水泥/混凝土中氯离子含量检测

Portland cement is one of the basic materials in the construction industry. The principal component of Portland cement is clinker. According to the cement nomenclature, clinker contains two silicate phases: Ca3SiO5 (alite) and Ca2SiO4 (belite), as well as aluminate and ferrite. The alite to belite ratio is responsible for the strength of Portland cement in cement clinker. The ability of determining this ratio already during the burning phase is essential for the evaluation of the cement’s final strength.

水泥，粉状水硬性无机胶凝材料。加水搅拌后成浆体，能在空气中硬化或者在水中硬化，并能把砂、石等材料牢固地胶结在一起。水泥中Cl的存在，会导致混凝土的冻融和混凝土中的钢筋锈蚀，影响到混凝土建筑物的寿命和安全。本试验通过CT-1Plus自动电位滴定仪来测定某水泥标准样中的氯离子含量。

混凝土中氯离子含量的测定 应用资料 硬化混凝土中氯离子(Cl-)的测定，采用氯离子选择性电极和硫酸汞参比电极进行电位滴定测定，参照GB/T 8077, GB/T 50344 标准的试验方法。在样品中加入2mol/L硝酸和30%过氧化氢溶液后，冷却至室温，再加入0.005mol/L氯化钠。用0.005mol/L硝酸银滴定至滴定曲线上的最大拐点为终点。根据硝酸银的滴定体积计算出氯离子。