Tierakenteen rasittuminen yli 76 tonnin HCT-yhdistelmien koekuormituksissa vuosina 2015-2018: Yhteenvetoraportti
Research output: Book/Report › Commissioned report › Professional
|Number of pages||30|
|Publication status||Published - 2019|
|Publication type||D4 Published development or research report or study|
In addition to the main test results, the summary report contains main observations about carrying out the loading tests and selecting the test sites, as the results of all test loadings could not be utilized in the comparisons of the loading vehicles. Reason for that has been for example the too different initial conditions to make reliable comparison between the loading vehicles.
The main purpose of the researches have been to estimate whether the 14-axis loading vehicles cause more rutting than the 7-axis loading vehicles when the loading mass was equivalent in the same time based on the short loading tests carried out in 2017 and 2018. In the researches, the 14-axis loading vehicles did caused more rutting than the 7-axis loading vehicles on gravel and thin-paved roads located on soft, wet soils. On thick-paved roads, the 14-axis loading vehicles did not caused any more rutting than the 7-axis loading vehicles.
The driving lines of the heavy vehicles have a significant influence on the increase rate of rut depth. In spring 2018, rut depth could be reduced by varying of the driving lines at the Kyyjärvi and Simo test sites. Thus, with autonomous driving, part of vehicles could be steered to reduce rut, at least on straight road sections.
In addition, the measurements also showed that there was a clear increase in rut depth at the spots of the road structure where moisture increase has been observed in MDI (Moisture damage index) analyzes.