EVALUATION OF RECYCLED CONCRETE AGGREGATE AND RICE HUSK ASH WITH POLYVINYL ALCOHOL FIBRE FOR MECHANICAL PROPERTIES OF CONCRETE

The present research work has been done to find the best suitable mix on addition and replacement with some other materials possessing similar physical properties as conventional concrete materials. The materials used in this study were Recycled Concrete Aggregates (RCA), Rice Husk Ash (RHA) and Polyvinyl Alcohol Fibre (PVA). Coarse aggregates were replaced with RCA in varied percentages like 0%, 25%, 50%, 75% and 100%, whereas cement was replaced fractionally as 5%, 10%, 15% and 20% with RHA by weight. PVA fibre has been added to a fixed percentage of 0.25% by weight of concrete. PVA fibre with geometric length of 6mm and aspect ratio of 428 was used. Different destructive and non-destructive testing had been done for 7 days and 28 days. Experiment had shown best results at 50% of RCA and 10% RHA with PVA fibre fulfilling the design requirements for the appliance in construction industry. Further it was seen for higher percentages of RCA and RHA, strength of the concrete start decreasing due to effect in pozzolanic properties of concrete.