调凝剂对普通硅酸盐水泥水化及交流阻抗行为的影响

发布时间：2018-03-12 23:10

  本文选题：交流阻抗谱　切入点：水泥水化　出处：《哈尔滨工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：目前,在诸多水泥水化研究技术中,基于电化学性质对水泥凝结硬化过程进行研究极具前景。直流法或单频阻抗法研究浆体硬化过程中电导率变化缺乏准确性,交流阻抗法可以分离浆体效应和电极效应,从而消除界面间的极化反应,故交流阻抗法可以获得更多准确有用的信息。本文研究的目的在于探究EDTA和无水碳酸钠对普通硅酸盐水泥水化过程的作用机理,并将交流阻抗法用于对普通硅酸盐水泥水化的研究,建立电化学参数与传统水化参数间的联系,为交流阻抗法在水泥水化研究中的应用打下基础。本文主要研究了EDTA、无水碳酸钠两种调凝剂对普通硅酸盐水泥水化过程的影响规律,主要对其抗压强度、凝结时间、水化程度、化学收缩和水化热等水化参数进行了测定,并利用ICP对通过压榨法获得的孔溶液离子浓度进行测定,随后利用DTA-TG和XRD两种研究方法研究了EDTA和无水碳酸钠对水化产物的影响情况,在微观层面上研究EDTA和无水碳酸钠对普通硅酸盐水泥水化过程的影响,最后对EDTA、无水碳酸钠对普通硅酸盐水泥水化的作用机理进行了阐述。随后,用交流阻抗法对普通硅酸盐水泥水化过程进行了研究。首先,对掺不同调凝剂的水泥水化全过程进行了交流阻抗周期性测试,然后选用顾平提出的等效电路对测得的交流阻抗谱进行了拟合,并对获得的拟合数据进行了初步分析;在此基础上,利用交流阻抗谱获得了水泥体积电阻率,并根据电阻率变化曲线将水泥水化分成5个阶段,并进一步研究了EDTA和无水碳酸钠对水泥电阻率的影响情况。最后,本文将传统水化研究方法与交流阻抗法的测试结果进行了比较,探讨了水泥电阻率与抗压强度、凝结时间、水化程度、化学收缩及水化热等水化参数间的联系;在此基础上,欲拓展交流阻抗技术在水泥水化方面的应用范围。
[Abstract]:At present, in many cement hydration research technique, electrochemical properties of the cement setting and hardening process of promising. Based on the DC method or single frequency impedance method to study the slurry hardening process of conductivity changes lack of accuracy, separation effect and paste electrode effect can be AC impedance method, so as to eliminate the polarization response of interface, so AC impedance method can obtain more accurate and useful information. The purpose of this study is to explore the mechanism of EDTA and anhydrous sodium carbonate on Portland cement hydration process, and will be used for research on Portland cement hydration AC impedance method, establish the electrochemical parameters and the traditional water parameter relation, lay the foundation for the application of AC impedance method in study of cement hydration. This paper mainly studies EDTA, anhydrous sodium carbonate two retarder of Portland cement hydration process of the impact of regulation The law, mainly on the compressive strength, setting time, hydration degree, chemical shrinkage and hydration heat of hydration parameters were measured, and the determination of the ion concentration in pore solution obtained by pressing the ICP, followed by DTA-TG and XRD two kinds of research methods to study EDTA impact on water and anhydrous sodium carbonate the product, the effect of EDTA and anhydrous sodium carbonate on Portland cement hydration process in the micro level, at the end of EDTA, the mechanism of anhydrous sodium carbonate to Portland cement hydration were discussed. Then, the hydration process of Portland cement was studied by AC impedance method firstly. In addition, different adjustable flocculences cement hydration process of AC impedance periodic testing, then the equivalent circuit of the Gu Ping measured AC impedance spectra are fitted, and the fitting data obtained A preliminary analysis; on this basis, using the impedance spectra obtained the volume resistivity of cement, and the cement hydration is divided into 5 stages according to the resistivity curve, and further study of EDTA and anhydrous sodium carbonate cement to the resistivity. Finally, a comparison of the test results in this paper, the traditional research method and water AC impedance method, resistivity and compressive strength of cement, setting time, hydration degree, chemical shrinkage and hydration heat of hydration parameter relations; on this basis, to expand the AC impedance technology in cement hydration application.

【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ172.1
，

本文编号：1603727