrological institutes, and Relative Calibration using multi-sensor tower rigs compliant with AASHTO R32. Seismic geophones are calibrated to achieve a precision within ±1 micron, ensuring reproducible dynamic deflection measurement across extreme temperature ranges.
China's localized industrial clusters in Xi'an combine advanced heavy CNC metalworking, complete domestic supply chains for high-speed sensors, and direct integration with leading transportation university laboratories (such as Chang'an University). This results in high manufacturing precision, custom modular engineering, significantly shorter production lead times, and competitive wholesale pricing without sacrificing build quality or compliance.
We offer fully flexible OEM/ODM modifications, including trailer chassis customization, vehicle-integrated hydraulic lifting setups, variable pulse mass weights (7 kN to 250 kN), customized sensor arm spans, multi-language software localized for specific regional backcalculation formulas, and custom branding for commercial testing agencies.
Every piece of testing equipment sold by Zealchon comes with our Three Guarantees policy (repair, replacement, and return protection), backed by lifetime software updates, remote diagnostic support, and on-site engineering commissioning upon request.
Zealchon Electronic
