Main Article Content
For long it had been debated on the utilization of recycled concrete aggregates in structural concrete as a viable resolution to the extreme pressure that indiscriminate mining imparts on the natural resources. It also has sought a way out of the negative impact the construction as well as Demolition waste can cause on the environment. An attempt is made to study the bevavior of concrete on its compressive and Flexural properties usingRecycled or Processed aggregate concrete (RAC) and ordinary concrete (OC) blended with Microsilica and iron fibers or Glass fiber(GFs). The modifying effect Microsilica and fibers can bring on the compressive strength, fracture toughness, modulus of elasticity, and failure mode of the RAC and OC were examined by means of a series of axial compression and three-point bending tests. It has been noticed that the use of thick iron fiber caused a negative effect on the inter- facial bonding with the cement paste, where as the use of Glass fiber fared better. Microsilica when added in small percentages improved the interfacial bonds, thereby bringing about substantial increase in the compressive and flexural properties of the RAC and OC. It was also found that the blending effect of Microsilica and iron fiber was better than that of the Microsilica and GF. Various percentage of individual components was used to cast samples taking into account the cost and all the criteria governing the performance improvement. It was decided to use 12% Microsilica content by the equal quantity substitution of cement method and eventually proved better than substitution by weight of cement method on the compressive and flexural strength of iron-fiber reinforced RAC.