粉煤灰膏体充填材料水化动力过程与水化机制

doi:10.13722/j.cnki.jrme.2017.1325

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Abstract

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 Krstulovi?–Dabi? 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.

Key words： mining engineering fly ash paste filling materials hydration exothermic rate hydration kinetics hydration mechanism

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	Articles by authors
	YIN Bo1
	2
	KANG Tianhe1
	KANG Jianting1
	CHEN Yuejuan1
	2
	WU Linlin1

Cite this article:

YIN Bo1,2,KANG Tianhe1, et al. The research of the hydration kinetics process and hydration mechanism of fly ash paste filling materials[J]. , 2018, 37(S2): 4384-4394.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1325 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS2/4384

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