Effects of Electrochemical Chloride Extraction on Hydrated Products of Various Cement Paste Systems
Effects of Electrochemical Chloride Extraction on Hydrated Products of Various Cement Paste Systems
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DOI：
10.3151/jact.13.564
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发表时间：
2015-12
影响因子：
2
通讯作者：
Hai Yen Nguyen Thi;H. Yokota;K. Hashimoto
中科院分区：
文献类型：
--
作者：
Hai Yen Nguyen Thi;H. Yokota;K. Hashimoto
电化学氯离子萃取长期应用对水化水泥制品结合力的不利影响是不可忽视的。本研究采用改良的迁移池，在施加电流密度为4.5 a / m2的条件下，以合成的孔隙溶液为电解质，连续8周，研究电化学氯离子萃取对水泥浆水化水泥产物微观结构性能的影响。采用水胶比为0.4的普通硅酸盐水泥（OPC）、粉煤灰水泥（FC）和高炉矿渣磨粒水泥（SC）三种水泥浆体。氯源为1.5%氯化钠。提取后，酸溶性和水溶性氯化物含量显著降低。尽管钙离子对电流传递的贡献可以忽略不计，但OPC和FC膏体中的波特兰石含量随萃取时间的增加而成比例地增加。停止萃取后，短时间内得到了一些不稳定的凝胶相。此外，C-S-H的蚀变和分解是不可避免的，不同水泥类型的蚀变和分解速率不同。
The adverse effects of the long term application of electrochemical chloride extraction on binding capacity of hydrated cement products are innegligible. In this study, the influences of electrochemical chloride extraction in the microstructural properties of hydrated cement products of cement pastes were investigated in paste specimens by using a modified migration cell that was conducted with the applied current density of 4.5 A/m 2 and synthesized pore solutions as electrolytes for 8 weeks. Three types of cement pastes were used with the water-to-binder ratio of 0.4 including ordinary Portland cement (OPC), fly ash cement (FC) and ground granulated blast furnace slag cement (SC) pastes. Chloride source was supplied by adding 1.5% sodium chloride. After extraction, the acid-soluble and water-soluble chloride contents significantly reduced. Portlandite content increased proportionally with the time of extraction in OPC and FC pastes although the contribution of calcium ions in transferring the current is negligible. Some unsteady gel phases was obtained after a short time the extraction was stopped. Furthermore, the alteration and decomposition of C-S-H were inevitable with different rates depending on the type of cement.