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Effect of cyclic loading on chloride diffusivity and mechanical properties of reinforced concrete beams corroded by seawater

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Document pages: 15 pages

Abstract: The effects of cyclic loading on the mechanical properties and chloride ion diffusivity of reinforced concrete beams under dry wet cycling of seawater were studied. In order to cause the initial damage of RC beam specimens, the cyclic load controlled by the maximum load and the number of cycles is applied. Then, the beam sample was subjected to 240 dry wet cycles in seawater. The results show that the chloride content increases with the increase of maximum load and cycle times. The chloride content on the steel surface increases approximately linearly with the increase of average crack width. In addition, the effect of maximum load on chlorine content on steel surface is greater than that of cyclic load. In the uncracked position, there is little difference in the average chloride diffusion coefficient between tensile concrete and compressive concrete. Average chlorine diffusion coefficientnt increased as crack width increased when crack width was less than 0.11 mm whereas the increasing tendency was weak when crack width exceeded 0.11 mm. The residual yield load and ultimate load of RC beams decreased as max load and cycle increased. Based on univariate analysis of variance, the max load had more adverse effect on yield load and ultimate load than cycle.

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