22.2.2008 10th Anniversary
Roadscanners celebrated its 10 th Anniversary in February. Customers and associates were invited to anniversary seminar, reception and evening celebration.
6.9.2007 Helsinki office's new address
Roadscanners Helsinki Office's New address is Atomitie 5 FIN-00370 Helsinki
3.4.2007 New office to Helsinki
Roadscanners has opened 2.4.2007 new office to Helsinki. Helsinki office's manager is Markku Knuuti , M.SC. Civil Eng.
11.11.2006 New PhD from Roadscanners
Roadscanners Oy´s managing director Timo Saarenketo’s PhD thesis “Electrical properties of road materials and subgrade soils and the use of Ground Penetrating Radar in traffic infrastructure surveys” was presented on 11.11.2006 at the University of Oulu.
Timo Saarenketo’s PhD thesis is composed of a synopsis and five published papers that are focused on both the research results of studies on electrical properties of road materials and subgrade soils and their seasonal changes, and the use of Ground Penetrating Radar technique in traffic infrastructure surveys. The hypothesis of the work has been to test how the electrical properties, which can be analyzed from the GPR data, can be related to the technical properties of traffic infrastructure materials. The survey data, which includes road, bridge, railway and airport structures, has been collected in Finland, U.S.A., Scotland and Sweden and represents a broad range of different climatic and geological conditions.
The laboratory results present not only the relationship between the water content and dielectric value and electrical conductivity of the materials but also other chemical, mineralogical and mechanical properties. Results showed that problem construction materials differ electrically from the good quality materials. Thus by analyzing the frequency response of the GPR data it is possible to locate problem materials in roads even during the dry summer months when the bearing capacity of the road is good.
During the thesis work, a new laboratory test, the Tube Suction test, was developed to test the moisture susceptibility of base course materials. In the U.S.A., it is currently recommended that this test be used to test the frost susceptibility of base course materials. Field test data collected using the Percostation technique also demonstrate that a knowledge of seasonal changes and thermodynamics is very important in understanding and modeling the mechanical behavior of road structures. Percostations are currently being used to monitor the seasonal changes of roads in Finland, Sweden and Scotland. Furthermore, these stations can be used to monitor the impacts and recovery times of the road structures under heavy axle loads.
Saarenketo’s research demonstrates that the GPR technique not only gives valuable structural information on the different types of structures and subgrade soils but it also provides a wide range of information on the electrical properties of the materials under survey which can be further related to their mechanical performance. The best information will be obtained if GPR data is analyzed together with other non destructive testing data collected from the roads, railways and airports.
The thesis can be downloaded from the University of Oulu www-pages: