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Allow Proper Time to Water Cure. After concrete is placed, the concrete increases in strength very quickly for a period of 3-7 days. Concrete which is moist cured for 7 days is about 50% stronger than uncured concrete.Read about properly curing concrete slabs.Water curing can be done after the slab pour by building dams with soil around the house and flooding the slab.The enclosed area is continually flooded with water.oncrete which is moist cured for 7 days is about 50% stronger than uncured concrete. Read about properly curing concrete slabs. Water curing can be done after the slab pour by building dams with soil around the house and flooding the slab. The enclosed area is continually flooded with water.
Best Answer: Concrete's strength is normally expected to reach its design strength in 28 days if it has been cured properly. Curing properly involves keeping the concrete moistened with water for the duration of the curing period or by sealing the surface with a spray-on concrete cure and seal product.he full design loadings on the slab should be avoided for 28 days. The previous durations apply to normal and concrete placements as large as say 3 or 4' thick or more, mass concrete placements continue to cure for an extended period due to the heat of hydration and moisture content issues.