A method of forming a cement composition, comprising: adding to a hydraulic cementitious material a first strength-enhancing agent and a second strength-enhancing agent, wherein: the content of total alkali (Na 2 O equivalent) in the hydraulic cementitious material is less than or equal to 0.7% by weight of the cementitious material; the first strength-enhancing agent includes a compound represented by structural formula: wherein: each R 1, R 2, R 3, and R 4, independently is a -(C 1 -C 4)alkyl-OH, and R 0 is a (C 1 -C 4) alkylene; and the first strength-enhancing agent is added in an amount of from 0.0005% to 0.20 % by weight of the hydraulic cementitious material; the first strength-enhancing agent includes tetrahydroxyethylethylenediamine (THEED); the second strength-enhancing agent is sodium sulfate; and the second strength-enhancing agent is added in an amount of 0.05 - 0.30 percent Na 2 O equivalent by weight of the hydraulic cementitious material; and preferably wherein the second strength-enhancing agent is added in an amount of 0.15 - 0.30 percent Na 2 O equivalent by weight of the hydraulic cementitious material; and preferably wherein the first strength-enhancing agent is added in an amount of 0.0005% to 0.04% by weight of the hydraulic cementitious material. wherein: the content of total alkali (Na 2 O equivalent) in the hydraulic cementitious material is less than or equal to 0.7% by weight of the cementitious material; the first strength-enhancing agent includes a compound represented by structural formula: the content of total alkali (Na 2 O equivalent) in the hydraulic cementitious material is less than or equal to 0.7% by weight of the cementitious material; the first strength-enhancing agent includes a compound represented by structural formula: wherein: each R 1, R 2, R 3, and R 4, independently is a -(C 1 -C 4)alkyl-OH, and R 0 is a (C 1 -C 4) alkylene; and the first strength-enhancing agent is added in an amount of from 0.0005% to 0.20 % by weight of the hydraulic cementitious material; the first strength-enhancing agent includes tetrahydroxyethylethylenediamine (THEED); the second strength-enhancing agent is sodium sulfate; and the second strength-enhancing agent is added in an amount of 0.05 - 0.30 percent Na 2 O equivalent by weight of the hydraulic cementitious material; and preferably wherein the second strength-enhancing agent is added in an amount of 0.15 - 0.30 percent Na 2 O equivalent by weight of the hydraulic cementitious material; and preferably wherein the first strength-enhancing agent is added in an amount of 0.0005% to 0.04% by weight of the hydraulic cementitious material. each R 1, R 2, R 3, and R 4, independently is a -(C 1 -C 4)alkyl-OH, and R 0 is a (C 1 -C 4) alkylene; and the first strength-enhancing agent is added in an amount of from 0.0005% to 0.20 % by weight of the hydraulic cementitious material; the first strength-enhancing agent includes tetrahydroxyethylethylenediamine (THEED); the second strength-enhancing agent is sodium sulfate; and the second strength-enhancing agent is added in an amount of 0.05 - 0.30 percent Na 2 O equivalent by weight of the hydraulic cementitious material; and preferably wherein the second strength-enhancing agent is added in an amount of 0.15 - 0.30 percent Na 2 O equivalent by weight of the hydraulic cementitious material; and preferably wherein the first strength-enhancing agent is added in an amount of 0.0005% to 0.04% by weight of the hydraulic cementitious material.