Q.: In construction joints that are actually control joints isn't it possible to place steel so that it will stop any movement of the concrete?

A.: In construction joints that are designed to function as control joints it is common to use smooth dowel bars which are coated on one end to prevent bond and thus permit movement while keeping the slabs aligned. Where construction joints are not required to function as control joints, deformed tie bars can be used across the joint to hold the two sides tightly together.