中文摘要：

给砂浆试样施加三点载荷，测试砂浆内碳钢的腐蚀电位、腐蚀电流密度和阻抗等随着时间的变化；结合砂浆试样表面裂纹的分布，研究了载荷大小对砂浆内钢筋腐蚀的影响。结果表明，载荷对砂浆中碳钢腐蚀的影响可分为两个阶段，浸泡初期，载荷主要影响溶液在砂浆中的渗透过程；后一阶段载荷主要通过改变钢筋的应变状态而加速钢的腐蚀。随着时间的延长，溶液渗透到钢筋表面且引起钢筋腐蚀后，钢筋的腐蚀电位和腐蚀电流密度都趋于稳定并与载荷有关，载荷较高时钢筋的腐蚀电位较负、腐蚀电流密度较高。

英文摘要：

Three-point loads were applied to samples for studying the influence of stress on corrosion behaviour of carbon steel in motar. The corrosion potential, corrosion current density and electrochemical impedance spectroscopy （EIS） of carbon steel were studied. In addition, the cracks on mortar surface were observed. The results showed that the effects of stress on corrosion behaviour of carbon steel in motar could be divided into two stages. During the early immersion period, the stress mainly affected the permeation of solution. Furthermore, as the solution permeated to the steel surface and made the carbon steel begin to corrosion, the stress mainly affected the strain state, which accelerated the corrosion of carbon steel in motar. As immersion time increased, the corrosion potential and corrosion current density maintained a relatively stable state. Then the corrosion potential decreased and corrosion current density increased with the increase of load magnitude.