海砂砂浆水化过程的电化学阻抗谱研究  

Electrochemical Impedance Spectroscopy on the Hydration Behavior of the Mortar with Marine Sand

作　　者：董必钦[1,2] 刘伟[1,2] 马红岩[1,2] 邢锋[1,2] 

机构地区：[1]深圳大学广东省滨海土木工程耐久性重点实验室,广东深圳518060 [2]深圳大学土木工程学院,广东深圳518060

出　　处：《建筑材料学报》2013年第2期306-309,320,共5页Journal of Building Materials

基　　金：广东省自然科学基金研究团队项目(9351806001000001);国家自然基金重大国际(地区)合作与交流项目(51120185002);国家自然科学基金资助项目(51272160)

摘　　要：采用电化学阻抗谱(EIS)方法,对海砂砂浆的水化过程进行了研究,探讨了海砂对水泥基材料的作用和影响.结果表明:海砂砂浆水化过程的EIS比一般的电化学体系复杂得多,同时表现出电解质特征(低频)和电介质特征(高频);在海砂砂浆的水化过程中,海砂中的Cl-释放是一个持续的过程,其对水泥基材料水化进程的促进作用也是个长期的过程;随着海砂砂浆中Cl-含量的提高,水化反应产生的OH-与游离的Ca2+反应生成Ca(OH)2,使C-S-H凝胶的体积分数下降,Ca(OH)2和钙矾石体积分数增加,从而导致海砂砂浆的孔结构疏松且分布不均匀.It is important to utilize marine sand as raw materials in civil engineering. The influence of the marine sand to the properties of cement and steel materials are concerned. In this paper, the electrochemical impedance spectroscopy（EIS） method is introduced to study the hydration behavior of the mortar with marine sand, in order to make an interpretation of the function of marine sand on the cement materials. The results of experiments show that the hydration of mortar with marine sand is a complex procedure and it holds both dielectric characteristic（low frequency in EIS） and electrolytic characteristic（high frequency in EIS）. The releasing of CI- is a continuous procedure and it is long term acceleration for hydration of mortar. The more concentration of C1 - , the more contents of hydration product Ca（OH）2 is produced from the surface of C-S-H gels. It will make the proportion C-S-H gels decreasing, whereas the proportion of Ca （O H） 2 and 6ttringite increasing.

关 键 词：海砂 砂浆 水化 电化学阻抗谱 

分 类 号：TU528.01[建筑科学—建筑技术科学]