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研究了不同粉煤灰、矿粉、硅灰掺量的混凝土在单一氯盐、复合溶液以及青海盐湖卤水溶液中的氯离子结合规律。结果表明:混凝土在氯盐溶液中结合氯离子的产物为Friedel’s盐,其在NaCl腐蚀溶液中的氯离子结合能力最大,复合溶液和青海盐湖卤水溶液中由于硫酸根离子的存在降低了混凝土的氯离子结合能力,且随腐蚀溶液中的硫酸盐浓度增加而降低。普通混凝土在青海盐湖溶液中腐蚀,其氯离子结合能力在0.15左右;粉煤灰、矿渣和硅灰混凝土的氯离子结合能力分别为0.13～0.24,0.25～0.40和0.20～0.34。混凝土中掺加20%粉煤灰,或35%矿渣以及8%硅灰对氯离子具有最大的结合效果。此外,还使用热分析和X射线衍射技术研究了上述规律产生的微观机理。
The chloride ion incorporation of concrete with different fly ash, slag and silica fume content in single chloride salt, composite solution and Qinghai Salt Lake brine solution was studied. The results showed that the product of chloride ion mixed with chloride in the chloride salt solution was Friedel’s salt, which had the highest chloride ion binding capacity in NaCl solution. The presence of sulfate ion in the composite solution and Qinghai Salt Lake brine solution reduced the chloride Ion binding capacity decreases with increasing sulfate concentration in the etching solution. The corrosion of ordinary concrete in Qinghai Salt Lake was about 0.15. The chloride ion binding capacity of fly ash, slag and silica fume concrete were 0.13 ~ 0.24, 0.25 ~ 0.40 and 0.20 ~ 0.34, respectively. Concrete mixed with 20% fly ash, or 35% slag and 8% silica fume on chloride ion has the greatest combination. In addition, thermal analysis and X-ray diffraction were also used to study the microscopic mechanism of the above rules.