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Interfacial Effects of Cathodic Protection on Alkali-Silica Reaction in Reinforced Concrete Beams

Reinforced concrete (RC) beams with 2 different water-cement ratios (0.35 and 0.53) were made with non-reactive river sand and reactive andesitic crushed stone. After 28 days of steam curing, RC beams were exposed to the outdoors, and a cathodic protection current of 50 mA/m-sq. was applied to the steel reinforcement in the beams. The expansion and cracking of the beams were monitored for 3 years to investigate whether or not the cathodic protection current may actually accelerate the alkali-silica reaction (ASR) around the steel cathode in the RC beam. After 3 years of exposure time, the flexural loading test was performed for ASR damaged RC beams with and without the cathodic protection. From experimental results, it was found that application of cathodic protection in RC beams increased significantly the risk of damaging expansion and cracking in the concrete containing alkali-reactive aggregates, resulting in a reduction of load bearing capacity of RC beams in the bending test. This indicates the importance of the survey relating to the alkali-reactivity of the aggregates used in concrete structures and the alkali content of concrete before the cathodic protection is applied.