Slag and Activator Chemistry Control the Reaction Kinetics of Sodium Metasilicate-Activated Slag Cements
Slag and Activator Chemistry Control the Reaction Kinetics of Sodium Metasilicate-Activated Slag Cements
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DOI：
10.3390/su10124709
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发表时间：
2018-12-01
期刊：
影响因子：
3.9
通讯作者：
Bernal, Susan A.
中科院分区：
文献类型：
--
作者：
Criado, Maria;Walkley, Brant;Bernal, Susan A.
用等温量热法研究了四种不同氧化镁含量(6%~14%)的高炉矿渣经四种不同剂量的偏硅酸钠活化后的反应动力学。反应动力学强烈地依赖于所使用的碱性激活剂的剂量以及炉渣的化学和物理性质。当使用低浓度偏硅酸钠作为活化剂时，渣中的氧化镁含量对反应动力学有影响，而随着偏硅酸钠浓度的增加，CaO含量的影响更为显著。这项研究阐明了碱激活剂的剂量与所用炉渣的化学成分之间的密切关系，尽管无法确定已发表的基于化学基础的炉渣质量系数与量热结果之间的任何明确相关性，这突显了高炉炉渣玻璃化学的复杂性，以及炉渣的物理性质在确定其反应性方面的重要性。
The reaction kinetics of four commercial ground granulated blast furnace slags with varying percentages of MgO (6 to 14 wt.%), activated with four different doses of sodium metasilicate, were evaluated using isothermal calorimetry. The reaction kinetics were strongly dependent on the dose of the alkaline activator used, and the chemical and physical properties of the slag. When using low concentrations of sodium metasilicate as an activator, the MgO content in the slag influences the kinetics of the reaction, while the CaO content plays a more significant role when the concentration of metasilicate is increased. This study elucidated a close relationship between the dose of the alkali-activator and the chemistry of the slag used, although it was not possible to identify a clear correlation between any of the published chemically-based slag quality moduli and the calorimetry results, highlighting the complexity of blast furnace slag glass chemistry, and the importance of the physical properties of the slag in defining its reactivity.