Dry concrete for moisture-sensitive floorcoverings

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There are two major sources of moisture in fresh concrete—excess mixing water left over after hydration of cement, along with natural groundwater beneath the concrete that moves to the surface by capillary action. This article describes how to control the sources of moisture in concrete slabs, minimize drying wait time to meet floorcovering manufacturer’s requirements, and determine when the slab meets those requirements.

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Taking a new approach to concrete

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In 2006, the Strategic Development Council of the ACI Foundation (established by the American Concrete Institute) recognized the need to set minimum requirements for strength, serviceability, and durability for existing structures.

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Specifying and achieving a level composite steel floor

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Composite steel assemblies are an efficient and popular structural option for floor construction. Figure 1 shows a typical assembly, consisting of a steel beam, metal deck, concrete slab, and shear connectors. The composite action between the steel beam and concrete provided by shear connectors creates the composite properties that make the system a very stiff and strong structural element.

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