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利用电参数反映稻壳灰水泥浆体水化过程的应用

The Application of Electrical Parameters to Reflect the Hydration Process of Cement Paste with Rice Husk Ash.

作者信息

Wang Hui, Hu Lingxuan, Cao Peng, Luo Baoxin, Tang Jing, Shi Feiting, Yu Jinyan, Li Hongjie, Jin Kaikai

机构信息

School of Civil and Environmental Engineering, Ningbo University, Ningbo 315000, China.

School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China.

出版信息

Materials (Basel). 2019 Sep 2;12(17):2815. doi: 10.3390/ma12172815.

DOI:10.3390/ma12172815
PMID:31480655
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6747981/
Abstract

This paper aims to study the electrical parameters (electrical resistivity and alternating current (AC) impedance spectroscopy) of cement paste with rice husk ash (RHA). The water to cement (Mass ratio of water to cement (w/c)) ratios of the paste in this study varied from 0.4 to 0.5. The mass ratio of rice husk ash in each w/c ratio of specimens ranged from 0% to 15% by t mass of cement. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to determine the microstructures of specimens. Moreover, the slump flow and plastic viscosity of fresh paste were determined. The results indicated that with the increasing dosage of RHA, the fluidity decreased, while the plastic viscosity increased. Meanwhile, a high w/c ratio led to a low plastic viscosity and high slump flow. The electrical resistivity of RHA cement paste gradually ascended with the increasing curing period. The conduction of specimens intricately changed by mixing RHA, a reasonable equivalent circuit was selected to describe the conduction mechanism by AC impedance spectroscopy. Additionally, the results of XRD and SEM showed that RHA could effectively promote the hydration process as well as decrease the size and number of cracks in hardened cement paste.

摘要

本文旨在研究掺稻壳灰（RHA）的水泥净浆的电学参数（电阻率和交流阻抗谱）。本研究中净浆的水灰比（水与水泥的质量比（w/c））在0.4至0.5之间变化。各水灰比试件中稻壳灰的质量比按水泥质量计在0%至15%之间。采用扫描电子显微镜（SEM）和X射线衍射（XRD）来确定试件的微观结构。此外，还测定了新拌净浆的坍落度和塑性粘度。结果表明，随着RHA掺量的增加，流动性降低，而塑性粘度增加。同时，高水灰比导致低塑性粘度和高坍落度。RHA水泥净浆的电阻率随着养护龄期的增加而逐渐上升。通过掺入RHA，试件的导电情况复杂变化，选择了合理的等效电路通过交流阻抗谱来描述导电机制。此外，XRD和SEM结果表明，RHA能有效促进水化过程，并减少硬化水泥净浆中裂缝的尺寸和数量。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0a3b/6747981/d2e9674e2d96/materials-12-02815-g011a.jpg
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