Accelerated load testing of pavements: HVS-NORDIC tests at VTI Sweden 2003-2004

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Leif G Wiman

During 2003 and 2004 two accelerated load tests were performed at the VTI test facility in Sweden (SE05 and SE06). The objective of SE05 was to investigate the deformation behaviour of two different unbound base materials. Half of the test area was constructed with a base layer of natural granular material and the other half with a base layer of crushed rock aggregate. This means that the two structures were tested simultaneously. The objective of SE06 was to be the third test in a series of structural design tests with stepwise higher bearing capacity. The previous two tests in this series are SE01 and SE02. In the unbound base material test, SE05, the surface rut depth propagation during the accelerated load testing was greater on the crushed rock aggregate structure especially in wet condition. This was not expected and more than half of the difference in surface rut depth was found in the difference in the base layer deformations. One main reason for this unexpected behaviour is believed to be unsatisfactory compaction of the crushed rock aggregate. The performance of the pavement structures SE01, SE02 and SE06 during the accelerated load testing will be analysed in more detail in the future. One preliminary conclusion is that there seems to be a fairly strong correlation between the rut depth propagation in dry condition and surface deflections from falling weight deflectometer (FWD) measurement on these three structures with gradually increasing bearing capacity.

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