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Home » Products » Pavement Testing » Falling weight deflectometer » Heavy Weight Deflectometer HWD

Heavy Weight Deflectometer HWD

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TBTHWD-NJ-M is a non-destructive testing instrument for pavement and airport upgraded from original FWD, besides pavements bearing capacity, it also can be used for non-destructive testing of stiff bound material as found on Airport Runways and truck car parks.

  • HWD-NJ-M
  • TBTSCIETECH
  • HWD-NJ-M

A four-part split loading plate is placed on the surface of pavement and a load pulse is applied to the plate. The load pulse is generated by the impact of a falling weight. The load pulse is designed to cause a deflection that closely simulates the deflection of actual aircraft wheel loading up to 250KN.

Utilising 9 pcs deflection sensors to measure deflection basin and collect the information to determine surface material strengthBy combining this data with Layer thickness, resilient E-moduli can be determined, and further analysis can determine bearing capacity, structural strength, overlay design and expected surface life, then achieve proper maintenance.


No.

Description

Content

1

Usage

Structure strength test for airport road pavement

2

Main unit

Trailer, deflectormeter, laptop, software

3

Specification


3.1

trailer

Trailer type:

1brake system

2traction device

3signal device

4safety sign

5alarm

6speed: 0~120km/h

7trailer length:4m

8front angle34°

9axle: two axle

3.2

Main function

1auto deflection testing and loading

2auto ambient, surface temp. testing

3auto locking function

4can record more than 60ms data

5auto record deflection, load, temp. GPS and other data

6can do DMI distance calibration and verification;

7hammer system up/down auto balance

 

3.3

Parameter

1working type: trailer type

2hammer lifting: hydraulic type

3power supply: traction device power, DC12V

4deflection sensor: 9pcs

5min. depth to earth : >20cm

6deflection range:-2500μm+2500μm

7deflection measuring accuracy: better than 2%

8deflection resolution0.1μm

9capacity0250kN

10loading accuracybetter than2%

11loading plate: D300mm OR D450mm(4-side profile)

12temp. Range: -50℃100℃

13temp. Measuring accuracy:0.5%

14temp. Measuring resolution0.1℃

15distance sensor accuracy0.1%

16testing time for each point: 35s3 hammer action

 


A four-part split loading plate is placed on the surface of pavement and a load pulse is applied to the plate. The load pulse is generated by the impact of a falling weight. The load pulse is designed to cause a deflection that closely simulates the deflection of actual aircraft wheel loading up to 250KN.

Utilising 9 pcs deflection sensors to measure deflection basin and collect the information to determine surface material strength. By combining this data with Layer thickness, resilient E-moduli can be determined, and further analysis can determine bearing capacity, structural strength, overlay design and expected surface life, then achieve proper maintenance.


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