EFFECT OF ELONGATED CURING, RECYCLED AGGREGATES FROM DIFFERENT STRUCTURAL MEMBERS AND FLY ASH ON FLEXURAL BEHAVIOR OF GREEN CONCRETE

Abstract

In this research study laboratory investigation to check the effect of fly ash and recycled aggregates from different structural member is presented. 35% recycled aggregates and 10% fly ash were used as replacement of conventional coarse aggregates and cement respectively. Seven batches of concrete were prepared with 1:2:4 mix ratio and 0.5 water-cement ratio. Fifteen beams of (900 x 150 x 300) mm size was prepared for each batch in standard fashion. Equal number of specimens were cured for 7-, 28-, and 90 days. All beams were tested under central point loading with gradually increasing load. Load and deflections were recorded at regular interval till failure. From recorded load flexural strength was computed. Results showed better performance of recycled aggregates from column concrete than other counter parts. Maximum deflection in all beams were well within allowable range by ACI318. Deflection performance of binary blended concrete was better than conventional concrete. Elongated curing showed improvement in flexural strength, but increase was less than 5%. In all specimen failure mode observed was flexural failure.