Tonapa, Suryanti Rapang, Desi Sandy, and Lisa Febriani. 2017. “EXPERIMENTAL STUDY OF POROUS CONCRETE WITH VARIOUS ADDITON OF RICE HUSK ASH”. IJRDO - Journal of Mechanical And Civil Engineering 3 (11), 07-14. https://doi.org/10.53555/mce.v3i11.1461.