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LBT-FWD Pavement In-Service Falling Weight Deflectometer

The FWD series falling‑weight deflectometer was developed based on the Danish Dynatest 8000 series, incorporating the technological strengths of international brands while adapting to China’s road conditions and the practical needs of testing agencies. The operating principle of the falling‑weight deflectometer is as follows: a hydraulic system lifts a hammer to a preset height, then releases it, allowing it to fall freely and impact a load plate placed on the pavement under test, thereby inducing a measurable deformation in the pavement. Simultaneously, the data acquisition controller records the pavement deflection measured by a closely coupled deflection sensor and the impact force measured by a load cell. The system can also collect ambient air temperature, pavement temperature, asphalt temperature, and GPS data. Data are acquired and analyzed using a portable computer running Windows XP, Windows 7, or Windows 8, along with dedicated software.

Category:

Pavement, Subgrade, and Aggregate Testing Equipment

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lbt@lbt.ltd

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+86-15102211717

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LBT-FWD Pavement In-Service Falling Weight Deflectometer

Description

Product Introduction:

Working principle of the falling-weight deflectometer:

After lifting the hammer to the set height via the hydraulic system, the hammer is released and falls freely, impacting the bearing plate placed on the pavement under test, thereby inducing a specific deformation in the pavement. Simultaneously, the data acquisition controller records the ground deformation measured by the deflection sensor in close contact with the pavement, as well as the impact force measured by the load cell. The system can also collect ambient air temperature, pavement temperature, asphalt temperature, and GPS data. A portable computer running Windows XP, Windows 7, or Windows 8, along with dedicated data acquisition software, enables data analysis and processing.

Technical Specifications:

Parameter Name	Parameter content
Drop hammer system mass	450kg
Hammering method	Hydraulic hammer connection
Power supply method	The vehicle’s generator provides it directly.
Single-point test time	25–30s
Settlement sensor type	Magnetoelectric velocity sensor (Sensor brand)
Settlement range	-2500 μm to +2500 μm
Number of settlement sensors	1, 5, and 7 are optional.
Settlement test accuracy	Better than 2%
Settlement resolution	0.1 μm
Load sensor type	Strain-gauge force sensor
Maximum load	150 kN (expandable to 250 kN)
Load range	12–150 kN
Load pulse shape	Half-sine wave
Load test accuracy	Better than 2%
Load resolution	0.1 kN, 1 kPa
Temperature sensor type	Platinum Resistance/Infrared
Temperature range	-50～100℃
Temperature measurement accuracy	0.5%
Temperature resolution	0.1℃
DMI measurement accuracy	0.1%
DMI resolution	0.1m
Loading disk format	A four-piece sector disc with a diameter of 300 mm.
GPS positioning accuracy	Within ±1 meter horizontally
Front-end display	Station numbers and audio prompts for driver reference.
Self-balancing system	Ensure the balance of the drop hammer system during both ascent and descent.

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FAQs

Do you supply full-set testing instruments for asphalt and geotechnical engineering projects?

We offer complete lab solutions including asphalt viscosity tester, asphalt rutting tester, geotextile permeability tester, low-temperature flexibility tester and concrete/cement test equipment, covering raw material detection for road, water conservancy and construction engineering projects

Can you customize fixtures or test machines based on our special test requirements? How about after-sales service and warranty?

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Does your pipe pressure burst testing machine control test temperature automatically? What’s its main application?

Yes, the constant-temperature circulating system keeps stable test environment during long-time hydrostatic resistance and instant burst pressure measurement of thermoplastic pipes. It complies with GB6111 standard and serves raw material inspection, new product R&D for plastic pipe manufacturers, third-party testing labs and university laboratories.

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What test items can your WDW series computer-controlled electronic universal testing machine complete? Which international standards can it meet?

Our WDW universal tester is applicable for tension, compression, bending, shearing and peeling tests of metal, plastic, rubber and composite materials. It supports test procedures in accordance with GB, ISO, ASTM, DIN, JIS multiple domestic and global standards. Equipped with high-precision servo drive and dedicated test software, it automatically collects, calculates and exports test data including tensile strength, elongation at break and elastic modulus.

Customer Reviews

European Plastic Pipe Manufacturer｜Purchase: Ring Stiffness & Hydrostatic Burst Tester

From Thomas Bennett, Quality Director, UK plastic pipe factory

2026.06.05

★★★★★

“We have purchased two sets of pipe testing equipment from Laibote (Tianjin) for 18 months. The ring stiffness and hydrostatic burst testing machines run stably for daily batch inspection, test data matches ISO standard requirements precisely, and the intelligent test software is easy for our operators to master. Their after-sales team offers timely remote technical guidance whenever we have operational problems, spare parts supply is efficient. We have arranged a second bulk order for our new production workshop and will recommend Laibote’s testing machines to our industry partners across Europe.”

Middle East Construction Lab｜Purchase: Universal Electronic Testing Machine & Geotextile Test Equipment

From Mohamed Kareem, Lab Manager, UAE third-party construction inspection institute

2026.06.05

★★★★★

“We compared multiple testing equipment brands from Europe and China before cooperating with Laibote. Their WDW universal tester and full-set geotextile testing instruments meet local construction testing standards perfectly. Custom fixtures tailored per our specimen specifications save much testing time. Pre-sale technical communication was patient and professional; engineers provided online operation training after goods arrived. Stable machine performance greatly improves our laboratory’s detection efficiency, we are satisfied with cost performance and overall service.”

Southeast Asia Rubber & Polymer Factory｜Purchase: Vicat Softening Point & Tensile Testing Machine

From Tanaka Hiroshi, R&D Supervisor, Indonesia rubber materials enterprise

2026.06.05

★★★★★

“Laibote’s Vicat softening point tester and electronic tensile machine have been applied to our raw material incoming inspection and new formula development for over one year. High testing accuracy effectively controls our product defect rate. What impresses us most is their responsive after-sale service; technical staff reply our troubleshooting requests within 24 hours even for time zone differences. Compared with expensive European brands, Laibote’s equipment balances quality and price excellently, we plan to expand procurement of auxiliary testing instruments next quarter.”

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LBT-FWD Pavement In-Service Falling Weight Deflectometer

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Address:Tianjin Jinghai Economic Development Zone

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