Rutting susceptibility of asphalt concrete with recycled concrete aggregate using revised Marshall procedure

• Marshall design method is revised for specimen size and aspect ratio requirement.
• Design number of blows are calculated based on concept of energy density.
• Effect of mixture gradation is more significant than that of RCA content.
• Slope constant and flow number describe rutting susceptibility of asphalt mixtures.
• RCA addition increases permanent deformation resistance of coarse graded mixtures.

Natural aggregate is the primary ingredient of asphalt concrete and Portland cement concrete mixtures. Recycled concrete aggregate (RCA) derived from demolition wastes can be used in asphalt mixtures to eliminate potential problems arising from disposing these materials and conserve natural aggregate resources. This study presents methods for using RCA in asphalt mixtures based on repeated creep tests. The standard Marshall mixture design method is revised to prepare specimens satisfying the minimum size and aspect ratio requirement in uniaxial testing. The study shows that addition of RCA can improve the resistance of mixtures to permanent deformation and hence, rutting depending on mixture gradation.