Kushartomo, W., H. Wiyanto, and D. Christianto. “INCREASING THE CALCIUM SILICATE HYDRATE AMOUNT IN REACTIVE POWDER CONCRETE USING MARBLE POWDER”. Spektra: Jurnal Fisika Dan Aplikasinya, Vol. 6, no. 1, Apr. 2021, pp. 25 -36, doi:10.21009/SPEKTRA.061.04.