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The Use of Thermogravimetry in Quantifying the Hydration Products in Cement-Stabilized Kaolinite

机译：热重分析法在水泥稳定高岭土中定量水化产物的应用

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The study presented in this paper was aimed at investigating the use of thermogravimetry (TG) to quantify the amounts of various hydration products, particularly calcium silicate hydrate (CSH) and calcium hydroxide (CH), in stabilized soils and establish correlations between them and strength gain over time. For that purpose, a pure kaolinite was chosen as the soil for this study and Portland cement was the selected stabilizer. Kaolinite samples and cement-stabilized samples were compacted at their optimum conditions and cured for different periods of time up to 90 days. The unconfined compression test, which is a relatively simple and commonly used test, was performed to measure the Unconfined Compressive Strength (UCS) for all the samples and record the macroscopic behavior. Then, a portion of soil from each set of samples was recovered and subsequently subjected to the TG test which was performed at a constant heating rate of 10 K/min until 1000 °C, while being connected to a Mass Spectrometer (MS) for simultaneous evolved gas analysis. The thermal decomposition was divided into four major regions ⅰ) desorption of adsorbed water below 105 °C, ⅱ) dehydration of CSH phases between 105 and 440 °C, ⅲ) dehydroxylation of kaolinite and CH between 440 and 580 °C, and ⅳ) decarbonation of calcium carbonate at temperature between 580 and 1000 °C. The quantitative analysis revealed that strong linear correlations exist between the amounts of CSH and CH, and strength gain.
机译：本文提出的研究旨在调查使用热重法（TG）来量化稳定化土壤中各种水合产物的量，尤其是硅酸钙水合物（CSH）和氢氧化钙（CH）的量，并建立它们与强度之间的关系。随着时间的流逝。为此，本研究选择了纯高岭土作为土壤，而波特兰水泥则被选为稳定剂。高岭石样品和水泥稳定的样品在其最佳条件下压实，并在长达90天的不同时间段内固化。进行了无限制压缩测试，这是一个相对简单且常用的测试，用于测量所有样品的无限制压缩强度（UCS）并记录宏观行为。然后，从每组样品中回收一部分土壤，然后进行TG测试，该测试以10 K / min的恒定加热速率进行直到1000°C，同时连接到质谱仪（MS）上以同时进行析出气体分析。热分解分为四个主要区域：ⅰ）低于105°C的吸附水的脱附，ⅱ）105-440°C的CSH相脱水，ⅲ）440-580°C的高岭石和CH脱羟基，以及ⅳ）在580至1000°C的温度下对碳酸钙进行脱碳。定量分析表明，CSH和CH的含量与强度增加之间存在很强的线性相关性。

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