钢筋在碱激发矿渣砂浆中的早期腐蚀行为

研究了模拟海水干湿循环过程中海水拌和碱激发矿渣(SAAS)砂浆、自来水拌和碱激发矿渣(TAAS)砂浆及矿渣水泥复合(CS)砂浆的强度变化.同时,通过腐蚀电位、线性极化电阻、电化学阻抗谱法研究了低碳钢筋(LC)和低合金耐蚀钢筋(LA)在上述3种砂浆中的早期腐蚀行为.结果表明:模拟海水干湿循环过程中,SAAS砂浆表现出较CS砂浆更高的强度保证;SAAS砂浆中钢筋早期腐蚀行为与TAAS砂浆无明显区别;钢筋在SAAS砂浆及CS砂浆中的极化电阻及电荷转移电阻在6个月的干湿循环过程中整体呈上升趋势,表现出较低的腐蚀程度.

Early Corrosion Behavior of Rebars Embedded in the Alkali Activated Slag Mortar

Mechanical strength development of three types of mortars(sea water mixing alkali activated slag mortar(SAAS), tap water mixing alkali activated slag mortar(TAAS) and cement slag blended mortar(CS)) after wetting drying cycles in artificial sea waters was investigated. The corrosion behaviors of two types of rebars, low carbon rebar(LC) and low alloy rebar(LA), in three types of mortars were tested via corrosion potential(Ecorr), linear polarization resistance(RP), and electrochemical impedance spectroscopy EIS measurements. The results show that, during the wetting drying cycles, SAAS and TAAS mortars have higher compressive strength than CS mortars. No significant difference of corrosion behavior can be observed for rebars in SAAS mortars and TAAS mortars. After 6 months of wetting drying cycles, it is indicated by increasing Rp and charge transfer resistance (Rct) values that both LC and LA in all mortars exhibit low corrosion rate.