为了研究掺粉煤灰水泥基材料的交流阻抗弥散效应,测试并解析了粉煤灰掺量分别为0%、10%、20%及30%,水胶比为0.4的水泥基材料试件在14 d、28 d、56 d、70 d及91d龄期时的交流阻抗谱.结果表明:基体CPE1值随水化时间呈指数式降低,CPE1的弥散指数n1随着水化时间呈对数式增大.掺0%和10%粉煤灰试件不连通孔的CPE2值远大于掺20%和30%粉煤灰试件CPE2值.无论粉煤灰掺量多少,CPE2值均随水化时间先增大,后减小.对于不同粉煤灰掺量的CPE2弥散指数n2值随水化时间呈幂函数降低.粉煤灰的掺入较大地改变了水泥基材料的弥散效应,因此,考虑弥散效应解析掺粉煤灰水泥基材料交流阻抗谱是十分必要的.
参考文献
[1] | B. Diaz;L. Freire;P. Merino;X. R. Novoa;M. C. Perez.Impedance spectroscopy study of saturated mortar samples[J].Electrochimica Acta,200825(25):7549-7555. |
[2] | W. J. McCarter;G. Starrs.Impedance characterization of ordinary Portland cement-pulverized fly ash binders[J].Journal of Materials Science Letters,19978(8):605-607. |
[3] | W.J.M.Carter;G.Starrs.Immittance spectra for Portland cement/fly ash-based binders during early hydration[J].Cement and Concrete Research,19993(3):377-387. |
[4] | 史美伦;张震雷;贺鸿珠.粉煤灰的细度和交流阻抗谱的关系[J].粉煤灰,2005(2):18-19,21. |
[5] | 张静萍;史美伦;贺鸿珠.粉煤灰火山灰活性的交流阻抗研究[J].粉煤灰,2010(3):17-19. |
[6] | 安晓鹏;史才军;曹张;王德辉;何富强;胡张莉.硬化水泥浆体体积电阻和孔结构的关系[J].硅酸盐学报,2014(8):1011-1017. |
[7] | Guangling Song.Equivalent circuit model for AC electrochemical impedance spectroscopy of concrete[J].Cement and Concrete Research,200011(11):1723-1730. |
[8] | Edwards DD.;Ford SJ.;Mason TO.;Hwang JH..EXPERIMENTAL LIMITATIONS IN IMPEDANCE SPECTROSCOPY .5. APPARATUS CONTRIBUTIONS AND CORRECTIONS[J].Solid state ionics,19971/2(1/2):85-93. |
[9] | I. Sanchez;X.R. N6voa;G. de Vera.Microstructural modifications in Portland cement concrete due to forced ionic migration tests. Study by impedance spectroscopy[J].Cement and Concrete Research,20087(7):1015-1025. |
[10] | 李永鑫;陈益民;贺行洋;韦江雄;张文生;张洪滔;郭随华.粉煤灰-水泥浆体的孔体积分形维数及其与孔结构和强度的关系[J].硅酸盐学报,2003(8):774-779. |
[11] | Christelle Despas;Verena Schnitzlerb;Pascal Janvierc;Franck Fayonde;Dominique Massiotde;Jean-Michel Boulerf;Bruno Bujolic;Alain Walcarius.High-frequency impedance measurement as a relevant tool for monitoring the apatitic cement setting reaction[J].Acta biomaterialia,20142(2):940-950. |
[12] | Pajkossy T.Impedance spectroscopy at interfaces of metals and aqueous solutions - Surface roughness, CPE and related issues[J].Solid state ionics,200525/28(25/28):1997-2003. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%