This report includes three chapters. The first chapter discusses the corrosion of steel in concrete and provides information on the half-cell corrosion detection technique. In the second chapter, WSDOT's use of the test is reviewed, its concerns with the test are discussed, and reliability of data collected is determined based on the field tests conducted. In the third chapter, a systematic procedure is developed with which to incorporate half-cell data into the WSDOT's bridge deck repair priority and protective system selection program.
The findings of this report support the use of the half-cell test on bridge decks for classifying their overall condition. The use of half-cell data for designating specific bridge deck areas needing repair, however, it is not recommended. The criteria presented in ASTM for evaluating the significance of half-cell potentials can be used for interpretation of data at this time. However, the empirical criteria may be modified in the presence of more data.