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<br /> <br />Exhibit 29. Reinforcing steel in concrete may corrode when <br />exposed to water due to spa11ing or cracking. <br /> <br />If the steel corrodes, the corrosion products expand and may cause spa.11ing of <br />the concrete. Corrosion can also take place in the concrete itself. It is <br />not, however, the same type of electrochemical reaction that occurs in metal. <br />Other reactions between the concrete materials and the chemicals present in <br />the stream flow or ground water are involved and can result in deterioration <br />of the concrete, as shown in exhibit 30. <br /> <br />40 <br />