Effect of Triethanolamine on Hydration Kinetics of Cement–Fly Ash System at Elevated Curing Temperature,ACS Sustainable Chemistry & Engineering

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Effect of Triethanolamine on Hydration Kinetics of Cement–Fly Ash System at Elevated Curing Temperature
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-06-12 , DOI: 10.1021/acssuschemeng.0c01763
Jionghuang He ₁ , Guangcheng Long _{1,

2} , Cong Ma _{1,

2} , Kunlin Ma _{1,

2} , Youjun Xie _{1,

2} , Yi Shi ₁ , Ning Li ₁ , Zhiqing Cheng _{1,

3}

Affiliation

As a high-output industrial byproduct, fly ash can partially replace Portland cement in concrete, which is one of the important treatment methods to improve its utilization. However, the low activity of fly ash limits its substitution level. Previous studies demonstrated that adding triethanolamine (TEA) and elevated curing temperature are useful methods to promote the pozzolanic activity of fly ash, while the effect of TEA on the hydration kinetics of the cement–fly ash system (CFA) under elevated curing temperature is unclear. In this study, the hydration kinetics of the CFA system with different dosages of TEA under elevated curing temperature were investigated. The activation energy and pore solution of samples were analyzed to further clarify the corresponding mechanism. The results show that the effect of TEA on the hydration kinetics of the CFA pastes at 60 °C is different from that at 20 °C. The mean activation energies for each hydration process (NG, I, and D) of CFA pastes all decrease with the increased TEA dosage. The effect of TEA on the hydration kinetics of the CFA pastes at elevated temperature is closely related to the dissolution of the CFA system. These findings will further promote the high-value-added utilization of fly ash.

中文翻译：

高温固化过程中三乙醇胺对水泥-粉煤灰体系水化动力学的影响

粉煤灰作为高产工业副产品，可以部分替代混凝土中的硅酸盐水泥，是提高其利用率的重要处理方法之一。但是，粉煤灰的低活性限制了其替代水平。先前的研究表明，添加三乙醇胺（TEA）和提高固化温度是促进粉煤灰火山灰活性的有用方法，而在固化温度升高时TEA对水泥-粉煤灰系统（CFA）水化动力学的影响尚不清楚。在这项研究中，研究了在升高的固化温度下，不同剂量的TEA对CFA体系的水合动力学。分析了样品的活化能和孔溶液，以进一步阐明相应的机理。结果表明，TEA对CFA糊在60°C时的水合动力学的影响与在20°C时不同。CFA糊的每个水合过程（NG，I和D）的平均活化能都随着TEA剂量的增加而降低。在高温下，TEA对CFA糊的水合动力学的影响与CFA系统的溶解密切相关。这些发现将进一步促进粉煤灰的高附加值利用。

更新日期：2020-07-13

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