<p>The scarcity and over depletion of raw materials necessitates the search for alternate aggregates in concrete. Despite the strong inclination for the maximum utilization of waste aggregates in concrete, the macro and micro mechanics of such modified concrete remain quite vague. The present study explores the viability of incorporating plastic waste aggregate (PWA) and glass cullet (GC) as partial substitutes for traditional aggregates in concrete, with a focus on maximum utility and finding the limit of tolerance. The replacement levels of PWA were chosen between 0 and 50%, whereas glass cullet was introduced in 10%. The experimental programs involved compressive strength, flexural strength, impact resistance, bond strength, water absorption, ultrasonic pulse velocity (UPV), acid and sulphate attack, rapid chloride penetration test (RCPT), thermal conductivity and SEM analysis. The results indicate that, substitution of PWA in concrete reduced the compressive strength, the strength loss was proportional to the percentage replacement. In the series of mixes with PWA, the compressive strength and flexural strength of concrete reduced by 12.6% and 6.5%, respectively with a replacement level of 15% PWA. However, the addition of GC in the PWA concrete had positive impact on strength properties. A maximum impact energy absorption capacity of 56.3 Joules was observed for PWA and GC concrete which was twice as that of the reference mix. The maximum energy absorption noticed for mix containing 15% PWA and combined PWA 10%: GC 10% were 240% and 218%, respectively. The durability results were in alignment with the UPV results indicating negligible pore formation is the ITZ area. The mixes containing GC showed reduced water absorption, mass loss and strength loss in acid and sulphate immersion of concrete samples. The morphology analysis revealed some isolated debonding of the recycled aggregates which can be mapped with the reduction in strength properties.</p>