Methodology for pH measurement in high alkali cementitious systems

Methodology for pH measurement in high alkali cementitious systems
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高碱水泥体系 pH 测量方法

DOI:
10.1016/j.cemconres.2020.106122
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发表时间:
2020
影响因子:
11.4
通讯作者:
Myers, Rupert J.
Myers, Rupert J.
中科院分区:
工程技术1区
文献类型:
--
作者:
Traynor, Brian;Uvegi, Hugo;Olivetti, Elsa;Lothenbach, Barbara;Myers, Rupert J.

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提出了一种在高碱性溶液中校准pH计的方法,例如与水泥体系相关的溶液。该方法使用Debye-Hückel方程的扩展形式,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。这种方法进行了比较与“内置”的校准过程的基础上pH 4,7和10的标准溶液。内置的校准过程低估了真实的pH值高达0.3个对数单位,这是由于碱误差。作为支持信息,提供了用于确定校准曲线及其在pH计读数中的应用的电子表格。不正确校准的pH计解释溶液化学在水泥系统的影响进行了讨论。
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-Hückel 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.
硅铝凝胶在不同pH溶液中的溶解度水泥中矿渣和粉煤灰水化的探讨
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