Research on Damage Source of Cracking on the Surface of Asphalt Pavement and Its Influence Factor
To explain the damage source of cracking on the surface of asphalt pavement,the mechanical response of pavement surface of semi-rigid base asphalt pavement and composite base asphalt pavement is discussed by the SHELL pavement design software BISAR 3.0.Meanwhile,the influence of material modulus,horizontal force,interface contact condition and vehicle overload on the mechanical response and damage source of semi-rigid base asphalt pavement surface is analyzed.The results show that the boundary of the loading action area on the asphalt pavement surface is determined as the damage source of cracking,which is in agreement with conclusions from theoretical analysis,and the longitudinal Top-Down cracking occurs on boundary of the loading action area.The mechanical response of semi-rigid base asphalt pavement surface basically does not change under the different factors.The boundary of the loading action area is weak areas of mechanical response on the surface.The maximum tensile stress and maximum tensile strain appear on the boundary of the loading action area,and stress state also sudden changes.The influence of elastic modulus,horizontal force,vehicle overloads and interface contact condition on the mechanical response at boundary of the loading action area decrease successively.Except for the smooth interlayer contact condition between asphalt layer and base layer,the generated probability of surface cracking is increased by the other factors.The research results can provide reference for the understanding and prevention of surface defects of asphalt pavement.
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