[1]肖海军,孙伟,蒋金洋,等.水泥基材料微结构的反复压汞法表征[J].东南大学学报(自然科学版),2013,43(2):371-374.[doi:10.3969/j.issn.1001-0505.2013.02.027]
 Xiao Haijun,Sun Wei,Jiang Jinyang,et al.Characterization of microstructure of cement-based materials by multi-cycle-MIP method[J].Journal of Southeast University (Natural Science Edition),2013,43(2):371-374.[doi:10.3969/j.issn.1001-0505.2013.02.027]
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水泥基材料微结构的反复压汞法表征()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
43
期数:
2013年第2期
页码:
371-374
栏目:
材料科学与工程
出版日期:
2013-03-20

文章信息/Info

Title:
Characterization of microstructure of cement-based materials by multi-cycle-MIP method
作者:
肖海军孙伟蒋金洋王彩辉
东南大学材料科学与工程学院, 南京211189; 东南大学江苏省土木工程材料重点实验室, 南京211189
Author(s):
Xiao Haijun Sun Wei Jiang Jinyang Wang Caihui
School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, China
关键词:
水泥基材料 多次进汞 孔隙特征 有效孔隙率
Keywords:
cement-based materials repeated mercury intrusion pore characteristics effective porosity
分类号:
TU528
DOI:
10.3969/j.issn.1001-0505.2013.02.027
摘要:
为了获得水泥基材料真实的微结构特征,采用反复压汞法来消除墨水瓶效应的影响.针对不同的工况,研究了水泥细度对水泥石微结构的影响.实验结果表明:由具有不同细度水泥制成的水泥石在第1次进汞时,其压汞曲线上均存在与毛细孔和凝胶孔相对应的2个峰值.反复压汞时,毛细孔峰高下降,孔径和峰宽变大;而凝胶孔仅峰高下降,峰值与峰宽变化不大.对于比表面积为1.19和1.78 m2/g的水泥制成的水泥石,反复压汞法可以有效表征其孔结构参数,有效孔隙率为65%~80%;而对于比表面积为1.95和2.24 m2/g的水泥制成的水泥石,采用反复压汞法不能得到水泥石的有效孔隙率.水泥比表面积较小时,可以运用二次或多次压汞的方法将有效孔隙和墨水瓶效应孔隙区分开来;毛细孔和凝胶孔中均存在墨水瓶效应.
Abstract:
In order to obtain real microstructure features of cement-based materials, multi-cycle-MIP(mercury intrusion porosimetry)method was performed to eliminate the effect of ink-bottle type pores. Under different conditions, the influence of cement fineness on the pore structure of cement paste was studied. The experimental results show that the curve of the pressure mercury of cement paste made of cement with different fineness have two peaks through the first intrusion mercury, and the peaks are corresponding to capillary pore and gel pore, respectively. When repeated intrusion mercury is performed, the height of the capillary pore peak decreases, and the aperture and the width of peak become larger. However, for the gel pore, the aperture and the width are almost unchanged while the height of the peak decreases. By using the multi-cycle-MIP method, the parameters of pore structures of cement paste made of cement with specific surface area of 1.19 and 1.78 m2/g can be properly represented, and the corresponding effective porosity is 65%-80%. However, for cement paste made of cement with specific surface area of 1.95 and 2.24 m2/g, this method fails. When the specific surface area is small, effective porosity and ink bottle porosity can be separated by using repeated MIP method. The ink bottle effect exists in both capillary pores and gel pores.

参考文献/References:

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备注/Memo

备注/Memo:
作者简介: 肖海军(1989—),男,硕士生;孙伟(联系人),女,教授,博士生导师,中国工程院院士,sunwei@seu.edu.cn.
基金项目: 国家重点基础研究发展计划(973计划)资助项目(2009CB623203)、国家自然科学基金资助项目(51078081).
引文格式: 肖海军,孙伟,蒋金洋,等.水泥基材料微结构的反复压汞法表征[J].东南大学学报:自然科学版,2013,43(2):371-374. [doi:10.3969/j.issn.1001-0505.2013.02.027]
更新日期/Last Update: 2013-03-20