Waste arising from construction and demolition constitutes one of the
largest waste streams within the developed and developing nations. Of this a large
portion of potentially useful material is disposed as land fill. The environment and
economic implications of this are no longer considered sustainable and, as a result
the construction industry is experiencing more pressure than even before to
overcome this practice. On the other hand, in recent years the wisdom of continued
whole sale extraction and use of aggregates from natural resources has come under shutting at international lend. This is because of the depletion of quality primary aggregate and greater awareness in environmental protection. In order to overcome this problem, the idea of using the construction debris came into existence. This gave a rise to inception of recycled aggregate. Recycled aggregate are basically comprised of crushed, graded inorganic particles produced from the concrete, which has been previously used in construction. The objective of present study is to determine the sustainability of recycled aggregate an alternate material to coarse aggregate material to normal coarse aggregate and to compare the permeability using fly ash of recycled aggregate concrete with that of natural aggregate concrete. The investigations were carried out in the fresh and hardened state properties of concrete. The compressive strength of recycled aggregate for each grade increases till 20 % fly ash and decreases for 30% addition of fly ash. The permeability of recycled aggregate concrete using different proportions of fly ash and natural aggregate concrete were tested. There were total of 4 batches of concrete mixes of grade M20, M25, M30, M35 with 100% replacement of conventional aggregate with recycled aggregate. The result is encouraging and permeability of recycled concrete is more compared to the natural aggregate concrete, further, the addition of fly ash concrete improved the permeability characteristics of recycled aggregate concrete.