Experimental Study on Fly Ash Using for the Measurement of Preventing Frost Heave of Road

In order to avoid the frost damage to subgrade, an objective method that using fly ash as the anti-frost heave is proposed in this paper. The effects of the frost heave rate on the thickness of replacement layer, the depth of replacement layer and the depth of groundwater were investigated through the uniform design method. The mathematical model of the relationship between the frost heave rate and three influencing factors also was indicated by indoor simulated tests and regression analysis. The results show that the thickness and the depth of replacement layer respectively are 16 cm and 55 cm below subgrade, which provides the specific anti-freeze measurement to the guidance of design and construction.