We were asked by a concrete contractor to add calcium chloride to the concrete we supplied but not show it on the batch ticket. We refused and lost the order. Are there producers who will supply concrete this way?
There may be, but there shouldn't be. Specifications often prohibit the use of chlorides in cast-in-place concretes containing reinforcing steel, placed on metal decking, or having dissimilar metals embedded in them. By not showing that calcium chloride was added, you'd be helping a contractor knowingly violate such specification requirements. We can think of no legitimate reason for failing to show all of the concrete ingredients on the batch tickets.