A standard four-inch concrete slab undergoes two distinct phases: initial setting and structural curing. The concrete will typically harden enough to walk on and support light foot traffic within twenty-four to forty-eight hours after pouring, depending heavily on ambient temperature, humidity, and the specific mix design used. However, "hardening" through surface drying is very different from achieving full structural strength, which is a chemical process called hydration. Concrete reaches approximately seventy percent of its ultimate compressive strength within seven days and achieves its full rated structural design strength after twenty-eight days. During this curing window, keeping the concrete moist by spraying it with water or covering it with plastic prevents premature drying and ensures maximum durability.
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