Page 36 - Masonry and Concrete
P. 36
Understanding Concrete
35
UNDERSTANDING CONCRETE
properly. Concrete that is not kept moist reaches only about 50% of its
design strength. Figure 2-19 shows the differences in concrete strength
for various periods of moist curing. If it is kept moist for at least three
days, it will reach about 80% of its design strength, and for seven days,
100% of its design strength. If the concrete is kept moist for the full 28-
day curing period, it will reach more than 125% of its design strength.
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