Concrete Block Hits Highway Builder A 30-foot (10-meter) high concrete retaining wall made of interlocking concrete blocks was already in place. Then workers began to install concrete caps on top of the wall. A seven-person crew went to work on the job, which was part of a highway bridge project. Suddenly a one-ton piece of pre-cast concrete, one of the cap pieces, broke loose as it was being hoisted to the top of the wall. A 51-year-old worker and his job superintendent were in a lift, still on the ground, waiting to be raised to grout and finish installing the cap after […]