Influence of Volume of Paste on Fresh and Hardened Properties of Self Compacting Concrete Using Recycled Aggregates

Abstract

Influence Of Volume Of Paste On Fresh And Hardened Properties Of Self Compacting Concrete Using Recycled Aggregates  Construction and Demolition waste management issues have attracted researchers around the world. The boom in construction sector and large-scale mechanization in concrete production has led to setting up of several ready-mixed-concrete (RMC) plants. The present study aimed at producing fine and coarse aggregates from the hardened concrete waste available at the RMC plant on the outskirts of Bangalore. The material characterization for both fine and coarse aggregates was carried out as per IS: 2386 (Part IV) – 1963. The test results have shown that the properties of recycled aggregates satisfy the codal provisions specified for natural aggregates.

The M-20 self compacting concrete mix with 0%, 25%, 50%, 75% and 100% replacement of fine and coarse aggregates were done separately in two batches. Third batch mixes consists of both fine and coarse aggregates replacement of 0%, 25%, 50%, 75% and 100%. Further the fresh and hardened properties of M-20 self compacting concrete mix has been carried out systematically. It was observed that 50% replacements in all the three batches of M-20 concrete mix have exhibited satisfactory flow and compressive strength values.

Conclusion

The conclusions that have been arrived at from this experimental study on SCC wherein the paste contents have been chosen as primary variables with the use of RCA can be summarized as follows: The design method based on absolute volume concept starting with paste content is a unique approach and can be successfully employed for achieving SCC. The method is simple and reduces the number of trials.