| 不同因素下钢筋混凝土电化学除氯效率研究 |
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| 引用本文： | 屈锋,孙浩然,雷智昊,石卫华,王功勋,胡松.不同因素下钢筋混凝土电化学除氯效率研究[J].腐蚀科学与防护技术,2019,31(5):515-520. |
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| 作者姓名： | 屈锋 孙浩然 雷智昊 石卫华 王功勋 胡松 |
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| 作者单位： | 湖南科技大学土木工程学院 湘潭411201;湖南科技大学结构抗风与震动控制湖南省重点实验室 湘潭411201;湖南科技大学土木工程学院 湘潭411201 |
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| 摘 要： | 采用2 A/m^2的电流密度、饱和氢氧化钙溶液、不锈钢网对钢筋混凝土试件进行电化学除氯实验,研究除氯时间、粉煤灰掺量、减水剂、引气剂对电化学除氯效率及残留Cl^-含量的影响。结果表明:除氯效率随通电时间增长而提高;掺10%与20%粉煤灰的试件28 d除氯效率分别为56.9%与54.3%,粉煤灰掺量的增加对除氯效率无明显增益;经28 d除氯,掺入减水剂试件比普通组除氯效率下降约10%;掺引气剂除氯效率约75.1%。除氯后,Cl^-集中在距试件表面15~35 mm的范围内,钢筋附近Cl^-含量大幅下降。经试件钢筋锈蚀电位测量可见,除氯时电位负向增大,除氯一段时间后电位正向移动,逐渐达到钝化电位。
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| 关 键 词： | 钢筋混凝土 电化学除氯 外加剂 掺合料 锈蚀电位 |
| 收稿时间： | 2019-01-25 |
Effect of Several Processing Factors on Electrochemical Dechlorination Efficiency of Reinforced Concrete |
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| QU Feng,SUN Haoran,LEI Zhihao,SHI Weihua,WANG Gongxun,HU Song.Effect of Several Processing Factors on Electrochemical Dechlorination Efficiency of Reinforced Concrete[J].Corrosion Science and Protection Technology,2019,31(5):515-520. |
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| Authors: | QU Feng SUN Haoran LEI Zhihao SHI Weihua WANG Gongxun HU Song |
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| Affiliation: | (School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control,Hunan University of Science and Technology,Xiangtan 411201,China) |
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| Abstract: | The effect of processing factors such as time, fly ash content, water reducing agent and air entraining agent on the electrochemical dechlorination efficiency was studied for reinforced concretes with saturated calcium hydroxide solution as electrolyte and stainless steel mesh as anode by an applied current density of 2 A/m2. The results showed that with the increasing time, the dechlorination efficiency increases. The 28 d dechlorination efficiency of concretes with 10% and 20% fly ash is 56.9% and 54.3% respectively, showing that the increase of fly ash content has little effect on the dechlorination efficiency. The 28 d dechlorination efficiency of concretes incorporated with water reducing agent is about 10% lower than that of the blank counterparts, while those incorporated with air entraining agent exhibits higher dechlorination efficiency than the blank counterparts, which reaches about 75.1%. After dechlorination, the residual chloride ions in the concretes concentrated within a zone below the concrete surface 15 mm to 35 mm, while the chloride ion nearby the steel bar is greatly reduced. During the dechlorination process, the potential of the reinforced bar increased negatively in the initial stage, then moved positively after a certain period, and later gradually reached the level of passivation potential. |
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| Keywords: | reinforced concrete electrochemical dechlorination admixture additive corrosion potential |
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