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Methodology for pH measurement in high alkali cementitious systems
Cement and Concrete Research ( IF 11.4 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.cemconres.2020.106122
Brian Traynor , Hugo Uvegi , Elsa Olivetti , Barbara Lothenbach , Rupert J. Myers

Abstract A methodology for calibrating pH meters in highly alkaline solutions such as those relevant to cementitious systems is presented. This methodology uses an extended form of the Debye-Huckel equation to generate a calibration curve of pH vs. the measured electrochemical potential (mV) based on a series of aqueous alkali hydroxide solutions of known concentrations. This methodology is compared with the ‘built-in’ process of calibration based upon pH 4, 7, and 10 standard solutions. The built-in calibration process underestimates the real pH values by up to 0.3 log units, which is attributed to the alkali error. A spreadsheet for determining the calibration curve and its application to pH meter readings is provided as Supporting Information. The implications of improperly calibrated pH meters on interpreting solution chemistry in cementitious systems are discussed.

中文翻译:

高碱胶凝体系中 pH 测量的方法

摘要 介绍了一种在高碱性溶液(例如与水泥体系相关的溶液)中校准 pH 计的方法。该方法使用 Debye-Huckel 方程的扩展形式,以基于一系列已知浓度的碱金属氢氧化物水溶液生成 pH 值与测量的电化学电位 (mV) 的校准曲线。将此方法与基于 pH 4、7 和 10 标准溶液的“内置”校准过程进行比较。内置校准过程将实际 pH 值低估了多达 0.3 个对数单位,这是由于碱误差造成的。用于确定校准曲线及其在 pH 计读数中的应用的电子表格作为支持信息提供。
更新日期:2020-09-01
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