A crew uses the common quality-concrete rule of thumb that contraction-joint spacing in feet should be about 24 to 30 times slab thickness in inches. For a 5 in. slab, what range results?
Correct Answer
C) 10.0 to 12.5 ft
For a 5 in. slab, 24 x 5 = 120 in. = 10.0 ft and 30 x 5 = 150 in. = 12.5 ft, so the range is 10.0 to 12.5 ft. Other choices use too small or too large a thickness multiplier.
Why This Is the Correct Answer
For a 5 in. slab, 24 x 5 = 120 in. = 10.0 ft and 30 x 5 = 150 in. = 12.5 ft, so the range is 10.0 to 12.5 ft. Other choices use too small or too large a thickness multiplier.
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