Abstract
In this research we used our newly made freeze-thaw CBR test apparatus to examine the effect of freeze-thaw action on the bearing capacity of base course material C-40. It was found that freeze-thaw history caused a decrease in the CBR in all water content conditions. Because the freeze action promotes to drain of particle pore water, it caused the decrease in interparticle friction and the change in void structure, which resulted in the deterioration of CBR. It was also found that while the CBR deterioration brought from the decrease of interparticle friction recovers over time, which brought from the change of void structure does not recover.
