Effect of Adding Lime and Volcanic Scoria on the Performance of Recycled Concrete Aggregates

In the study, lime and volcanic scoria have been added as cement replacement in an attempt to improve the performance of recycled aggregate concrete. The use of such eco-friendly materials could also promote a further greening practice in the concrete industry. The concrete performance was evaluated in terms of mechanical properties and concrete permeability. Mechanical properties investigated include compressive strength and modulus of elasticity of concrete. Water permeability, chloride penetrability have particularly been studied to evaluate the permeability properties. The results revealed that the use of such materials could produce greater compressive and modulus of elasticity than those of the recycled aggregate concrete alone. Further, the results showed that permeability properties of recycled aggregate concrete have significantly been improved with addition of these additions. Basaltic aggregates were used for comparison and SEM analysis was employed as well