The casting should be
planned so that the work on a member can be completed before the end of the
day. If cast concrete is left for more than 2 hours it will set so much that
there is no direct continuation between the old and new concrete. Joints are potentially
weak and should be planned where they will effect the strength of the member as
little as possible. Joints should be straight, either vertical or horizontal.
When resuming work, the old surface should be roughened and cleaned and then
treated with a thick mixture of water and cement.
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