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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第3期    总第271期    2017年3月

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文章编号:1672-7207(2017)03-0761-08
基于微环境温湿度的混凝土孔隙水饱和度预计
鲁彩凤1, 2,张艳龙3,姬永生1, 2,蒋建华4

(1. 中国矿业大学 深部岩土力学与地下工程国家重点实验室,江苏 徐州,221116;
2. 中国矿业大学 江苏省土木工程环境灾变与结构可靠性重点实验室,江苏 徐州,221008;
3. 徐州原土建筑设计有限公司,江苏 徐州,221008;
4. 河海大学 土木与交通学院,江苏 南京,210098
)

摘 要: 研究混凝土微环境相对湿度、温度及微观结构对孔隙水饱和度的影响机理,并通过恒定人工气候环境下粉煤灰混凝土孔隙水饱和度的测定进行验证,建立基于混凝土微环境影响的孔隙水饱和度预计模型。研究结果表明:粉煤灰混凝土水胶比越小,其孔隙水饱和度越大;粉煤灰混凝土孔隙水饱和度随微环境相对湿度的提高而增大,随微环境温度的升高而下降;恒定微环境温湿度情况下,当粉煤灰掺量不超过15%时,混凝土孔隙水饱和度随粉煤灰掺量的增大而增大,但粉煤灰掺量超过15%时,其随粉煤灰掺量的增大而降低。粉煤灰混凝土孔隙水饱和度与微环境相对湿度、微环境温度、粉煤灰掺量和水胶比之间的关系可以用指数函数较好地拟合。

 

关键字: 孔隙水饱和度;微环境温度;微环境湿度;粉煤灰混凝土;水胶比

Prediction of pore water saturation based on micro-environment temperature and relative humidity in concrete
LU Caifeng1, 2, ZHANG Yanlong3, JI Yongsheng1, 2, JIANG Jianhua4

1. State Key Laboratory for Geomechanics & Deep Underground Engineering,
China University of Mining & Technology, Xuzhou 221116, China;
2. Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering,
China University of Mining & Technology, Xuzhou 221008, China;
3. Xuzhou Yuantu Architectural Design Co. Ltd., Xuzhou 221008, China;
4. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China

Abstract:The effect mechanism of micro-environment temperature, relative humidity and microstructure on pore water saturation of fly ash concrete was studied, and was verified through measuring pore water saturation of fly ash concrete in constant artificial climate conditions, and then the prediction model of pore water saturation based on micro-environment temperature and humidity was established. The results show that water-binder ratio of fly ash concrete is smaller, and the pore water saturation is higher. Pore water saturation of fly ash concrete increases with the increase of micro-environment relative humidity, but decreases with the increase of micro-environment temperature. The pore water saturation in concrete increases with fly ash replacement at constant micro-environment temperature and under humidity conditions when fly ash replacement is less than 15%, but the pore water saturation decreases with fly ash replacement that is more than 15%. The relationship between pore water saturation in fly ash concrete and parameters (including micro-environmental relative humidity, temperature, fly ash content and water to binder ratio) can be fitted by an exponential function.

 

Key words: pore water saturation; micro-environment temperature; micro-environment relative humidity; fly ash concrete; ratio of water to binder

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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