钢筋混凝土电化学除氯化物试验研究

EXPERIMENTAL STUDY ON ELECTROCHEMICAL REMOVAL OF CHLORIDE FROM REINFORCED CONCRETE

本文采用钢筋混凝土电化学除氯技术来排出混凝土中的氯盐,由试验发现,电化学除氯处理过程中,除氯处理前期的氯离子排出量远大于中后期,并且随着通电时间的延续递减明显。在试验前期,试验电流密度对氯离子排出量的影响较为显著,2A/m^2电流密度作用下的氯离子排出量约是在1A/m^2作用下的1.4倍;而在除氯处理的后期,电流密度的大小则对氯离子排出量的影响不明显。通过EDAX能谱仪探究除氯处理后不同离子在混凝土中的分布规律。发现电化学除氯处理后,钢筋附近的混凝土与试件表面附近的混凝土相比,结构更加疏松,孔隙率以及裂缝数目较多,试件表面附近的混凝土的结构则比较致密,孔隙率相对较小。

This article uses electrochemical dechlorination technology of reinforced concrete to discharge the chloride salt in concrete. It is found from the experiment that the discharge amount of chloride ion in the early stage of dechlorination treatment is much larger than that in the middle and late period, and the continuation of the decline is obvious with the electrification time. In the early stage of the experiment, the test current density has a significant effect on chloride discharge. The discharge of chlorine ions at a current density of 2A/m2 is approximately 1.4 times compared with that at 1A/m2. In the later stages of dechlorination, the current density has little effect on the amount of chloride ion emitted. The EDAX spectrometer was used to investigate the distribution discipline of different ions in concrete after dechlorination. It was found that after the electrochemical dechlorination treatment, the concrete near the steel bar had looser structure, more porosity and more cracks than the concrete near the surface of the test piece, and the structure of the concrete near the surface of the test piece was denser and the porosity was relatively small.