Fractal features and dynamical characters of the microstructure of paste backfill prepared from fly ash based binder

被引：0
|
作者：
Cheng H. [1 ]
Wu A. [1 ]
Wang Y. [1 ]
Wang H. [1 ]
Wang S. [1 ]
机构：
[1] Key Laboratory of Educational Ministry for High Efficient Mining and Safety in Mental Mine, University of Science and Technology Beijing, Beijing
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2016年 / 35卷
基金：
中国国家自然科学基金;
关键词：
Fly ash; Fractal dimension; Hydration reaction; Microstructure; Mining engineering; Paste backfilling;
D O I：
10.13722/j.cnki.jrme.2015.1607
中图分类号：
学科分类号：
摘要：
There are not many indicators to quantify the effect of fly ash on promoting the development of objects and enhancing strength in paste in micro scale. Based on SEM and energy spectrum analysis experiment, paste micro structure research is conducted with the help of Fractal Theory and Reaction kinetics. Results show that combination of fly ash and cement hydrated products are beneficial to promote the produce of Ettringite of expansion phase. In a certain range, with the increasing input of fly ash, the production of Ettringite phase increase correspondingly, and the micro structure of paste is more and more compact. As the Box-counting Dimension increasing, the strength of paste increase dramatically at the beginning and remain stable at last. If the fly ash contains too much calcium, the production amount of Ettringite will be excessively and the Box-counting Dimension increase and then decrease, which acts as strength deterioration in macroscopic view. The established fly ash paste hydration reaction model divides its process into dissolution period, soakage period and setting and hardening period. Based on the two courses(named crystal nucleation and crystal growth), into which the develop procedure of gel particles are analyzed, the formula of cementing crystal growth rate is obtained. © 2016, Science Press. All right reserved.
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页码：4241 / 4248
页数：7
相关论文
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