curing of concrete why 7day's,14day's 21day's 28days
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After concrete is placed, a satisfactory moisture content
and temperature (between 50°F and 75°F) must be maintained,
a process called curing. Adequate curing is vital to
quality concrete.
Curing has a strong influence on the properties of hardened
concrete such as durability, strength, watertightness,
abrasion resistance, volume stability, and resistance to
freezing and thawing and deicer salts. Exposed slab
surfaces are especially sensitive to curing. Surface
strength development can be reduced significantly when
curing is defective.
Curing the concrete aids the chemical reaction called
hydration. Most freshly mixed concrete contains
considerably more water than is required for complete
hydration of the cement; however, any appreciable loss of
water by evaporation or otherwise will delay or prevent
hydration. If temperatures are favorable, hydration is
relatively rapid the first few days after concrete is
placed; retaining water during this period is important.
Good curing means evaporation should be prevented or
reduced.
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