Utomo, Sudrajat, and Agung Sumarno. 2021. “The Effect of Additional Crystalline Materials on Concrete on Sulfic Acid”. IJIEEB International Journal of Integrated Education, Engineering and Business EISSN 2615-1596 PISSN 2615-2312 4 (1), 21-31. https://doi.org/10.29138/ijieeb.v4i2.1349.