电导率法测定氯氧镁水泥中醇可抽提氯离子含量
作者:
作者单位:

中南大学 土木工程学院,湖南 长沙 410075

作者简介:

彭嘉伟(1996—),男,湖南长沙人,中南大学硕士生. E-mail: pengjiawei@csu.edu.cn

通讯作者:

刘赞群(1975—),男,湖南双峰人,中南大学教授,博士生导师,博士. E-mail: zanqun.liu@csu.edu.cn

中图分类号:

TU528.01


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

School of Civil Engineering, Central South University, Changsha 410075, China

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    摘要:

    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0.001 0~0.144 0 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.

    Abstract:

    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 0.001 0-0.144 0 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.

    表 4 粉末试样在抽提前后的物相组成Table 4 Phase contents of powder specimens before and after alcohol leaching w/%
    表 6 粉末试样无水乙醇抽提液中的Mg2+、Cl-物质的量及摩尔比Table 6 Mg2+, Cl- content and molar ratio of the leachate of powder specimens
    表 3 各溶液试样的氯化镁质量、氯离子浓度及电导率Table 3 Magnesium chloride mass, chloride concentration and conductivity of solution samples
    表 8 电导率法与汞量法的试验步骤对比Table 8 Comparison of test procedures of conductivity method and mercurimetric method
    表 1 氯氧镁水泥浆体试样的配合比Table 1 Mix proportion of MOC paste specimens
    表 2 氯氧镁水泥工业制品试样的配合比Table 2 Mix proportion of MOC industrial product specimens
    图1 粉末的粒度分布Fig.1 Particle size distribution of powder
    图2 粉末试样的XRD图谱Fig.2 XRD patterns of powder specimens
    图3 粉末试样的TG-DTG曲线Fig.3 TG-DTG curves of powder specimens
    图4 电导率-氯离子浓度拟合曲线Fig.4 Fiting curve of conductivity-Cl- concentration
    图5 M-2组粉末试样的醇可抽提氯离子含量随抽提时间的变化Fig.5 Changes of ALC with leaching time in M-2 powder specimen
    图6 不同液固比下的醇可抽提氯离子含量Fig.6 ALC in different liquid-solid ratios
    表 7 电导率法与汞量法测定的醇可抽提氯离子含量Table 7 ALC determined by conductivity method and mercurimetry method
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彭嘉伟,邓德华,刘赞群.电导率法测定氯氧镁水泥中醇可抽提氯离子含量[J].建筑材料学报,2022,25(8):877-884

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  • 收稿日期:2021-06-08
  • 最后修改日期:2021-09-06
  • 在线发布日期: 2023-09-15
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