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Wholesale Geophone handheld drop light weight falling weight deflectometer FWD Supplier, Suppliers
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Wholesale Geophone handheld drop light weight falling weight deflectometer FWD Supplier, Suppliers

Wholesale Geophone handheld drop light weight falling weight deflectometer FWD Supplier, Suppliers

Falling Weight Deflectometer (FWD) is a non-destructive testing device used to evaluate the performance of rigid or flexible pavement structures such as roads and airport runways. It simulates the dynamic impact of vehicle loads on the road surface, measures the deflection response of the road surface, and analyzes the bearing capacity, layered modulus, and potential damage of the road structure.

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Product Description

Working Principle

Impact load simulation:
By using a hydraulic system, a hammer of a certain mass (usually 50-300kg) is lifted to a predetermined height (such as 10-30cm) and then freely falls to impact the bearing plate (usually 30cm in diameter), generating a transient pulse load (lasting about 25-30 milliseconds), simulating the dynamic wheel load during vehicle operation (equivalent to standard axle load, such as 50kN or higher).
Bending measurement:
Under the action of impact load, the road surface undergoes elastic deformation (deflection). By arranging high-precision sensors (such as velocity or acceleration displacement sensors) at the center of the bearing plate and different radial distances (such as 0, 30, 60, 90cm, etc.), the dynamic deflection time history curves of each measuring point are recorded, and the maximum deflection value (μ m level accuracy) is extracted.
Data collection and analysis:
The system automatically collects deflection Basin data and combines inversion algorithms (such as elastic layered system theory) to calculate the elastic modulus of each structural layer (asphalt layer, base layer, soil foundation) and evaluate the structural integrity.

Advantages:

  • Fast, non-destructive, and high-precision;
  • Dynamic loads are closer to actual traffic conditions;
  • Multi sensor synchronous measurement provides spatial deformation information.

Product Features

1. Imported sensors and parts of components are used to achieve high test accuracy.

2. LCD display in English, with backlight, has better visibility in various environments.

3. Easy to operate and fast to test. It only takes 35 seconds to detect a point.

4. Automatically calculate Evd value and display curve, accurate and intuitive.

5. Hand-held mainframe with Bluetooth micro printer for ensuring the accuracy and objectivity of the test results.

6. USB transmission interface, easy to connect with the computer.

7. The Falling Weight Deflectometer simulates the impact effect of high-speed train on subgrade, reflecting actual subgrade soil stress.

Product Feature Image

Application Scenarios

Application Scenario Image
Road surface structure evaluation: Detecting hidden diseases such as loose base, void, and weak soil foundation.
Maintenance decision: Based on the shape of the deflection basin, determine the damaged layer and guide milling or reinforcement.
Construction quality control: Verify the compaction and uniformity of the newly constructed road surface.
Inverse modulus calculation: Use software to invert the material parameters of each layer.

Technical Parameters

Product Name Evd Dynamic Deformation Modulus Tester
Maximum impact force 7.07kN
Impact duration 17.0 ± 1.5ms
Power supply 4 R6 batteries
Measurement range of settlement value 0.1-2.0mm ± 0.02mm
Applicable material types Various types of soil and soil rock mixed fillers
Scope of testing 10MPa ≤ Evd ≤ 225MPa
Test the depth of impact 0 ~ 500mm
Working environment temperature -10 ~ 40 ℃
Material Aluminum alloy
Whole machine volume 1220 × 395 × 380mm
Weight 56kg

Frequently Asked Questions

Q1: What is the main purpose of the Evd Dynamic Deformation Modulus Tester?
It is primarily used to evaluate the dynamic deformation modulus of subgrade soil under impact load, simulating the stress conditions of high-speed traffic.
Q2: How long does a single test point take?
The system is designed for efficiency; it typically takes only about 35 seconds to complete the detection for a single point.
Q3: Does the device support on-site data printing?
Yes, the hand-held mainframe is equipped with a Bluetooth micro printer that can print results directly on the spot for immediate verification.
Q4: What is the measurement range and accuracy?
The measurement range for the settlement value is 0.1mm to 2.0mm with an accuracy of ± 0.02mm, covering a testing scope of 10MPa to 225MPa.
Q5: Is the equipment suitable for extreme temperatures?
The tester is built to operate reliably within a temperature range of -10℃ to 40℃, making it suitable for various field environments.
Q6: Can the data be transferred to a computer for further analysis?
Yes, the device features a USB transmission interface, making it easy to connect to a computer for data storage and detailed analysis.

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