Siswanto, Roby, Hernu Suyoso, & Gati Annisa Hayu. "THE EFFECT OF THE USE OF BEACH SAND AS FINE AGGREGATE AND SHELLS AS CEMENT PARTIAL SUBTITUTION TOWARDS COMPRESSIVE STRENGTH OF CONCRETE." Jurnal Rekayasa Sipil dan Lingkungan [Online], 1.02 (2017): 192-199. Web. 24 Nov. 2024