Alkali-activated cement composition

3:

• The cement composition of claim 1, wherein the cementitious material comprises at least one selected from the group consisting of portland cement, pozzolan cement, gypsum cement, aluminous cement, silica cement, and alkaline cement.

4:

• The cement composition of claim 1, wherein the cementitious material is type I ordinary portland cement (OPC).

5:

• The cement composition of claim 1, wherein the cementitious material comprises 81 to 88 wt. % CaO, 3 to 9 wt. % SiO2, 0.5 to 2 wt. % Al2O3, 2.5 to 9 wt. % FeO, 0.1 to 0.3 wt. % K2O, 0.2 to 0.8 wt. % MgO, each wt. % based on a total weight of the cementitious material.

6:

• The cement composition of claim 1, wherein the LSP material comprises 80 to 86 wt. % CaO, 8 to 15 wt. % SiO2, 1 to 4 wt. % Al2O3, 0.5 to 2.5 wt. % FeO, each wt. % based on a total weight of the LSP material.

7:

• The cement composition of claim 1, wherein the NP material comprises 10 to 17 wt. % CaO, 33 to 40 wt. % SiO2, 7 to 13 wt. % Al2O3, 25 to 33 wt. % FeO, 0.5 to 1.5 wt. % K2O, 2 to 7 wt. % MgO, 1 to 3 wt. % TiO2, each wt. % based on a total weight of the NP material.

8:

• The cement composition of claim 1, wherein the RM material comprises 2 to 7 wt. % CaO, 7 to 13 wt. % SiO2, 11 to 17 wt. % Al2O3, 50 to 58 wt. % FeO, 8 to 16 wt. % Na2O, 2 to 10 wt. % MgO, 1 to 7 wt. % TiO2, each wt. % based on a total weight of the RM material.

9:

• The cement composition of claim 1, wherein the SMF material comprises 1 to 5 wt. % CaO, 10 to 18 wt. % SiO2, 70 to 80 wt. % MnO, 1 to 7 wt. % FeO, 0.05 to 0.2 wt. % K2O, 1 to 5 wt. % MgO, each wt. % based on a total weight of the SMF material.

10:

• The cement composition of claim 1, wherein the FA comprises sand having a specific gravity of 2.6 to 2.7, and wherein the CA comprises limestone having a specific gravity of 2.5 to 2.6.

11:

• The cement composition of claim 1, wherein the alkali metal hydroxide is sodium hydroxide (NaOH), and the alkali silicate is sodium silicate (Na2SiO3), and wherein a weight ratio of the NaOH to the Na2SiO3 is in a range of 1:1 to 1:4.

13:

• The method of claim 12, wherein the cured specimen has a compressive strength of 10 to 50 MPa as determined by ASTM C39.

14:

• The method of claim 12, wherein the cured specimen has a modulus of elasticity of 5 to 20 GPa as determined by ASTM C469.

15:

• The method of claim 12, wherein the cured specimen has a split tensile strength of 1 to 4 MPa as determined by ASTM C496.

16:

• The method of claim 12, wherein the cured specimen has a drying shrinkage of 90 to 650 microstrains as determined by ASTM C596.

17:

• The method of claim 12, wherein the cured specimen has a residual strength of 10 to 35 MPa after an acid attack as determined by ASTM C1898;

18:

• The method of claim 12, wherein the cured specimen has a residual strength of 5 to 40 MPa after a sulfate attack as determined by ASTM C1012;

19:

• The method of claim 12, wherein the cured specimen has a non-steady state chloride migration coefficient (Dnssm) in a range of 17.5 to 29.6×10−12 m2/s as determined by ASTM C1202.

20:

• The method of claim 12, wherein the cured specimen has a chloride diffusion coefficient (Da) in a range of 53×10−12 to 17.6×10−12 m2/s for the free chloride and from 35.1×10−12 to 7.8×10−12 m2/s for the total chloride as determined by ASTM C1152 and C1156.