粉煤灰膏体充填材料水化动力过程与水化机制  

The research of the hydration kinetics process and hydration mechanismof fly ash paste filling materials

作　　者：尹博[1,2,3] 康天合 康健婷[1] 陈月娟[1,2] 毋林林 YIN Bo;KANG Tianhe;KANG Jianting;CHEN Yuejuan;WU Linlin(Institute of Mining Technology,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;School of Mining and Technology,Inner Mongolia University of Technology,Hohhot,Inner Mongolia 010051,China)

机构地区：[1]太原理工大学采矿工艺研究所,山西太原030024 [2]内蒙古工业大学矿业学院,内蒙古呼和浩特010051 [3]河北工程大学

出　　处：《岩石力学与工程学报》2018年第A02期4384-4394,共11页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51174141,50974093)~~

摘　　要：明确粉煤灰膏体充填材料的水化动力学特性及胶结过程演变机制,有助于剖析充填材料早期强度低、变形量大及泌水严重等缺陷存在的原因,进而为科学调控充填材料结构形成过程和合理制定充填工艺参数提供指导。本文采用TAMAir等温微量热仪测定充填材料的水化放热速率和放热量,基于Krstulovic-Dabic水化动力学模型,计算充填材料的水化动力学参数,对水化动力过程各阶段的变化特征进行分析。利用水泥水化建模软件模拟了充填材料在不同水化程度下的水化过程,并对水化机制作进一步解释。结果表明:充填材料水化动力过程可通过结晶成核与晶体成长(NG)、相边界反应(I)和扩散(D)进行描述。水化初期NG过程控制水化反应的进程,随着水化程度的提高逐渐转变为由I过程和D过程控制。与纯水泥水化动力过程变化特征相比,充填材料水化动力过程的转变则需要更高的水化反应程度。水化过程模拟结果为描述和探讨粉煤灰充填材料的水化特征与微结构演变提供了有益参考。通过对粉煤灰膏体充填材料水化机制的研究,揭示了充填材料结构及其形成过程的一般规律。Accurately understand the changing rules of hydration kinetic process and hydration mechanism of fly ash paste filling materials will help to analyze the reasons for the low early strength,large deformation and severe bleeding,and then to control the formation process of the filling material structure,as well as to give a reasonable process parameters.In this study,the micro heat flow and hydration heat of fly ash paste filling materials were tested by used TAM Air Isothermal Calorimater.The hydration kinetics parameters were calculated based on Krstulovic-Dabic model.The characteristics of hydration kinetic process at different stages were analyzed.The cement hydration modeling software was used to simulate the hydration process of filling materials under different degree of hydration and the hydration mechanism of fly ash paste filling materials was further discussed.The results showed that the hydration kinetic process of fly ash paste filling materials can be described by three processes:nucleation and crystal growth(NG),interactions at the phase boundaries (I)and diffusion (D).NG process dominates in the early stage of hydration,I process and D process becomes the dominating factor gradually as the hydration degree increases.Compared with cement,the hydration kinetic process change requires a higher degree of hydration when the mixture of fly ash and coal gangue.The simulation of degree of hydration results provided a useful reference for describing and discussing the hydration characteristics and microstructure evolution.Through the description of hydration mechanism of fly ash paste filling material,the general rules of filling material structure and its forming process are clarified.The results are instructive to promote the research and development of fly ash paste filling materials.

关 键 词：采矿工程 粉煤灰膏体充填材料 水化放热速率 水化动力学 水化机制 

分 类 号：TD32[矿业工程—矿井建设]