High Early Cement.

High early cement does exactly what its name implies: it provides higher compressive strength at an earlier age. Although Type III or Type IIIA cement can produce high early strength, there are other ways to achieve the same end result:

• Add more cement to the mixture [600 Ib (272 kg) to 1000 Ib (454 kg)];
• Lower the water content (0.2 to 0.45) by weight;
• Raise the curing temperature after consultation with the design engineer;
• Introduce an admixture into the design mix;
• Introduce microsilica, also known as silica fume, to the design mix;
• Cure the cast-in-place concrete by autoclaving (steam curing);
• Provide insulation around the formed, cast-in-place concrete to retain heat of hydration.

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