“ The Effect of PET Coarse Aggregate Substitution on the 7-Day Normal Compressive Strength of Concrete: Evaluation of the Effect of PET Percentage Variation on the 7-Day Normal Compressive Strength of Concrete”. 2026. Journal of Research and Inovation in Civil Engineering As Applied Science (RIGID) 5 (1): 29-36. https://doi.org/10.58466/mvffq463.