B. Vibratory truss screeds C. Vibratory manual screeds D. Metal floats. B. Vibratory truss screeds. To support heavy paving equipment, paving forms are built of steel up to _____. A. 1/4" thick B. 3/8" thick C. 1/2" thick D. 5/8" thick. A. 1/4" thick. Once concrete is placed, curbing forms are removed after _____. A. 8 hours
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