Site Investigation of Reinforcement Placement on Buildings and Bridges

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Title: Site Investigation of Reinforcement Placement on Buildings and Bridges

Author(s): Marton Marosszeky and Michael Chew

Publication: Concrete International

Volume: 12

Issue: 4

Appears on pages(s): 59-70

Keywords: bridges (structures); buildings; concrete durability; corrosion; cover; placing; quality control; reinforcing steels; spalling; Construction

Date: 4/1/1990

Abstract:
After determining that most durability failures are a result of inadequate concrete cover to reinforcement, cover was measured on 16 projects during construction. Of more than 10,000 readings, the cover was found to be less than specified in 63 percent of the cases. A detailed study of the factors that influence tolerance in steel placement was then made on seven other sites. The influence of aspects of design, construction, manufacture, management, and site work were evaluated to obtain a better understanding of current practice. The project's goal was to provide information for realistically specifying tolerance in construction, and to provide clients, designers, and site managers with the information necessary to practice effective quality control.