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Low density polyethylene (LDPE) when dispersed in asphalt cement through a high shear blending process produces asphalt concrete mixtures (Novophalt) with superior resistance to deformation at high service temperatures. The dispersion of LDPE within the asphalt results in rheological changes in the binder which not only significantly improve resistance to creep deformation but also improve mixture shear strength. The ratio of induced octahedral shear stress in a paving mixture to the octahedral shear strength of the paving mixture at the specific conditions of loading is used to demonstrate the ability of Novophalt to reduce deformation potential of asphalt pavements through improved shear strength. The results of the shear strength analysis are corroborated by creep deformation and accumulated permanent strain analyses.
Modified asphalt, low density polyethylene, octahedral shear stress, octahedral shear strength, creep, deformation
professor of civil engineeringresearch engineer, Texas A&M UniversityTexas Transportation Institute of Texas A&M University, College Station, Texas