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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 survey devices below. On this page you can also find the latest accreditation certificates. In this table machines are referred to as having met criteria if they have met the mandatory criteria as defined in the Accreditation and QA specification for these devices. Some Network Authorities may also require a specific level of performance in some or all of the additional tests. Please see the certificates for more detail on the performance of these devices in these additional tests.The Department for Transport provides guidance on the usage of DPTs in the assessment of new foundation construction  and for in-service pavement assessment.

Certificates from previous years can be found here.

ID Model and Serial Number Class Operating Company Met criteria Certificate
2 8002 SN 102 B AECOM Yes 2016 DPT M02 (8002-102)
5 8082 SN 050 C AECOM Yes 2016 DPT M05 (8082-050)
6 8082 SN 018 C PMS Ltd. Yes 2016 DPT M06 (8082-018)
8 8002 SN 028 B AECOM Yes 2016 DPT M08 (8002-028)
9 8002 SN 136 B PMS Ltd. Yes 2016 DPT M09 (8002-136)
10 8002 SN 192 B AECOM Yes 2016 DPT M10 (8002-192)
11 8002 SN 187 B Forth Bridge constructors JV Yes 2016 DPT M11 (8002-187)
13 8082 SN 029 C AECOM Yes 2016 DPT M13 (8082-029)
15 8002 SN 203 B CET Safehouse Yes 2016 DPT M15 (8002-203)
16 8002 SN 214 B PTS Yes 2016 DPT M16 (8002-214)
28 8002 SN 271 B Pulse Surveying Yes 2016 DPT M28 (8002-271)
30 8002 SN 173 B PMS Ltd. Yes 2016 DPT M30 (8002-173)
32 8082 SN 069 C PTS Yes 2016 DPT M32 (8002-069)
33 8082 SN 070 C PTS Yes 2016 DPT M33 (8082-070)
34 8082 SN 108 C PTS Yes 2016 DPT M34 (8082-108)
36 PRI2500 SN 0608- 303 C TestConsult Yes 2016 DPT M36 (PRI2500 0608-303)
37 8000 SN 352 B Stanger Yes 2016 DPT M37 (8002-352)
38 PRI1500 SN 1111-448 B Milestone Yes 2016 DPT M38 (PRI1500 1111-448)
39 8002 SN 388 B TRL Yes 2016 DPT M39 (8002-388)
40 8012 SN 002 B Dynatest Yes 2016 DPT M40 (8012-002)
41 8082 SN 145 C ALC (MoD) Yes 2016 DPT M41 (8082-145)
44 8082 SN 156 C Dynatest Yes 2016 DPT M44 (8082-156)
45 PRI2100 SN 0903-088 C Atlas Geophysical Yes 2016 DPT M45 (PRI2100 0903-088)