Application of CNC Waste with Recycled Aggregate in Concrete Mix

In this Era of globalization when GDP of most of the countries are spending on an average 8% of the economy on infrastructure and when we see around us about the term infrastructure mostly we see the huge contribution of concrete in it; in addition to this three important terms are named as “Quality, Quantity and Economy”. There is a deadly race among the nations of various parts of the globe that each one is on the verge of attaining an economic aspect of having efficient quality that enhances our rapid and sustainable growth; but most importantly the construction should comprise of using waste product which are posing a greater threat to the environment. When we look at the past many researchers during their research work have come across many benefits and barriers. In their research when the constituents of normal concrete were altered with the CNC waste (waste obtained by Computer Numeric Controlled Lathe Machine waste) and the Recycled aggregate as a substitute for the natural coarse aggregate then remarkable results were seen. In this modern world when the unbelievable demand of steel is on its peak, this nature of blindly following the growth strategy not only leads toward urbanization but it heads towards a dumping ground of Industrial Waste as well. For harnessing this large quantity of steel the CNC Lathe Machines are used and due to their usage a large amount of waste is produced. As the raw materials obtained from the demolition activity takes place such as, building roads, bridges and fly over, subway, remoulding cylinder and block etc. Dumping of raw material has become a problem for many countries. Construction industry in India generates around 10-20 million tonnes of waste annually. Recycled coarse aggregates are used to replace natural coarse aggregates as RCA are posing a greater threat for disposal. In addition to that when we think to make economical and eco-friendly concrete then use of RCA plays an important role. The main aim for this project is to determine the strength characteristic of CNC waste with Recycled aggregates in concrete mix. The scope of this project is to determine and compare strength of concrete by using different percentage of CNC with recycled aggregates. several tests are performed on the different material like aggregate, sand, cement and recycled aggregate as per the IS specification. The investigations were carried out using workability test, compressive strength test and bulk density, water absorption, impact value test, crushing value test, fineness modulus. There were total four batches of concrete mixes, consisting replacement of Natural coarse aggregates with 30%, 50% and 100% RCA in addition with 1% and 2% of CNC waste. Mix design is done with IS 10263-1999 (Revised) in which water cement ratio was taken as 0.5. For the strength of characteristics, the results showed that a gradual increase in the compressive strength up to 50% of recycled aggregate with 2% CNC waste.