The destabilization together with boundary chloride ions releasing leads to the corrosion of steel bars, posing nonnegligible risks to the durability of structures. This work attempted to design the typical pore solution of underground constructions via methods of combining NaCl with Na₂SO₄ along with conducting a stray current continuously. The bound chloride stability of mortar under the action of electric current was systematically determined. The reaction mechanisms were tested by quantitative XRD, TG-DTG, FTIR, FESEM, and X-CT. Molecular dynamics was utilized to simulate the physical binding processes of C–S–H of Cl⁻/SO₄^2- and their interaction under the actions of electric field by comparing the ions displacement trajectory, radial distribution function, and moving ability. The experimental results showed that the SO₄^2- weakened the chemical chloride binding capacity with the Friedel's salt, portlandite, and calcium silicate decomposed to produce gypsum or ettringite. The electric field demonstrated less impact on the stabilities of chemical-bound Cl⁻, but promoted SO₄^2- redistributions, causing substantial pore coarsening. The simulation revealed that the physical binding contained short-range ion Coulomb-interactions and long-range van der Waals interactions. The SO₄^2- inhibited the binding of the C–S–H on Cl⁻ by fact that the deposition large cluster of Na–SO₄ blocked the nano-meter channels and competitive adsorption occurred at the SiOCa⁺ sites, while the introduction of electric field weakened the dominating effects of Coulomb-interactions and improved the ions desorption gradually. Hopefully, the transport and adsorption mechanisms of the Cl⁻ in the cement-based materials can help guide the underground concrete with durability.

不稳定和边界氯离子释放导致钢筋腐蚀，对结构的耐久性造成不可忽视的风险。本工作尝试通过将NaCl与Na ₂ SO ₄结合并连续传导杂散电流的方法来设计地下建筑物的典型孔隙解决方案。系统测定了电流作用下砂浆的结合氯稳定性。通过定量 XRD、TG-DTG、 FTIR、 FESEM 和 X-CT测试了反应机理。利用分子动力学模拟了Cl ^- /SO ₄ ^{2-的C–S–H}在电场作用下的物理结合过程及其相互作用，通过比较离子的位移轨迹、径向分布函数和移动能力。实验结果表明，SO ₄ ^2-削弱了弗里德尔盐、硅酸钙石和硅酸钙分解生成石膏或钙矾石的化学氯化物结合能力。电场对化学结合的Cl ^-的稳定性影响较小，但促进了SO ₄ ^2-的重新分布，导致孔隙显着粗化。模拟表明，物理结合包含短程离子库仑相互作用和长程范德华相互作用。SO ₄ ^2-抑制 C-S-H 与 Cl ^-的结合是通过 Na-SO _{4的沉积大团簇}堵塞纳米通道并在 SiOCa ⁺位点发生竞争吸附，同时引入电场减弱了库仑相互作用的主导作用并逐渐改善了离子的解吸。希望水泥基材料中 Cl− 的传输和吸附机制能够帮助引导地下混凝土的^耐久性。