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INTERNATIONAL JOURNAL OF INFORMATION AND COMPUTING SCIENC ISSN NO: 0972-1347 three samples of plastic replaced concrete were casted and tested and average of three are taken for the accuracy of results. The results of unit weight of control and plastic replaced concrete are shown in Table 5. In order to compare the effect of plastics with normal aggregates, the percentage reduction in the unit weight of concrete achieved by using plastics as aggregates is found and is presented in Table 5. It can be seen from the Table that with the use of plastics, the dry density is reduced for all mixes, at 0.50 water-cement ratio. The density is reduced for all the mixes. COMPRESSIVE STRENGTH The compressive strength test results for controlled concrete and different trial mixes were shown in Table 5. The tests were carried out as per IS: 516-1959. The 150mm cubes of various concrete mixtures were cast to test compressive strength.The bar charts of compressive strength results for 7,21and 28 days are presented in Fig 2 also the dry density for various trial mixes are indicated in Fig 3. Table 5. Compressive strength and Density test results of various Mix proportions HDPE replacement levels Controlled Mix MIX 1 MIX 2 MIX 3 MIX 4 7 DAYS 21 DAYS Density kg/m3 28 DAYS 21.66 2366 23.67 2342 22.12 2301 19.56 2296 17.78 2290 Compressive strength N/mm2 16.4 18.47 17.88 19.56 17.49 18.98 13.67 15.78 10.54 14.1 Volume 5, Issue 7, July 2018 106 http://ijics.com/PDF Image | Plastics Pipe Institute Handbook of Polyethylene Pipe
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