Surface Absorption Characteristics of Recycled Concrete

Abstract

Recycled aggregate is known to have higher water absorption produced due to the porosity of the cement paste adhered to the old concrete in the recycled aggregate, this in turn affects the durability. This study attempts to investigate the surface water absorption properties of recycled concrete when fly ash is added to concrete mix. In the mix proportion considered for study, 25% of natural coarse aggregate is replaced by recycled aggregate and 30 % Cement is replaced by fly ash. Surface water absorption property is studied experimentally by Initial Surface Absorption Test. Results indicate that pozzolanic properties of fly ash helps in reducing the water permeability of recycled concrete to a great extent.