Effects of barium salt on the fixation of chloride ions in hardened mortars
Effects of barium salt on the fixation of chloride ions in hardened mortars
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DOI：
10.1016/s0008-8846(00)00308-2
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发表时间：
2000-09
影响因子：
11.4
通讯作者：
N. Tsuyuki;R. Watanabe;K. Koizumi;Y. Umemura;Osamu Machinaga
中科院分区：
文献类型：
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作者：
N. Tsuyuki;R. Watanabe;K. Koizumi;Y. Umemura;Osamu Machinaga
讨论了硫酸钡对氯离子的固定和渗透作用。有人发现，更大量的氯离子被固定在水合过程中的BaSO4的存在下合成的C3A。当C3A和CaSO4·2H2O在模拟海水中混合水化时，随着BaSO4的加入，单硫酸盐转化为Friedel盐的长期产量增加。讨论了阴离子交换过程中Friedel盐形成的机理。我们还研究了恒定电流下浸泡在模拟海水中的硬化砂浆试件的氯离子渗透性。含BaSO4的普通水泥砂浆的氯离子渗透性较小。因为我们发现在有或没有BaSO 4的水泥砂浆的孔结构中没有差异，所以最有可能的是，不仅合成的C3A，而且普通水泥砂浆可以在BaSO 4的存在下固定更大量的氯化物。
The effects of barium sulfate on the fixation and permeability of chloride ions are discussed. It was found that greater amounts of chloride ion were fixed during the hydration of C3A synthesized in the presence of BaSO4. When C3A and CaSO4·2H2O were mixed and hydrated in the pseudo-seawater, the long-term production of the Friedel salt, which was converted from monosulfate, increased with the amount of BaSO4. The mechanisms of the Friedel salt formation associated with the anion exchange are discussed. We also studied the chloride ion permeability in hardened mortar specimens immersed in the pseudo-seawater under a constant electric current. Ordinary cement mortar containing BaSO4showed smaller chloride ion permeability. Because we found no difference in the pore structure of the cement mortars with or without BaSO4, it is most likely that not only synthesized C3A but also the ordinary cement mortar can fix greater amounts of chloride in the presence of BaSO4.