中文摘要：

研究了碳化混凝土再碱化过程中钢筋在Ca（OH）2溶液中的电极表面电化学反应，采用电化学测量技术结合模拟试验考察了电极表面发生各类反应的可能性。结果表明：再碱化过程中，钢筋电极表面的电化学反应与钢筋表面的状态有密切关系，当电极表面存在锈蚀层时，再碱化过程析氢反应和氧化铁的还原同时发生，并使表面氧化层的价态逐渐降低，在电极表面形成金属铁，析氢过程产生的OH^-使钢筋周围混凝土的碱性提高。

英文摘要：

The electrochemical reactions on the rebar during realkalization treatment of carbonated concrete were investigated by using simulation test and electrochemical t. The coulomb and the volume of H2 were measured during realkalization treatment, and the electrochemical characteristics of the rebar electrode before and after treatment were compared. The electrode process during the realkalization treatment was discussed according to the experimental results. Results show that the electrochemical reaction on the rebar is closely related with the surface state of rebar electrode. During realkalization treatment, the reduction of ferric oxide or ferrous oxide formed on the surface of rebar will occur in company with the H2 evolution. The realkalization treatment not only resumes the basicity of the carbonated concrete, but also rehabilitates the corroded rebar by reducing the rust to iron.