通过FTIR方法对硅酸盐水泥及其碳纳米管改性试样早龄期的水化进程进行了表征.研究结果显示:FTIR是一种操作简便且能够快速取得分析结论的研究方法,能够反映水泥水化后主要产物的基本变化情况.随着水化反应的进行,FTIR中的Si-O振动吸收峰峰值由低波数向高波数迁移,这一过程反映了C-S-H凝胶体中硅氧四面体的聚合过程,也同时反应了该阶段水泥浆体的水化反应速度.在8~12 h龄期时,掺CNTs试样与空白试样在800~1 025 cm-1处特征峰的迁移速度完全相同.因此,可以认为CNTs材料在掺入到硅酸盐水泥时并未对早龄期的水化反应产生影响.水化温度的试验也证明了上述观点.
In this paper, the hydration process of Portland cement and CNTs reinforced samples at the early age was characterized by FTIR spectroscopy.The rustles show that FTIR is a simple and rapid research method in operation, which can reflect the basic variation in the primary cement hydration products.With the proceeding of hydration reaction, the peak value corresponding to Si-O vibrations in FTIR spectrum shifts from low wavenumbers to high wavenumbers, which not only reflects the polymerization process of silicon-oxygen tetrahedrons in the C-S-H gel, but also the hydration reaction speed of cement paste at this stage.This viewpoint was confirmed by the experiment for the samples with added superplasticizer.The shifting characteristics of the absorption peaks in the range 800-1 025 cm-1 for the samples at the ages of 8-12 h were comprehensively investigated in this study.The research results show that the shifting speed of the characteristic peak for the blank sample is exactly the same as that for the sample reinforced with CNTs.Therefore, addition of CNTs materials into Portland cement doesn't influence the hydration reaction at the early age.This conclusion is verified by the calorimetry test for hydration temperature.
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