Abstract
We used a newly developed freeze–thaw California bearing ratio (CBR) test apparatus to investigate the effects of freeze–thaw history on the bearing capacity characteristics of granular base course material. It was found that CBR was reduced by freeze-thaw under all water content conditions. Taking the example of C-40, which is frequently used as a base course material, freeze–thaw cycles reduced CBR to about 0.6 times its initial value. We found volume expansion in even non-frost susceptible C-40, and therefore investigated changes in particle pore water due to freeze–thaw cycles. We found that freezing causes particle pore water to be dislocated to particle surfaces, thereby causing interparticle friction and altering the void structure.
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