改性珊瑚骨料混凝土中钢筋的腐蚀行为  

Corrosion Behavior of Steel Bars in Modified Coral Aggregate Concrete

作　　者：张路 牛荻涛[1,2] 文波[1,2] 张永利[1,2] 陈昊[1] ZHANG Lu;NIU Ditao;WEN Bo;ZHANG Yongli;CHEN Hao(School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;State Key Laboratory of Green Building in Western China,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]西安建筑科技大学省部共建西部绿色建筑国家重点实验室,西安710055

出　　处：《材料导报》2022年第6期94-100,共7页Materials Reports

基　　金：国家自然科学基金重大项目支课题(51590914);国家自然科学基金项目(52078413,52078415);陕西省教育厅科研计划项目(18JS062)。

摘　　要：本工作比较了由珊瑚骨料和不同的掺合料制成的钢筋混凝土构件在海洋环境中的耐久性。基于线性极化法和交流阻抗谱法,分析了改性珊瑚骨料混凝土中钢筋的腐蚀行为。研究结论如下:(1)采用线性极化法和交流阻抗谱法测试了改性珊瑚骨料混凝土中钢筋的动电位极化曲线、容抗弧曲线和阻抗模量曲线,定量分析了电化学参数对钢筋腐蚀的影响规律。(2)提出了掺合料珊瑚骨料混凝土耐久性能系数,用以表征钢筋在粉煤灰、硅灰和矿渣珊瑚骨料混凝土中的抗钢筋锈蚀性能提高值。10%硅灰掺量的珊瑚骨料混凝土的抗钢筋锈蚀性能提高了87.0%,20%矿渣掺量的珊瑚骨料混凝土的抗钢筋锈蚀性能提高了68.73%,20%粉煤灰掺量的珊瑚骨料混凝土的抗钢筋锈蚀性能提高了50.15%。(3)建立了掺合料用量和钢筋腐蚀电流密度的回归分析函数,并且得出掺合料对珊瑚骨料混凝土中钢筋锈蚀速率的修正系数。The durability of reinforced concrete components made from coral aggregate and different admixtures in marine environment were compared.The corrosion behavior of reinforcement in modified coral aggregate concrete(MCAC)was analyzed by electrochemical measurement.The research conclusions are as follows:(Ⅰ)the dynamic potential polarization,capacitance-reactance and impedance modulus curves of steel bars in MCAC were tested by linear polarization and electrochemical impedance spectrum,and the influence of electrochemical parameters on steel bars corrosion was quantitatively analyzed.(Ⅱ)The durability coefficient of MCAC was proposed to represent the improved corrosion resistance value of steel bars in MCAC with FA,SF and GGBS.Compared to the MCAC without admixtures,the chloride resistance of the MCAC containing 10%SF,20%GGBS,and 20%FA increased by 87.0%,68.73%,and 50.15%,respectively.(Ⅲ)The regression analysis function of admixtures and corrosion rate of steel bars in MCAC was established,and the correction coefficient of admixtures to the corrosion rate of steel bars in MCAC was obtained.

关 键 词：珊瑚骨料混凝土 掺合料 腐蚀行为 电化学测试 锈蚀速率 

分 类 号：TU502.5[建筑科学—建筑技术科学]