Santosa , Bing, Arusmalem Ginting, Prasetya Adi, and Eliada Obed Manasye. 2023. “Effect of Partial Replacement of Cement With Coconut Shell Ash on Concrete Performance”. Jurnal Teknik Sipil 19 (2):278 -. https://doi.org/10.28932/jts.v19i2.5286.