Answer Posted / tanmay

For columns, walls, vertical form works : 16-24 hrs
Soffit formwork to slabs : 3 days (props to be refixed after removal)
Soffit to beams props : 7 days props to refix after removal.
Spanning up to 4.50m : 7 days
Spanning over 4.50m : 14 days
Staircase : 5 days
Footing : 16-24 hours

Sometimes the side of concrete bridges is observed to turn black in color. What is the reason for this phenomenon?

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a butt weld is specified by

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