Global Journal of Science Frontier Research, H: Environment & Earth Science, Volume 21 Issue 6

daily by human. Efforts are geared towards the adoption of plastic waste as alternative materials in construction industry. Hence, the study focused on recycling plastic PET as partial replacement for fine aggregate in concrete matrix. Boucedra et al. (2020) conducted an experimental study on concrete containing plastic wastes as aggregate. The plastic waste was substituted for fine aggregate at 25%, 50% and 75% replacement levels. Their findings showed reduction in density of concrete as the contents of plastic waste aggregate in the concrete increases. Nevertheless, replacement levels of up to 50% gave density that falls within the range of lightweight concrete. Similarly, behaviour of concrete with addition of plastic waste aggregate at 25%, 50% and 75% replacement levels were studied by Belmokaddem et al. (2020). Their study results indicated that the content of plastic aggregate is inversely proportional to the density of concrete. The higher the contents of plastic aggregate, the lower the density of concrete. Almeshal et al. (2020) incorporated plastic waste aggregate in concrete matrix in dosage of 10%, 20%, 30%, 40% and 50% replacement of fine aggregate. Results revealed slight reduction in compressive strength for 10% and 20% incorporation of plastic waste aggregate, compare to control mix. Beyond that, the reduction in strength became significant. Over 30% reduction in compressive strength when 40% plastic waste aggregate was incorporated in concrete mix. The decreasing trend was attributed to the reduction in composite bulk density. Effect of 5, 10 and 20% of plastic waste aggregate in concrete matrix was experimentally studied. The plastic aggregate was added as replacement for sand. Compare to the control concrete, it was observed that the compressive strength reduces by 7, 12 and 24% for concrete containing 5, 10 and 20% plastic aggregate respectively. The reduction trend was explained to be as a result of lower compressive strength of plastic aggregate compare to sand (Mustafa et al., 2019). Needhidasan et al. (2020) used plastics from electronic materials (E-plastic) as replacement for conventional coarse aggregate in concrete mix. It was found out that, up to 22% of E- plastic waste can be incorporated into concrete mix with minimal reduction in compressive strength. At 28 days, the target strength of 40MPa was achieved for concrete with 22% E-plastic waste. Experimental investigation of the properties of concrete with PP and LDPE plastic waste. The results revealed that the presence of plastic waste in concrete reduced the flexural strength of concrete mix of all replacement levels. Meanwhile, concrete with PP plastic waste showed better flexural strength performance than LDPE aggregate concrete. This can be explained to be due to the higher tensile strength of PP plastic aggregate over LDPE plastic aggregate. Concrete mix with 5% of PP as replacement for fine aggregates indicated 18% variation to the control concrete. However, concrete with incorporation of 5% and 10% PP plastic waste and 5% LDPE plastic waste gave considerable variation of 18%, 38% and 41% to conventional mix respectively. It was observed that there is decreasing trend of flexural strength as the contents of plastic waste increase and decrease in fine aggregate contents (v Visweswara Sastry Dhara&kumar, 2018). II. M aterials and M ethods All materials used for the study are sourced locally. The materials comprise of cement, fine aggregate (sand), coarse aggregate, plastic waste PET and water. The cement used for producing the concrete samples was Ordinary Portland Cement (O.P.C). Dangote cement brands of 42.3R grade and which conform to NIS 444-1:2003 based on the NIS trademark on the bag was procured. The cement was purchased from a retail shop at Oke-odo, Tanke, Ilorin. River sandwas used as fine aggregates and which can be regarded as sharp sand based on visual examination. Crushed aggregate or granite was used as coarse aggregate. Both fine and coarse aggregates were sourced from a construction site in the University. Precautions were taken that the aggregates did not have impurities such as grass, waste materials among others. Both fine and coarse aggregates conform to BS 822.Plastic waste of Polyethylene Terephthalate (PET) bottles was bought in packs from a local vendor at Tanke, Ilorin. After procurement, all materials were transported to the laboratory for further test before use in concrete. The water that conforms to WHO standards was sourced from the laboratory. a) Preparation of Plastic Waste PET as Coarse Aggregate The preparation of the PET coarse aggregates follows several steps. Firstly, the PET bottles were fragmented into small pieces or flakes, then it was washed thoroughly with detergent and water to remove any impurities. The PET bottles flakes were poured in a pan and heated at a temperature of 15 o c/min up to 250 o c using cooking gas. The PET flakes were continuously stirred to ensure uniform melting of the plastics. Then, it was transferred to the moulds and allowed to cool and solidify into a boulder form. The plastic waste PET in its boulder form was crushed to obtain desired plastic waste PET coarse aggregate with maximum size of 25 mm. The acquired plastic waste PET coarse aggregates were round in shape and had smooth surface texture. The physical properties of the materials such as particle size distribution, specific gravity and aggregate impact value were carried out in accordance with BS EN 933-1, 2012; BS EN 1097-2, 2020; BS EN 1097-3, 1998respectively. Experimental Study on Effect of Plastic Waste as Coarse Aggregate on Concrete Properties © 2021 Global Journals 1 Global Journal of Science Frontier Research Volume XXI Issue VI Year 2021 44 ( H ) Version I b) Mix proportion Conventional mix ratio of 1:2:4 (cement: fine aggregate: coarse aggregate) was employed for the