电导率法测定氯氧镁水泥中醇可抽提氯离子含量

Determination of Alcohol Leachable Chloride Ion Content of Magnesium Oxychloride Cement by Conductivity Method

将氯氧镁水泥硬化浆体中除结晶氯氧化物以外的含氯相统称为醇可抽提氯化物,其含量可由电导率法测定的醇可抽提氯离子含量来表征,以作为氯氧镁水泥及其工业制品性能与品质的评价指标.基于物理化学原理和大量试验,建立了氯离子浓度在0.0010~0.1440 mol/L范围内时,氯化镁无水乙醇溶液的电导率与氯离子浓度之间的数学关系,并提出了电导率法测定醇可抽提氯离子含量的相关参数和试验步骤.对比电导率法和汞量法的测试结果可以发现,电导率法能精确测定氯氧镁水泥硬化浆体及其工业制品中的醇可抽提氯离子含量,且该方法测试结果可靠、操作简便.

The chloride‑containing phases other than crystalline oxychloride in magnesium oxychloride cement(MOC)is proposed as alcohol leachable chloride,which can be used as an evaluation index of the properties and quality of magnesium oxychloride cement and its industrial products.Alcohol leachable chloride ion content(ALC)can be determined by conductivity method.Based on the principle of physical chemistry and a large number of experiments,the mathematical relationship between the conductivity of the magnesium chloride‑anhydrous ethanol solution and the concentration of chloride ion in the range of 0.0010-0.1440 mol/L was established,and the associated parameters and specific test procedures of the conductivity method were proposed.By comparison of the test results of conductivity method and mercurimetric method,it can be shown that the conductivity method can be applied to accurately determine ALC of the hardened magnesium oxychloride cement paste and its industrial products.Conductivity method has the advantages of accurate results and simple operation.