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Dynamic Plate Test Devices (DPT)

Dynamic Plate Test Device
 

Dynamic Plate Test Device is a term used to describe various types of equipment primarily used to assess the in situ performance and strength of pavements and foundations or granular materials using a test load dynamically applied through a circular plate. They include devices commonly termed Falling Weight Deflectometers.

Dynamic Plate Test devices can either be hand held machines or devices built into a vehicle or mounted on a trailer and towed behind a vehicle. Each device incorporates a circular loading plate that is placed onto the surface under test. The device applies a known load to the plate creating an impact load. The vertical deflections produced by the impact are measured at the centre of the plate and optionally at a series of radial positions from the centre. The measured deflections are a function of the applied load and are used to determine the structural condition of the structure under test.

DPTs are classified by the load that they can apply to the test plate. There are four main classifications, A to D:

Class Generic name Load Range (kN)
A Lightweight Deflectometer (LWD) 1-15
B Falling Weight Deflectometer (FWD) 30-120
C Heavyweight Deflectometer (HWD) 30-240
D Super-Heavyweight Deflectometer (SHWD) 30-300


Class A devices are typically used for assessing the in situ structural condition of pavement foundations in the construction of new roads, airfields, ports and other structures. Class B, C and D devices are typically used for assessing the structural condition of in-service road pavements, airfields, ports and other structures.

The Accreditation and QA requirements for Class B, C or D Dynamic Plate Devices are given in the Accreditation and QA specification .

Accreditation_and_QA_of__DPT_devices Issue 2.0 July 2016

If you are looking for a contractor to undertake a survey using a Class B, C or D Dynamic Plate Device on your behalf, you may wish to check the list of DPT machines and their certificates . The Department for Transport provides guidance on the usage of DPTs in the assessment of new foundation construction  and for in-service pavement assessment.

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Title Type Published
M02_Ser No 8002-102 1

Date of expiry 5 November 2017...

DPT 5/10/16
M05_Ser No 8082-050

Date of expiry 5 November 2017...

DPT 5/10/16
M06_Ser No 8082-018 7

Date of expiry 5 November 2017...

DPT 5/10/16
M08_Ser No 8002-028

Date of expiry 5 November 2017...

DPT 5/10/16
M09_Ser No 8002-136

Date of expiry 5 November 2017...

DPT 5/10/16
M10_Ser No 8002-192

Date of expiry 5 November 2017...

DPT 5/10/16
M11_Ser No 8002-187

Date of expiry 5 November 2017...

DPT 5/10/16
M13_Ser No 8082-029

Date of expiry 5 November 2017...

DPT 5/10/16
M15_Ser No 8002-203

Date of expiry 5 November 2017...

DPT 5/10/16
M16_Ser No 8002-214

Date of expiry 5 November 2017...

DPT 5/10/16
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