超低离子渗透性水泥基材料的组分及其结构与性能

来源期刊:中南大学学报(自然科学版)2009年第1期

论文作者:王信刚 马保国 李相国

文章页码:145 - 152

关键词:水泥基材料;抗离子渗透性能;寿命预测;界面过渡区

Key words:cementitious materials; chloride ion penetration resistance; service life prediction; interfacial transition zone

摘    要:采用加速扩散法测试超低离子渗透性水泥基材料(ULIPCM)的离子传输性能,采用显微硬度、压汞法(MIP)、扫描电镜-能谱仪(SEM-EDXA)研究其微观结构,提出ULIPCM的界面过渡区结构模型。结果表明:ULIPCM的Cl-扩散系数≤0.8×10-13 m2/s,6 h导电量≤300 C;与高性能混凝土(HPC)相比,ULIPCM的Cl-扩散系数下降1~2个数量级,6 h导电量下降约40%,ULIPCM的Cl-渗透性能非常低;ULIPCM用作海洋工程结构混凝土保护层时,其厚度≥1.5 cm。ULIPCM的集料与水泥石界面过渡区的微观结构和性能得到显著改善,有利于提高其抗渗性能,尤其是ULIPCM的集料与水泥石界面过渡区由传统混凝土的60~100 μm细化为30 μm以下,从而有效地阻断侵蚀性介质的渗入通道。

Abstract: Ion transport property of ultra low ion permeability cementitious materials (ULIPCM) was investigated by accelerated diffusion method, and the microstructure of ULIPCM was investigated by microhardness, MIP and SEM-EDXA. The structure model of interfacial transition zone between aggregate and cement paste of ULIPCM was put forward. The results show that the chloride diffusion coefficient of ULIPCM is lower than 0.8×10-13 m2/s, and conductive charge for 6 h is lower than 300 C. Compared with high performance concrete, the chloride diffusion coefficient decreases by one to two orders of magnitude by means of rapid chloride diffusivity test (NEL), and the conductive charge for 6 h approximately decreases by 40% by means of the rapid chloride permeability test method as designated in ASTM C1202. Thus, the impermeability of ULIPCM is obviously improved. The thickness of ULIPCM will be over 1.5 cm when it is used for concrete cover in marine engineering structure. The microstructure and micro-performance of ULIPCM are obviously improved. Especially, compared with ordinary concrete whose thickness of interfacial transition zone is 60 to 100 μm, the thickness of interfacial transition zone of ULIPCM is lower than 30 μm. Penetration paths to corrosive medium are effectively interdicted in ULIPCM.

基金信息:国家“863”计划资助项目
江西省教育厅青年科学基金资助项目

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