Abstract
The permanent deformation behavior of granular materials governs the overall performance of railway track substructures. This article evaluates the cyclic behavior of construction and demolition (C&D) aggregates, namely recycled concrete aggregate (RCA) and crushed brick (CB) blended with recovered plastic (RP) as railway capping layer materials. The response of C&D/RP blends was evaluated under multistage cyclic loading using the shakedown theory. The accumulation of permanent strain, variation of resilient modulus, and changes in permanent strain rate were assessed to classify the performance of the recycled blends. The inclusion of RP in C&D materials was found to compromise the stiffness characteristics of the recycled blends. However, all the C&D/RP blends had similar or lower permanent strain than that of the conventional materials. Conversely, the energy dissipation of the recycled blends was found to increase when the RP content was increased. Thus, C&D/RP blends can be introduced as sustainable energy-absorbing geomaterials.
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