Kontrollmetoder för aktiv design på obundna granulära material

Sammanfattning: Today a newly built road has high standards on the bearing capacity; it should withstand the rigors of heavy traffic. To test the roads ability to cope with the oversized strain we use heavy and light weight case, static plate load or YPK (Wide area compaction control) as a control for bearing capacity. The method is used to measure the roads E-module, which is a measurement of the bearing capacity. To understand the term ”bearing capacity”, knowledge from other fields must be gathered. Fields such as geotechnology, road construction, packing, checking and deformation. In the current situation the roads are not optimized for its purpose along the entire route. This because the bearing capacity may be varied, which means that certain parts of the road can break before others. With an active design the road is constructed in places according to the bearing capacity. This results in a more even life expectancy of the entire route. A field trial was made during April of 2012 in Gislaved on the reconstruction of one existing road and a new development outside of Gislaved. Heavy weight case and plate loading tests was made on the sub base. The most emphasis was made on checking the bearing capacity and the degree of compaction in the roads construction to see if there is any connection between static plate load and heavy weight case. The test results was also used to conduct an active design of the road using a specialized computer program to calculate the thicknesses required for the bound material. Comparisons with the normal sections have shown that the road will cope with the set traffic load and that the active design contributes to a more even life expectancy along the entire route. An evaluation of old and new results have shown benefits with heavy weight case compared to using a plate load. Heavy fall weight is a fast and informative method of controlling bearing capacity and packing. Keywords: Bearing capacity, FWD, PLT, packing, checking and active design.