This research paper investigated the potential use of low-density polyethylene (LDPE) plastic bags as a partial replacement for coarse aggregates in concrete. This study aimed to reduce waste plastic accumulation in the environment by utilizing it practically and sustainably as a construction material. The compressive, flexural, and split tensile strength tests were conducted on cylindrical and beam concrete specimens with different concentrations of low-density polyethylene coarse aggregates (LDPECA) (10%, 20%, and 30%). The test results show that the compressive strength of concrete decreased with an increasing percentage of LDPECA, indicating that it has a negative impact on the strength of concrete. The split tensile strength also decreased with an increasing percentage of LDPECA, but the flexural strength increased with an increasing percentage of LDPECA. In the study, it was shown that LDPE plastic bags as a partial replacement of coarse aggregate in concrete has promising results, but further investigations and experiments are necessary to fully understand the proper application of LDPECA. Further studies could use lower percentages of LDPECA and use admixtures to account for the loss of compressive strength. It may be possible to reduce the amount of plastic waste that builds up in the environment by adding LDPE plastic waste material to concrete. This may also encourage the use of more environmentally friendly materials for construction.