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首先通过机械研磨方式对生物质电厂焚烧飞灰(以下简称生物质灰)进行改性;其次研究了不同生物质灰的化学成分、微观形貌、粒度分布特性,开展了不同掺量替代水泥胶砂强度试验,最后考察了生物质灰的潜在胶凝活性。结果表明,研磨处理明显改善了生物质灰的粒度分布及微观形态;宏观上反应为高硅型生物质灰用于水泥掺合料表现出了较高的火山灰活性。经过研磨处理的低硅灰在胶砂试件中等量替代水平下,改性低硅型生物质灰与Ⅱ级粉煤灰强度贡献水平相当,粒度分布、SEM图像观察结果与其胶砂试件的强度发展规律基本一致。就强度试验结果而言,高硅型和低硅型生物质灰分别可替代SF85微硅粉、Ⅱ级粉煤灰在水泥制品中得到应用。
Firstly, the biomass power plant incineration fly ash (hereinafter referred to as biomass ash) was modified by mechanical grinding. Secondly, the chemical composition, microstructure and particle size distribution of different biomass ash were studied, Sand strength test, and finally investigated the potential gelling activity of biomass ash. The results showed that the grinding treatment significantly improved the particle size distribution and microstructure of biomass ash. Macroscopically, the response of high silica type biomass ash to cement admixture showed higher activity of pozzolana. The low silica fume with the same level of substitution in the mortar showed that the modified silica fume possessed the same level of strength as Grade Ⅱ fly ash. The results of particle size distribution and SEM images were in good agreement with those of the mortar Strength of the law of development is basically the same. In terms of strength test results, high silicon type and low silicon type biomass ash can replace SF85 micro-silica fume respectively, and grade II fly ash has been applied in cement products.