Alkali-activated cement composition

A cement composition, comprising:

• a curable component in an amount of 10 to 25 wt. % based on a total weight of the cement composition;
• wherein the curable component comprises a cementitious material, a limestone powder (LSP) material, a red mud (RM) material, a silicomanganese fume (SMF) material, and a natural pozzolan (NP) material;
• a fine aggregate (FA) comprising sand in an amount of 20 to 40 wt. % based on the total weight of the cement composition;
• a coarse aggregate (CA) comprising crushed limestone in an amount of 40 to 50 wt. % based on the total weight of the cement composition;
• an alkaline component in an amount of 5 to 15 wt. %, based on the total weight of the cement composition;
• wherein the alkaline component comprises an alkali metal hydroxide and an alkali silicate;
• wherein the cementitious material has an average particle size (D50) of 10 to 17 micrometers (μm);
• wherein the LSP material has a D50 of 13 to 19 μm;
• wherein the RM material has a D50 of 30 to 36 μm;
• wherein the SMF material has a D50 of 28 to 34 μm;
• wherein the NP material has a D50 of 13 to 19 μm;
• wherein particles of the cementitious material, the LSP material, and the NP material have angular, irregular, and flake-like shapes;
• and
• wherein particles of the RM material, and the SMF material have smooth surfaces and spherical shapes.