Curing Concrete, Chapter 12 - Memphis

Curing is the maintenance of a satisfactory moisture con-tent and temperature in concrete for a period of time imme-diately following placing and finishing so that the desiredproperties may develop (Fig. 12-1). The need for adequatecuring of concrete cannot be overemphasized. Curing has astrong influence on the properties of hardened concrete ;proper Curing will increase durability, strength , watertight-ness, abrasion resistance, volume stability, and resistance tofreezing and thawing and deicers. Exposed slab surfacesare especially sensitive to Curing as strength developmentand freeze-thaw resistance of the top surface of a slab canbe reduced significantly when Curing is portland cement is mixed with water, a chemicalreaction called hydration takes place. The extent to whichthis reaction is completed influences the strength and dura-bility of the concrete . Freshly mixed concrete normally con-tains more water than is required for hydration of the ce-ment; however, excessive loss of water by evaporation candelay or prevent adequate hydration.

face. Burlap sprayed with water is an effective method for moist curing. (69973) 60 50 40 30 20 10 0 0 7 28 90 365 8 6 4 2 0 Age at test, days Moist-cured entire time In air after 28 days moist curing In air after 7 days moist curing Compressive strength, MPa In laboratory air entire time Compressive strength, 1000 psi Fig. 12-2.

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  Tests, Methods, Concrete, Strength, Compressive, Compressive strength

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