粉煤灰–水泥基膏体微观结构分形表征及动力学特征

doi:10.13722/j.cnki.jrme.2015.1607

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摘要粉煤灰在促进膏体料浆物相发育及强度增长方面缺乏微观量化指标。通过电镜扫描和能谱分析实验，同时结合分形理论和反应动力学对膏体微观结构进行分析。结果表明：粉煤灰与水泥水化产物结合有利于促进膨胀相钙矾石的生成。在一定范围内，粉煤灰增加，钙矾石相增多，微观结构密实，强度随计盒维数先大幅增长后趋于稳定。当粉煤灰中钙含量过高时，钙矾石过量生成，盒维数表现为先增大后减小，宏观上则表现出强度劣化现象。建立的粉煤灰膏体水化动力学模型将水化过程划分为溶解期、浸润期和凝结硬化期，将凝胶颗粒的发育分解为晶体核化和晶体生长两个过程，并据此求出了凝胶晶体速率增长公式。

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	程海勇
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关键词 ：采矿工程, 膏体充填, 粉煤灰, 分形维数, 水化反应, 微观结构

Abstract：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.

Key words： mining engineering paste backfilling fly ash fractal dimension hydration reaction microstructure

引用本文:

程海勇，吴爱祥，王贻明，王洪江，王少勇. 粉煤灰–水泥基膏体微观结构分形表征及动力学特征[J]. 岩石力学与工程学报, 2016, 35(S2): 4241-4248.
CHENG Haiyong，WU Aixiang，WANG Yiming，WANG Hongjiang，WANG Shaoyong. Fractal features and dynamical characters of the microstructure of paste backfill prepared from fly ash based binder. , 2016, 35(S2): 4241-4248.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.1607 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS2/4241

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