[01] Saad Issa Sarsam, Department of Civil Engineering, College of Engineering, University of Baghdad, Baghdad, Iraq. [02] Abeer Husain, Department of Civil Engineering, College of Engineering, University of Baghdad, Baghdad, Iraq.

Settlement of road way embankment at grade separation intersections, and highway bridge abutments is a widespread problem in Iraq. Typical subgrade soil usually used for embankment construction by Mayoralty of Baghdad was investigated. The aim of this work is to study the effect of Nano-materials additives such as Lime, coal fly ash, and Silica fumes on the durability of asphalt stabilized soil in terms of (freezing-thawing) cycles and (heating-cooling) cycles The optimum fluid content was 15% (6% cutback asphalt + 9% water). The optimum Nano-materials content requirement was determine by using repeated indirect tensile strength test. The optimum Nano-materials was (2%) for each of lime, and silica fumes. The failure criteria was a target permanent deformation. The reduction in deformation was (47.6%, 8%) for lime and silica fumes specimens respectively. Durability of asphalt stabilized soil, mixed with optimum Nano-materials in terms of (freezing-thawing) cycles and (heating-cooling) cycles was investigated by using repeated indirect tensile strength test. The variation in rate of deformation among various Nano materials was detected. Tensile strength was increase by (6.6% and 39.6%) when (2%) of silica fumes or lime were implemented respectively. Punching shear for asphalt stabilized soil increases by (47.4%) when (2%) lime was added, while it decrease by (10.5%) when (2%) of silica fumes was added. However, the percentage of losses in weight for the specimens exposed to durability test increases with increment of durability cycles.

Nano Materials, Durability, Cutback Asphalt, Punching Shear, Repeated Indirect Tensile Strength, Sub Grade

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