不同干密度下重塑南阳膨胀土的电化学阻抗谱特性研究
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摘要
采用电化学工作站,对不同干密度下南阳重塑膨胀土进行电化学阻抗谱检测,借助等效电路参数探究干密度与重塑南阳膨胀土电化学阻抗谱之间的规律。结果表明:5种干密度的重塑膨胀土的电化学阻抗谱均呈现非Randles模型。随着干密度的增加,和试样孔隙比有关的溶液电阻Rs和电荷转移电阻Rt单调减小,双电层电容CPE-T逐渐增加。土体内部孔隙水的状态可以通过溶液电阻Rs衡量;土体内部的孔隙连通性可以通过电荷转移电阻Rt衡量;土体的孔隙结构和溶液浓度对双电层电容CPE-T有影响。电化学方法适用于表征膨胀土的压实特性,丰富了电化学阻抗谱的研究范围。
Herein electrochemical workstation was used to check the electrochemical impedance spectroscopy(EIS) of Nanyang remolded expansive soil in different dry densities and,in virtue of the equivalent circuit parameters,the law between the dry density and the EIS thereof was explored.The result shows that all of the EIS of remolded expansive soil in 5 dry densities present un-Randles model;as the dry density increases,the solution resistance Rsand the charge transfer resistance R t,which relate to the porosity ratio of specimen,decrease monotonically,and the electric double layer capacitor CPE-T increases gradually;the condition of pore water inside the soil mass can be measured by the solution resistance Rs,and the pore connectivity therein by the charge transfer resistance Rt;both the pore structure of the soil mass and the solution concentration have certain effect on the electric double layer capacitor CPE-T.Electrochemical method is applicable to represent the compaction characteristics of expansive soil,which enriches the study scope of EIS.
Herein electrochemical workstation was used to check the electrochemical impedance spectroscopy(EIS) of Nanyang remolded expansive soil in different dry densities and,in virtue of the equivalent circuit parameters,the law between the dry density and the EIS thereof was explored.The result shows that all of the EIS of remolded expansive soil in 5 dry densities present un-Randles model;as the dry density increases,the solution resistance Rsand the charge transfer resistance R t,which relate to the porosity ratio of specimen,decrease monotonically,and the electric double layer capacitor CPE-T increases gradually;the condition of pore water inside the soil mass can be measured by the solution resistance Rs,and the pore connectivity therein by the charge transfer resistance Rt;both the pore structure of the soil mass and the solution concentration have certain effect on the electric double layer capacitor CPE-T.Electrochemical method is applicable to represent the compaction characteristics of expansive soil,which enriches the study scope of EIS.
引文
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[14]SONG G L.Equivalent circuit model for AC electrochemical impedance spectroscopy of concrete[J].Cement and Concrete Research,2000,30(11):1723-1730.
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[2]胡江春.岩土电化学的理论及试验研究[M].北京:煤炭工业出版社,2014.HU J C.Theoretical and Experimental Study of Geochemistry[M].Beijing:China Coal Industry Publishing House,2013.
[3]Castela A S,Da Fonseca B S,Duarte R G,et al.Influence of unsupported concrete media in corrosion assessment for steel reinforcing concrete by electrochemical impedance spectroscopy[J].Electrochimica Acta,2014,124:52-60.
[4]史美伦,杨正宏.混凝土阻抗谱的拓扑结构[J].建筑材料学报,2002,5(2):132-136.SHI M L,YANG Z H.Topological structure of the spectroscopy of ACimpedance for concrete[J].Journal of Building Materials,2002,5(2):132-136.
[5]胡江春,王红芳,孙晓明,等.岩石的交流阻抗初步研究[J].岩石力学与工程学报,2006,25(9):1898-1903.HU J C,WANG H F,SUN X M,et al.Study on AC impedance of rocks[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(9):1898-1903.
[6]史美伦,张雄,李平江,等.胶凝材料的组成、力学性能与交流阻抗谱的关系[J].硅酸盐通报,1999(4):14-17.SHI M L,ZHANG X,LI P J,et al.Relation among the composition,mechanical properties and AC impedance spectra of cementitious materials[J].Bulletin of The Chinese Ceramic Society,1999(4):14-17.
[7]曹楚南,张鉴清.电化学阻抗谱导论[M].北京:科学出版社,2002.CAO C N,ZHANG J Q.An Introduction to Electrochemical Impedance Spectroscopy[M].Beijing:Science Press,2002.
[8]严奕博,韩鹏,谢瑞珍,等.p H对粉土电化学特性的影响试验研究[J].科学技术与工程,2017,17(17):297-303.YAN Y B,HAN P,XIE R Z,et al.Experimental study for the effect of p Hvalue on the electrochemical properties of silty soil[J].Science Technology and Engineering,2017,17(17):297-303.
[9]CHANG B Y,Park SM.Electrochemical impedance spectroscopy[J].Annual Review of Analytical Chemistry,2010,3:207-229.
[10]查甫生,刘松玉,杜延军.击实膨胀土的电阻率特性试验研究[J].公路交通科技,2007,24(2):28-32.ZHA F S,LIU S Y,DU Y J.Electrical resistivity characteristics of compacted expansive soil[J].Journal of Highway and Transportation Research and Development,2007,24(2):28-32.
[11]王帅,韩鹏举,申博著,等.灰土电化学阻抗谱(EIS)与力学性能的试验研究[J].科学技术与工程,2015,15(18):78-84,127.WANG S,HAN P J,SHEN B Z,et al.The study of the relation of electrochemical impedance spectroscopy(EIS)and mechanical properties for lime-soil[J].Science Technology and Engineering,2015,15(18):78-84,127.
[12]岳冰,赵明阶,韦刚.波动测试技术在土石复合路基压实度测试中的应用[J].公路,2005(5):129-133.YUE B,ZHAO M J,WEI G.Application of wave testing to detecting compact degree of soil-stone embankment[J].Highway,2005(5):129-133.
[13]李英涛.机场工程检测中固体体积率与压实度的关系研究[J].施工技术,2017(13):103-105.LI Y T.Research on relationship between solid volume ratio and compaction degree in airport projects detection[J].Construction Technology,2017(13):103-105.
[14]SONG G L.Equivalent circuit model for AC electrochemical impedance spectroscopy of concrete[J].Cement and Concrete Research,2000,30(11):1723-1730.
[15]史美伦,陈志源.混凝土阻抗谱的低频特性[J].硅酸盐学报,1996(6):703-706,615.SHI M L,CHEN Z Y.Low frequency characteristics of impedance spectroscopy of concrete[J].Journal of the Chinese Ceramic Society,1996(6):703-706,615.