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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。
Fly ash in the promotion of paste slurry phase growth and strength of the lack of micro-quantitative indicators. The microstructure of the paste was analyzed by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), combining with the fractal theory and reaction kinetics. The results show that the combination of fly ash and cement hydration products is helpful to promote the formation of expansive phase ettringite. Within a certain range, the fly ash increased, the ettringite phase increased, the microstructure was compact, and the intensity tended to be stable with the increase of total box dimensions. When the calcium content in fly ash is too high, ettringite is excessively formed, the box dimension first increases and then decreases, and on the macroscopic scale, the intensity deteriorates. The established hydration kinetics model of the fly ash paste divides the hydration process into dissolving, infiltrating, and setting-hardening phases, and decomposes the development of the gel particles into two processes of nucleation and crystal growth. Out of the gel crystal growth rate formula.