Study on the reinforcing mechanisms of nano silica to cement-based materials with theoretical calculation and experimental evidence
Study on the reinforcing mechanisms of nano silica to cement-based materials with theoretical calculation and experimental evidence
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纳米二氧化硅对水泥基材料增强机理的理论计算和实验证据研究
DOI：
10.1177/0021998316632602
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发表时间：
2016-02
影响因子：
2.9
通讯作者：
J.P. Ou
中科院分区：
文献类型：
--
作者：
L.Q. Zhang;N. Ma;Y.Y. Wang;B.G. Han;X. Cui;X. Yu;J.P. Ou
制备了不同掺量的纳米二氧化硅(NS)水泥砂浆，并对其进行了测试。其抗压和抗弯强度均有显著提高。采用理论计算和热重(TG)分析、扫描电子显微镜(SEM)、X-射线粉末衍射仪(XRD)和电阻率测试等方法分析了NS的增强机理。理论上，消耗的氢氧化钙(CH)随着NS含量的增加而增加，这表明NS与CH有很大的反应潜力。热重分析结果表明，当NS含量小于1.5%时，CH的消耗量增加，与理论计算一致。然而，当NS含量超过1.5%时，TG结果中消耗的CH的质量达到了一个平台。扫描电子显微镜分析表明，NS能使基体致密，并使界面过渡区(ITZ)附近的基体中CH尺寸减小。X-射线衍射仪测试结果表明，NS能改变CH在水泥基质中的结晶倾向。然而，CH在水泥基质中结晶倾向的变化程度低于在ITZ中的变化。电阻率随NS含量和养护龄期的变化趋势与抗折强度和抗压强度的变化趋势相似。这表明，电阻率可以反映水泥基质的强度和结构密实度。
Cement mortars with different contents of nano silica (NS) were fabricated and tested. Their compressive and flexural strengths showed significant increases. Theoretical calculation and thermogravimetry (TG) analysis, scanning electron microscope (SEM) and X-Ray powder diffraction (XRD), and electrical resistivity test were used to analyze the reinforcing mechanisms of NS. Theoretically, consumed calcium hydroxide (CH) increases with NS content, which indicates that NS has huge potential to react with CH. According to the results of TG, the amount of consumed CH increases and agrees with theoretical calculation when the content of NS is less than 1.5%. However, a plateau is achieved for the mass of consumed CH in results of TG when the content of NS exceeds 1.5%. SEM shows that NS can make matrix dense and also reduce the size of CH in matrix beside interfacial transition zone (ITZ). The results of XRD prove that NS can change the tendency of crystal of CH in cement matrix. However, the change degree of tendency of crystal of CH in cement matrix is lower than that in ITZ. The change trends of electrical resistivity with increasing NS content and curing age are similar with those of flexural and compressive strengths. This indicates that electrical resistivity can reflect strength and structural compactness of cement matrix.
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