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作 者:吴珊珊 WU Shan-shan(PowerChina Kunming Engineering Corporation Limited,Kunming 650051,Yunnan,China)
机构地区:[1]中国电建集团昆明勘测设计研究院有限公司,云南昆明650051
出 处:《云南水力发电》2018年第5期82-85,共4页Yunnan Water Power
摘 要:在实际混凝土介质中,采用干湿循环和外渗氯离子的试验方法,通过半电池电位和线性极化两种电化学方法检测,开展阻锈剂、矿物掺合料复掺时对混凝土中钢筋的腐蚀研究。研究结果表明:矿物掺合料和阻锈剂复掺能有效延缓混凝土中钢筋开始活性腐蚀的时间、提高钢筋腐蚀的临界氯离子浓度、降低腐蚀速率。矿渣+Ca(NO2)2提升幅度最大,能将氯离子浓度提高到1.89%;从延缓腐蚀时间和对临界氯离子浓度的提升效果,对钢筋抗氯离子腐蚀能力提升效果总体为:矿渣+Ca(NO2)2>矿渣+NNRI>矿渣+NNMI>粉煤灰+Ca(NO2)2>粉煤灰+NNRI>粉煤灰+NNMI。The paper made a study on corrosion of steel bar in concrete when the compound admixture of rust inhibitor and mineral admixture was added to concrete using the dry-wet cycle and the extravasation chloride ion test method and the semi-cell potential and linear polarization two electrochemical check methods in the case of practical concrete medium. The study result reveals that the compound admixture of rust inhibitor and mineral admixture can effectively retard the starting time of active corrosion of steel bar in concrete, enhance critical chloride ion concentration of steel bar corrosion and reduce rate of corrosion. Slag + Ca(NO2)2 can increase the chloride ion concentration by 1.98% to the greatest extent as compared with other admixtures, producing enhancement effect in terms of both retarding corrosion time and increase of critical chloride ion concentration. In general the chloride ion corrosion-resistance capability of the steel bar can be increased for different admixtures as follows: slag + Ca(NO2)2〉 slag + NNRI 〉 slag + NNMI 〉 fly ash + Ca(NO2)2 〉 fly ash + NNRI 〉 fly ash + NNMI.
分 类 号:TU502[建筑科学—建筑技术科学]
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