不同电流密度下混凝土裂缝电沉积产物的分布特性
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TU528.01

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国家自然科学基金(51638013、51578490、51820105012);浙江省自然科学基金(LQ19E080012、LY18E080003);宁波市自然科学基金(2018A610359)


Distribution characteristics of electrodeposition products of concrete cracks under different current densities
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    摘要:

    选用ZnSO4作为电沉积溶液,以混凝土裂缝处电阻及裂缝填充深度为评价指标,研究电流密度对电沉积修复钢筋混凝土裂缝效果的影响及对沉积物矿物成分和微观形貌的影响。研究结果表明:经过电沉积修复36 d,混凝土试件电阻显著增加,电阻增加速率随着通电时间增加而减小,电流密度越大,早期电阻增加速率越快,但裂缝填充深度越小。X射线衍射结果表明,沉积物主要矿物成分为ZnO。电镜扫描结果表明,沉积物颗粒大小随着电流密度增大而变大,电流密度越小,沉积物排列越有序,结构越致密。

    Abstract:

    The solution with ZnSO4 was chosen to repair the crack of concrete by electro-migration. To explore the influence of current density on electrodeposition repairing performance, mineral composition and microstructure of the sediments, the electrical resistance and crack filling depth were used in this study. Results show that the resistance of concrete specimens increased significantly after the electrodeposition repair for 36 days, and the growth rate of resistance decreased with increase of energization days. The early rate of the resistance increase was faster, and the depth of crack filling was more shallow with increase of current density. Besides, X-ray diffraction results showed that ZnO was the main mineral component of the sediments. Scanning electron microscopy results showed that the size of sediment particles increased with increase of current density. The rank of sediments was more ordered and the microstructure was more compacted as the current density decreased.

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金伟良,彭文浩,毛江鸿,王金权,樊玮洁,潘崇根.不同电流密度下混凝土裂缝电沉积产物的分布特性[J].土木与环境工程学报(中英文),2019,41(3):127-133. Jin Weiliang, Peng Wenhao, Mao Jianghong, Wang Jinquan, Fan Weijie, Pan Chonggen. Distribution characteristics of electrodeposition products of concrete cracks under different current densities[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2019,41(3):127-133.10.11835/j. issn.2096-6717.2019.058

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  • 收稿日期:2018-10-15
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  • 在线发布日期: 2019-06-03
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