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COMPARATIVE MEASURING CAMPAIGN INVOLVING THE PRIMA100, THE FWD AND SEVERAL OTHER WELL-KNOWN METHODS SUCH AS STP, DCP, VANE TESTING, PROCTOR AND ISOTOPE
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13/09/2006 |
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Being a developer and manufacturer of meauring equipment (PRIMA100 LWD and PRI2100 FWDs) Carl Bro Pavement Consultants (CBPC) need be proactive in order to demonstrate the specific merits of the equipment and its relation to other methods.
This spring CBPC took therefore initiative in a comprehensive field testing in close cooperation with the Danish Road Directorate. Equipment and staff from both parties took part in the project and external assistance was hired for some of the measurements. For three days more than 10 persons were active in the field.
Measurements were performed on a cleared planum.
Measurements were performed with PRIMA100 from CBPC, a light falling weight deflectometer from the Road Directorate, PRI2100 van-integrated falling weight deflectometer from CBPC, static plate-bearing testing (CBPC), Dynamic Cone Penetration test (CBPC), Troxler (VD), Vane Testing (external Geotechnical Company).
After the field testing compaction (6 passages) was made with roller.
The measuring series/sequence was repeated and finally samples were taken for Proctor compaction testing and general soil sample description. All measurements are performed in the same points and in an order that prevents the previous measuring method from influencing the results of the next measuring.
Measurements performed with PRIMA100 and another light weight deflectometer were performed in more heights and with more types of buffers. Measurements with PRI2100 FWD were carried out with Ø30 cm plate and with a tension corresponding to full drop height of the light weight deflectometer. The static plate-bearing tests were carried out with both Ø30 and Ø76 cm plates. DCP and vane testing were carried out from 0 to 2 m b. t.
The tests were carried out on two partial sections on motorway M30, which is under construction with the Danish Road Directorate as employer. The partial sections are expected to be stabilized with lime and the bearing capacity will therefore be relatively low. In both test fields are cohesive soils.
An extreme amount of measuring data were collected. The data will now be systematised and interpreted partly in order to present the results of all measurements, partly in order to let the results be part of the final edition of the Danish guide for measurements with light weight deflectometers. A final draft for the guide has recently been published on the homepage of the Danish Road Directorate – however, only a Danish version is available.
The results will become accessible on our homepage and this newsletter will bring an introduction.
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