In one project example, the Guide to the Code Requirements for Evaluation, Repair, and Rehabilitation of Concrete Buildings describes a situation in which delamination and spalling occurred in a 1960s concrete parking structure.
The lower level was on the ground; the middle level and roof consisted of reinforced flat slabs with drop panels. The designer’s repair plan included replacing the top 3 to 4 inches of concrete in the damaged area and replacing corroded steel reinforcement with epoxy-coated reinforcing bars.
Throughout the example, the guide references ACI 562 provisions for structural evaluation, repair design, and the contractor’s responsibilities during construction, including:
Meeting specified limits for concrete removal;
- Notifying the licensed design professional if unsafe conditions exist;
- Installing temporary shoring or bracing; and
- Conforming to local environmental ordinances for water runoff and debris disposal.