Said Kenai
University of Blida
Algeria
Title: Performance of ordinary and self compacting concrete using recycled concrete aggregates
Biography
Biography: Said Kenai
Abstract
Construction industry consumes a lot of mineral resources and is the most energy intensive sector. In addition, it is responsible for a high percentage of green house gas emissions and hence has large environmental impact. The use of recycled concrete aggregates from rubble and demolition waste in combination with cementitious additions could contribute to an environment friendly construction by reducing CO2 emissions and reducing the consumption of natural resources. In this paper, the performance at the fresh and hardened state of an eco-concrete (ordinary and self compacting) made of recycled concrete aggregates and either natural pouzzolana or granulated blast furnace slag is discussed. Natural aggregates were either partially or fully substituted by recycled aggregates and cement was partially substituted by either natural pouzzolana or slag. The results showed that an ordinary recycled aggregates concrete with comparable mechanical properties and durability to natural aggregates concrete could be produced. The use of recycled aggregates gives a self compacting concrete with comparable rheological properties to that of control concrete. The substitution of cement by natural pouzzolana decreases the workability of the control concrete whereas the use of slag improves it. However, an improvement has been noted for SCC made with recycled concrete aggregates.