DURCON is a prototype expert system being developed to give recommendations on the selection of constituents for durable concrete. Four major concrete deterioration problems are being covered by DURCON: corrosion of reinforcing steel, freeze-thaw, sulfate attack, and cement-aggregate reactions. In this report, the portion of DURCON dealing with corrosion of reinforcing steel is discussed. The factual knowledge based for DURCON is based on the American Concrete Institute Guide to Durable Concrete. Heuristic knowledge is being obtained from experts on the durability of concrete. The approach taken in developing DURCON is discussed. Then a model expert system for the corrosion of reinforcing steel is described.

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