Improving the quality of recycled fine aggregates by selective removal of brittleness defects

摘要

This study presents a method for improving the quality of recycled fine aggregate by selectively removing these defects.Fourteen recycled fine aggregates were manufactured by three types of processors including a jaw crusher,ball mill,and granulator.The influence of the recycled fine aggregate on the fluidity and strength of the mortar was evaluated.The results showed that fluidity was mainly affected by the filling fraction of the recycled fine aggregate and the content of components passing through a 0.075-mm sieve.Both the compressive and flexural strengths of the recycled mortars were unaffected by the filling fraction,but they were affected by the fraction of defects and surface smoothness.Furthermore,the results clearly showed that polishing is effective both for increasing the filling fraction of recycled fine aggregates and reducing the fraction of defects in the aggregate,thereby resulting in greater fluidity and strength of the mortar.