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浙江大学学报(工学版)
J4  2013, Vol. 47 Issue (4): 575-580    DOI: 10.3785/j.issn.1008-973X.2013.04.002
土木工程     
基于电阻率法研究混凝土渗透性能演变规律
陈军, 金南国, 金贤玉, 洪天从
浙江大学 土木工程学系,浙江 杭州 310058
Permeability evolution of concrete by electrical resistivity measurement
CHEN Jun, JIN Nan-guo, JIN Xian-yu, HONG Tian-cong
Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China
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摘要：

将非接触式电阻率测定仪设计成新型渗透试验装置,研究混凝土渗透性能随龄期的变化规律.导电溶液贯通混凝土试件后电阻率将发生突变,利用试验装置可以直观地得到混凝土渗透完结时间.对水灰质量比为0.60、0.53、0.45,龄期为12 h、18 h、1 d、2 d、3 d、7 d、14 d、28 d的混凝土分别进行新型渗透试验,分析溶液渗透速率指标的时变规律,结合压汞法孔结构测试结果进行分析讨论.试验结果发现,在3 d之前,混凝土的渗透性急剧下降,对混凝土抗渗性不利的孔隙率显著减小；3 d之后,混凝土的渗透性先小幅回升,而后缓慢下降,最后趋于稳定.0～3 d是混凝土渗透性能较大、氯离子侵蚀的危险期.混凝土的凝胶特性使其在毛细孔连通路径封堵之后仍然保持较稳定的可渗透性.
关键词： 混凝土;  渗透性;  电阻率法;  溶液渗透速率;  孔结构    
Abstract:

A new permeability experimental device based on the NC-ERM was designed and applied to study the permeability evolution of concrete. The device showed high sensibility in detecting the percolation threshold of the penetrating solution. Thus, the critical percolating time can be easily obtained. The permeation rate of concretes with various water cement ratios was tested at the ages of 12 h, 18 h, 1 d, 2 d, 3 d, 7 d, 14 d, and 28 d, with their porosity and pore size distribution measured by MIP simultaneously. Results showed that the permeation rate of concrete slumped in the first three days, corresponding well with the notably decreasing of harmful porosity during this period|the permeability of concrete would recover slightly after 3 d, then declined in a slow rate, and leveled off finally. According to the experimental results, 0-3 d can be marked and defined as the vulnerable period for chloride ion ingression in view of the significantly greater permeability during this stage. The fact that concrete remained steadily permeable after depercolation of capillary porosity revealed the intriguing connected property of gel pores inside concrete.
Key words: concrete    permeability    electrical resistivity measurement    solution permeation rate    pore structure
出版日期: 2013-05-07
:  TU 528  
基金资助:

国家“863”高技术研究发展计划资助项目(2012AA050903)；国家自然科学基金资助项目(50838008, 51178413).
通讯作者: 金贤玉,女,教授.     E-mail: xianyu@zju.edu.cn
作者简介: 陈军（1988—）,男,博士生,从事混凝土结构耐久性的研究. E-mail: chenchangejun@zju.edu.cn
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引用本文:

陈军, 金南国, 金贤玉, 洪天从. 基于电阻率法研究混凝土渗透性能演变规律[J]. J4, 2013, 47(4): 575-580.

CHEN Jun, JIN Nan-guo, JIN Xian-yu, HONG Tian-cong. Permeability evolution of concrete by electrical resistivity measurement. J4, 2013, 47(4): 575-580.

链接本文:

http://www.zjujournals.com/xueshu/eng/CN/10.3785/j.issn.1008-973X.2013.04.002    或    http://www.zjujournals.com/xueshu/eng/CN/Y2013/V47/I4/575

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