In order to study the influence of different water cement ratios and admixtures on the distribution of corrosion products at the initial stage of reinforcement corrosion,the corrosion ratio of reinforcement in different sections of different concrete specimens and the distribution of corrosion products near the reinforcement/concrete interface were observed by scanning electron microscope,and the porosity of each specimen was obtained by mercury intrusion test.The results show that under the same corrosion condition,the corrosion ratio of reinforcement increases with the increase of concrete porosity.The experimental observation at the initial stage of rebar corrosion also found that the corrosion products would gradually accumulate as a corrosion layer at the rebar/concrete interface,and some of the corrosion products would fill the pores of nearby mortar,based on which the transmission behavior of corrosion products in concrete was given;The corrosion layer on the steel surface is distributed randomly,which is difficult to describe by existing models.Only when the steel corrosion develops to a certain extent,it can be reasonably expressed by the previously proposed non-uniform distribution models.
water-cement ratioadmixturessteel corrosiondistribution of corrosion products
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