International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 378 Utilization of Waste Plastic as Partial Replacement of Fine and Coarse Aggregates in Concrete Blocks Dr. M Lokeshwari 1 , Nikunj Ostwal 2 , Nipun K H 2 , Prakhar Saxena 2 , Pracheer Pranay 2 1 Associate Professor Department of Civil Engineering RVCE, Bengaluru, India 2 U.G Student Department of Civil Engineering RVCE, Bengaluru, India ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - Plastic is generated in large quantities all over the world. It is believed that the breakdown of plastic takes time of more than thousand years. Improper plastic waste management leads to several environmental and health hazards. To overcome this problem recycled plastic aggregate (RPA) made using shredded plastic waste Polypropylene (PP) has been added by replacing it with various percentages (0- 20%) of both fine and coarse aggregates. Several tests including fresh state properties like workability and hardened state properties like compressive strength test, split tensile strength test and dry density test were performed on the partially replaced specimens of cubes (150mm X 150mm X 150mm) and cylinders (150mm X 300mm) after 3, 7 ,14 and 28 days of curing period. Later based on the results of properties of mixed concrete with plastic aggregates were examined and compared with the original control mix concrete with normal aggregates. Replacement of natural aggregates by recycled plastic aggregate (RPA) can be used as an alternative and sustainable approach towards environmental friendly construction practice. The use of plastic waste material as a substitution of variable percentage of fine and coarse aggregates (0-20%) designed for M-40 grade concrete although reduces the concrete properties namely the fresh and hardened state properties of the concrete but can be used for various lower grade strength applications such as precast bricks, partition wall, panel wall, canal lining and so on. Key Words: Concrete, Recycled Plastic Aggregate, Polypropylene, Shredded Plastic Waste, Fresh state Properties, Hardened state properties, Strength. 1. INTRODUCTION The world has created over 9 billion plenty of plastic since 1950. As of 2015 only 9% of the plastic waste was recycled, about 12% incinerated and about 79% ended up in landfills or some place in the environment (PlasticsEurope Market Research Group, 2018). Moreover about 180 billion plastic bottles were purchased in 2006 which raised to 480 billion after a decade (The Guardian, 2017). Only 7% of the waste plastic bottles turned into new bottles and the rest ended up in land fills or oceans. According to Ecowatch the usage of plastic bags worldwide annually lies between 500 billion to 1 trillion. A research by (National Geographic, 2018) states that there will be about 12 billion metric tonnes of plastic in landfills by 2050 if the plastic consumption increases at the current rate. Despite of limitations being imposed on the production and usage of plastic, post consumer plastic waste the problem is not yet solved. India in the present scenario discards 70% of its total plastic production as waste. It is estimated that 5.6million tonnes per annum (TPA) of plastic waste is generated in this country (Central Pollution Control Board, Delhi, 2013). The various types of plastic are Polyethylene Terephthalate (PET), High Density Polyethylene (HDPE), Polyvinyl Chloride (PVC), Low density Polyethylene (LDPE), Polypropylene (PP), Polystyrene (PS) etc. The waste plastics availability based on various types of plastic are 23% LDPE, 17.3% HDPE, 18.5% PP, 12.3% PS, 10.7% PVC, 8.5% PET and 9.7% of other types (Zoorob and Suparma, 2000). So many foraging cows in India have died from ingesting plastic bag litter that many of the states in the country have banned the distribution of plastic bag and the effect of plastic waste has a direct and a deadly effect on marine and wildlife after ingesting plastic or getting entangled in it. The availability of conventional fine aggregates i.e. river sand has become scarce and sand mining affects the riverbed characteristics increasing the cost of concrete. Polypropylene (PP) is one of the most widely used consumer plastic and has a wide range of applications like manufacturing of pipes, kettles, plastic containers, plastic bags, bottles, food containers, stationary folders, packaging, protective covers and storage boxes. PP being recyclable has a resin identification code of number “5”. Many researchers investigated the properties of waste plastic incorporated in structural concrete. It is possible to produce self compacting concrete having compressive strength in excess of 35MPa when the fine aggregates are partially replaced by PET plastic waste (Sheelan and Nahla.,2017). As the size of recycled PET particle is increased, the Young’s Modulus of specimen was decreased, and simultaneously the compression strain increases (Liliana et al., 2013). (Jalali et al., 2011) examined the durability characteristics of polymeric wastes in concrete (Tyre rubber and PET bottles). Furthermore, tests were also performed for w/c ratios ( 0.5 and 0.6 ), and it was indicated that the mixes with 10% replacement resulted to have the best mechanical properties, and the mixes with 20% replacement resulted to have lower compressive strength (Albano et al.,2009). (Ozbakkaloglu et al., 2017) performed tests on short term mechanical properties of concrete containing waste Polypropylene as a replacement of coarse aggregates under elevated and ambient conditions of