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硬化水泥浆体体积电阻和孔结构的关系
作者:安晓鹏1 史才军1 2 曹张2 王德辉2 何富强3 胡张莉2 
单位:1.绿色建材国家重点实验室 中国建筑材料科学研究总院 北京100024  2.湖南大学土木工程学院 长沙410082  3.厦门理工学院土木工程与建筑系 福建厦门361024 
关键词:硬化水泥浆体 交流阻抗 体积电阻 连通孔隙 非连通孔隙 
分类号:
出版年,卷(期):页码:2014,42(8):1011-1017
DOI:10.7521/j.issn.0454-5648.2014.08.09
摘要:

用交流阻抗技术研究了硬化硅酸盐水泥浆体体积电阻和孔结构的变化特征。结果表明:硬化水泥浆体的体积电阻在前7d增长迅速,7d龄期时,体积电阻已经达到了总电阻的60%~70%,水灰比对体积电阻增长率的影响也主要体现在前7d。根据硬化水泥浆体中连通孔隙和闭合孔隙的特点,提出了硬化水泥浆体固、液相的串并连模型,建立了体积电阻与水泥硬化浆体中连通孔隙和非连通孔隙的关系。基于该模型和压汞法测试的总孔隙率的计算表明:当孔隙率接近20%时,闭合孔隙在总孔隙中所占的比例急速提高;当孔隙率大于25%时,连通孔隙所占的比例明显增大。

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 The characteristics of bulk resistance and pore structure of hardened Portland cement pastes were investigated by alternating current (AC) impedance spectroscopy. The results indicate that the bulk resistance increases rapidly during the initial 7d hydration, then the increased rate decreases afterwards. The water-cement ratio has an effect on the bulk resistance before 7d hydration. At the age of 7d, the bulk resistance was up to 60%-70% of it at the latest measured age. Based on the conductive characteristics of solid, liquid of cement paste and connected pores and blocked pores in handed cement paste, a series-parallel model was proposed to simulate the electrical conduction of handed cement paste. The proportions of connected and blocked pores were estimated by the similated data by the model and the measurement results of total porosity. It is indicated that the proportion of blocked pores increases rapidly when the porosity of cement paste is 20%. Also, the proportion of connected pores increases significantly when the porosity is > 25%.

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基金项目:
中国建筑材料集团有限公司《尾窑钢渣直接外加法生产水泥技术》支助项目。
作者简介:
第一作者:安晓鹏(1988—),男,硕士,助教。 通信作者:史才军(1963—),男,教授。
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参考文献:

参考文献:
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