A comparative study of two-stage mixing concrete against nominal mixing concrete

The innovative method of two-stage mixing approach developed to incorporate the recycled coarse aggregates from construction demolition waste to achieve the structural characteristics. This study investigates different levels of recycled aggregates substitution like 30%, 50% and 100% in combination of 10% metakaolin replacement with cement and addition of superplasticizers to achieve workability. During the preliminary mixing phase, the recycled aggregates are coated with cement slurry to avoid the internal voids and to decrease the porosity as a two-stage mixing strategical approach to address its weakness. The pre-treatment will help in creating the denser product with enhanced interfacial bond compared to the conventional method. By laboratory experiments, it is observed that the two-stage mixing approach consistently provides superior compressive and split tensile performance against conventional developed control specimens with identical ages of curing.