Studies on Mechanical Properties of Ternary Blended Self Compacting Concrete using Different Percentages of Recycled Aggregate

Concrete is the most widely used construction material. Inadequate compaction of concrete results in large number of voids, concrete pouring and compaction on structural element with dense reinforcement and beam column joint are difficult. Self compacting concrete (SCC) is new type of concrete that has flow ability, filling ability, passing ability and stability. Coarse aggregate is one of these factors that have a significant influence on SCC. The use of recycled coarse aggregate (RCA) in any concrete is an effort of recycle waste and new development in environmental friendly concrete. Ternary blended concrete (TBC) improves strength, durability and also it is eco friendly in nature. In this research ternary blended SCC of 50 grades is designed by replacing natural coarse aggregate with recycled aggregate from roof slab of 25years old. The % replacements are 0, 25, 50, 75 and 100. Also, the cement is partially replaced with 10% Metakaolin by weight of binder. Super-plasticizer is added at a dosage of 1.0%, by cement weight, to achieve the flow characteristic of SCC. The mix that has the large slump flow is tested with V-funnel and L-box and the results are presented. Further the compressive strength, split tensile strength and flexural strength are conducted at the age of 7days, 28days and 56days for SCC 50 grade of concrete. The results indicated that the compressive strength of 25% and 50% replaced recycled aggregate Self compacting concrete is nearly equal to natural aggregate Self Compacting Concrete at 7, 28, 56 days age of concrete. The split tensile and flexural strength of 25% replaced recycled aggregate Self compacting concrete is nearly equal to Natural aggregate Self Compacting Concrete at respective age of concrete. At all ages Flexural strength shown decrease in trend with the increase in replacement of recycled aggregate. From the research work keeping economy, eco-friendliness and compressive strength in point of view convectional aggregate can be replaced with recycle aggregate concrete by 50% in ternary blended self compacting concrete.