硅酸盐学报

用电阻率法确定混凝土结构形成的发展阶段及结构形成动力学参数

作者：魏小胜1 肖莲珍2

单位：1. 华中科技大学土木工程与力学学院武汉 430074 2. 武汉工程大学材料科学与工程学院武汉 430073

分类号：TQ178

出版年,卷(期):页码：2013,41(2):171-179

DOI：

摘要：

摘要：测定和分析了水灰比为0.4和0.5的不同骨料掺量(Va)的混凝土早龄期(24 h)水化期间电阻率发展的特性。根据电阻率微分曲线上的特征峰值点将混凝土分为：溶解和结晶期、诱导和凝结期、硬化加速期、硬化减速期4个结构形成发展阶段。相同水灰比、不同骨料掺量的混凝土电阻率微分曲线上的前2个特征峰值点对应的时间几乎相等，骨料含量高(Va = 70%)的混凝土的第3个特征峰值点对应的时间延长，这与其界面过渡区面积较大有关。不同水灰比、相同骨料掺量的混凝土的电阻率微分曲线表明，水灰比为0.4时混凝土的3个特征峰值点对应的时间都提前，这与低水灰比基体材料的结构密实速度较快有关。混凝土电阻率随时间对数的发展在硬化后表现出线性关系，混凝土电阻率时间对数曲线斜率越大，说明单位体积混凝土中的骨料量较多，或者净浆基体的水泥颗粒较多。

Abstract: The electrical resistivity of concretes with various aggregate volume fractions (Va) at water-cement ratios of 0.4 and 0.5 during 24 h were analyzed. The different structure formation periods are dissolution and precipitation period, induction and setting period, accelerating period, and decelerating period, which are identified from the three critical peak points on the differential electrical resistivity curve. The durations at which the first two peaks occurred were similar, and the third point, which was caused by a larger transitional zone to be filled for a higher Va used, was delayed. The time to reach the same critical point on the differential electrical resistivity curve was earlier for a lower water-cement ratio concrete when the same Va was used. A logarithmic equation was proposed to predict the electrical resistivity development with time after hardening period, and the physical meaning of parameter Kc was the slope of electrical resistivity for concrete system after hardening. Kc is a function of its aggregate volume and the slope of its matrix paste in a concrete. The higher aggregate volume and more cement particles in unit volume concrete both can result in a higher rate of electrical resistivity development of concrete.

基金项目：

国家自然科学基金(No.51178202)资助项目。

作者简介：

第一作者：魏小胜(1964—)，男，博士，教授。通信作者：肖莲珍(1965—)，女，博士，教授。

参考文献：

参考文献：
[1] 袁润章. 胶凝材料学[M]. 武汉: 武汉理工大学出版社, 1989, 94–95.
YUAN Runzhang. Science of Cementitious Materials [M]. Wuhan: Press of Wuhan University of Technology, 1989: 94–95.
[2] WHITTINGTON H W, MCCARTER J, FORDE M C. The Conduction of Electricity through Concrete [J]. Mag Concr Res, 1981, 33(114): 48–60.
[3] XIAO Lianzhen, WEI Xiaosheng, LI Zongjin. Concrete Hydration Based on Electrical Resistivity Measurement//VDM Verlag Dr. Muller Aktiengesellschaft & Co. KG, Saarbruchen, Germany, 2008.
[4] 马保国, 董荣珍, 张莉, 等. 硅酸盐水泥水化初始结构形成及发展[J]. 武汉理工大学学报, 2004, 25(7): 18–211.
MA Baoguo, DONG Rongzhen, ZHANG Li, et al. J Wuhan Univ Technol (in Chinese), 2004, 25(5): 18–211.
[5] 隋同波, 曾晓辉, 谢友均, 等. 电阻率法研究水泥早期行为[J]. 硅酸盐学报, 2008, 36(4): 431–436.
SUI Tongbo, ZENG Xiaohui, XIE Youjun, et al. J Chin Ceram Soc (in Chinese), 2008, 36(4): 431–436.
[6] XIAO Lianzhen, LI Zongjin. Early-age hydration of fresh concrete monitored by non-contact electrical resistivity measurement [J]. Cem Concr Res, 2008, 38(3): 312–319.
[7] WEI Xiaosheng. Interpretation of hydration process of cement-based materials using electrical resistivity measurement [D]. Hong Kong University of Science and Technology, Hong Kong, 2004.
[8] 马红岩. 海砂对水泥基材料水化行为及护筋性能的影响研究[D]. 深圳大学, 2008.
MA Hongyan. The influence of sea sand on the hydration behavior of cement-based materials and the properties of steel protection [D]. Shenzhen University, Shenzhen, 2008.
[9] 洪天从. 基于电阻率法的混凝土水化进程和渗透性能演变规律研究[D]. 浙江大学, 2012.
HONG Tiancong. Study on hydration process and permeability evolution of concrete by electrical resistivity [D]. Zhejiang University, Zhejiang, 2012.
[10] LI Zongjin, LI Wenlai. Contactless, transformer-based measurement of the resistivity of materials. US Patent 6639401, 2003.
[11] LI Zongjin, WEI Xiaosheng, LI Wenlai. Preliminary Interpretation of Hydration Process of Portland Cement Using Resistivity Measurement [J]. ACI Mater J, 2003, 100(3): 253–257.
[12] 魏小胜, 肖莲珍. 电阻率法测定硅酸盐水泥水化活化能[J]. 硅酸盐学报, 2011, 39(4): 676–681
WEI Xiaosheng, XIAO Lianzhen. J Chin Ceram Soc, 2011, 39(4): 676–681.
[13] 阎培渝, 郑峰. 水泥基材料的水化动力学模型[J]. 硅酸盐学报, 2006, 34(5): 555–559.
YAN Peiyu, ZHENG Feng. J Chin Ceram Soc, 2006, 34(5): 555–559.
[14] WEI X, LI Z. Study on hydration of Portland cement with fly ash using electrical resistivity measurement [J]. Mater Struct, 2005, 38(277): 411–417.
[15] ABO EL-ENEIN S A. et al. Electrical resistivity of concrete containing silica fume [J]. Cem Concr Res, 1995, 25(8): 1615–1620.
[16] 肖莲珍, 李宗津, 魏小胜. 用电阻率法研究新拌混凝土的早期凝结和硬化[J]. 硅酸盐学报, 2005, 33(10): 1271–1275.
XIAO Lianzhen, LI Zongjin, WEI Xiaosheng. J Chin Ceram Soc, 2005, 33(10): 1271–1275.
[17] XIAO Lianzhen, LI Zongjin. New understanding of cement hydration mechansim through electrical resistivity measurement and microstructure investigation [J]. J Mater Civ Eng, 2009, 21(8): 368–373.
[18] YE G, van BREUGEL K, FRAAIJ A L A. Three-dimensional microstructure analysis of numerically simulated cementitious materials [J]. Cem Concr Res, 2003, 33(2): 215–222.

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