Abstract
Crack initiation was studied for asphalt mixtures under external compressive loads. High tensile localized stresses near the edges of compressed air voids lead to the growth of wing cracks in the direction of the external loads. A quantitative crack initiation criterion was derived using pseudostrain energy balance principle. Bond energy is determined and it increases with aging and loading rate while decreases with temperature. Cohesive and adhesive cracking occur simultaneously and a method was proposed to determine the individual percentage. The crack initiation criterion is simplified and validated through comparing the predicted and measured compressive strength of the asphalt mixtures.
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