Corrosion damage of reinforced concrete (RC) structures is a serious problem responsible for billions of dollars in repairs of highway structures every year. Corrosion of reinforcing steel in RC affects structural performance in two different ways: by loss of steel section and through deterioration of steel-concrete bond. This experiment investigated the effects of corrosion products on bond strength. To test the strength of corroded reinforcing bar anchorages and to quantify the effect of deterioration of the bar surface on development length, RC slabs were cast with the ends of the reinforcing bars anchored in the concrete for a known length. Bond breakers were used over the center portion of the bars to control the force demand input to the test anchorage. This measure also served to protect those regions from corrosion. The anchorage zones were corroded to various degrees by applying electrical voltage to the bar ends. Specimens were tested in flexure to assess strength and mode of failure. Results were summarized by means of simple parametric design expressions that relate bond strength to steel area loss.
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