Studies on partial replacement of HDPE and PP waste plastic for M30 and M40 grade concrete

In the present paper two different plastic materials High Density Polyethylene (HDPE) and Polypropylene (PP) was replaced with fine aggregate (FA) till 10% by 2.5% increment. Different test such as compressive strength (3, 7, 28 & 60 days) (150x150x150mm), flexural strength (3, 7, 28 & 60 days) (100x100x500mm), acid attack (28, 56 & 90 days)(100x100x100mm), sulphate attack (28, 56 & 90 days)(100x100x100mm), thermal conductivity (180mm dia x 20mm thick). The compressive strength of 40.52MPa and 38.41Mpa for PP and HDPE material was observed in M30 grade concrete respectively. Similarly, for M40 grade concrete 43.6MPa and 41.8MPa for PP and HDPE material respectively. The optimum percentage of 5% and 7.5 for PP and HDPE material respectively can be replaced in concrete for flexural strength for both M30 and M40 grade. The least percentage loss in acid attack was observed at 28 days for both HDPE and PP material but for 56days and 90 days the percentage loss of weight was significantly less (< 5%). The sulphate attack for both M30 and M40 grade concrete showed less than 10% percentage loss in weight till 90 days. Thermal conductivity (k) was also reduced by 30–35% for both HDPE and PP material till 10% replacement in concrete for M30 and M40 grade.