Stray Current Affects the Release of Bound Chloride Ions in Hydrated Cement Paste
Stray Current Affects the Release of Bound Chloride Ions in Hydrated Cement Paste
复制标题
杂散电流影响水化水泥浆体中结合氯离子的释放
DOI：
10.20964/2018.06.77
复制
发表时间：
2018-06-01
影响因子：
1.5
通讯作者：
Din, Qingjun
中科院分区：
文献类型：
--
作者：
Pan, Chonggen;Geng, Jian;Din, Qingjun
在这里，杂散电流对结合的氯离子的释放的影响进行了评估，使用施加的直流电（DC）。杂散电流诱导释放的结合氯离子，这升级与增加加载时间和电压。水化水泥浆体中结合态氯离子的释放是由于C-S-H凝胶吸附的氯离子释放所致。由于它们在杂散电流的电场中的吸引，吸附在C-S-H凝胶的双电层（EDL）中的氯离子（包括Stern层和扩散层）被释放。这也导致C-S-H凝胶表面的ζ电位（ζ）增加。由于EDL的厚度将由于杂散电流的电场而逐渐变薄，因此在杂散电流停止后，重新进入EDL的氯离子的量将减少。鉴于此，杂散电流对水合水泥浆体中结合氯离子的稳定性有长期的负面影响。
Here, the effect of stray current on the release of bound chloride ions was evaluated using applied direct current (DC). Stray current induced the release of bound chloride ions, which escalated with both increasing loading time and voltage. The release of bound chloride ions in hydrated cement paste (HCP) was attributed to the release of chloride ions that had been adsorbed by the C-S-H gel. Owing to their attraction in the stray current’s electrical field, adsorbed chloride ions in the electrical double layer(EDL) of the C-S-H gel—including both Stern and diffusion layers—were released. This also resulted in an increased zeta potential (ζ) of the C-S-H gel surface. Since the EDL thickness will gradually thin due to the stray current’s electrical field, the amount of chloride ions re-entering the EDL will decrease after the stray current is stopped. Given this, there is a long-term, negative effect of stray current on the stability of bound chloride ions in hydrated cement paste.