Abstract: Method for detecting cracks in a road pavement by using a ground penetrating radar installed to a vehicle, the method comprises driving the vehicle along the road, scanning sections of the road, which scanned sections comprise at least one wheelpath area and at least one non-wheelpath area. The scanning includes transmitting electromagnetic pulses to the road, receiving reflected electromagnetic signals from the road, recording the received electromagnetic signals to a digital storage file and analysing the received electromagnetic signals. Analysing includes monitoring a selected high frequency range of the received signals over a selected monitoring interval, determining the spectral density of the received signals, calculating the differences of spectral densities of the wheelpath area and the non-wheelpath area and evaluating the presence of microcracks in wheelpath area based on the calculated differences in spectral densities. The monitored high frequency range is preferably of 3-4 GHz.

Abstract: In the method for operating a movable compaction device (10) during material compaction work the moisture content of the material to be compacted is monitored. The method comprises the steps of defining a compaction performance index for the material (100) to be compacted, said compaction performance index being an electromagnetic character correlating with the volumetric moisture content of the material, determining the compaction performance index value in a number of survey points of the material to be compacted during compaction work using electromagnetic measurement device and controlling the operation on the compaction device based on determined compaction performance index values.

Abstract: In the method an existing surface of a bearing course (120) of a traffic route is first chosen as the reference level (100), in relation to which the target level (150) of a surface of a bearing course to be formed is determined. After this the forming procedure of a bearing course is performed, in which the surface of a bearing course is brought to the target level. Typically the forming procedure comprises spreading, levelling and compacting of a soil layer on the surface of the reference level. The location of a traffic route is determined in the terrain as plane coordinate points (xn, yn) with a satellite positioning method and the elevation zn of an existing bearing course chosen as the reference level is determined in each coordinate point (xn, yn) as cross sectional figures extending from the unchanged terrain on the first side of the traffic route over the surface of the traffic route to the unchanged terrain on the second side of the traffic route.