., R., W Alisjahbana, S., Riyanto, H., Hasyim, C., Ikhsan Setiawan, M., Harmanto, D., & Barid Nizarudin Wajdi, M. (2018). Substitution Local Resources Basalt Stone Scoria Lampung, Indonesia, as a Third Raw Material Aggregate to Increase The Quality of Portland Composite Cement (PCC). International Journal of Engineering and Technology, 7(2), 484-490. https://doi.org/10.14419/ijet.v7i2.11252