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CSA cement becomes stronger and faster than OPC, and CSA cement shows very low shrinkage characteristics. This is partly due to two reasons. The first is that CSA needs 50% more water than Portland cement for proper hydration. The second reason is that the very rapid strength increase can prevent shrinkage cracks, because the strength of concrete grows faster than the shrinkage stress of concrete. CSA cement has strict minimum moisture requirements, so it cannot be ignored.
CSA cement curing is important, but the moisture curing time is usually in hours, rather than days or weeks. When the CSA cement concrete is kept wet for at least 3 to 4 hours after pouring, the best hydration and slab stability can be obtained. In the initial hydration stage, concrete needs moisture and reacts quickly to generate a lot of heat. If sufficient moisture is not provided during the curing process, it may crack and curl. When water is provided by stagnant water or repeated wetting during the first few critical hours, it can maintain and ensure long-term stability and strength.
CSA cement can and should be used directly as a 100% substitute for Portland cement. Since CSA does not react with pozzolan, it does not require any materials to obtain high-strength and eco-friendly concrete. This simplifies the hybrid design and minimizes inventory. Using pozzolan with CSA cement will actually weaken the concrete, so it is best not to use them at the same time.
