流化床锅炉飞灰活性激发与建材利用的试验研究
Study on the activation of activity of CFB boiler fly ash and utilization in building materials
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摘要: 流化床锅炉飞灰活性较差，常规的粉煤灰活性激发方法对该飞灰效果不佳。本研究采用了加入适当激发剂的方法激发其活性，结果表明，加入激发剂后水泥胶砂的早期抗折、抗压强度均有100%的增长，后期抗折强度提高约100%、抗压强度提高60%以上，凝结时间和安定性均符合要求。水泥中飞灰掺量达40%时，其胶砂各龄期强度均达到甚至超过了42.5R水泥的强度；飞灰掺量65%～75%时，胶砂强度显示仍可生产一些低强度要求的建材产品，如砌筑水泥、建筑砂浆等。采用XRD、SEM等微观测试手段对飞灰活性激发机理进行了探讨。Abstract: As the activity of CFB fly ash is lower, the routine methods of activation of activity of fly ash are not appropriate for CFB fly ash. The methods of activation of activity of CFB fly ash were studied. The results show that if addition of activator is proper, early strength of cement tensile is increased by 100% and later strength of cement tensile is increased by 60%. The setting time and soundness of samples accord with request. As addition of ash is 40%, the strength of all age surpass the tensile strength of 42.5R cement. As addition of ash is 65%～75%, the building materials of lower strength,for example masonry cement and building mortar, can be produced. The activation mechanism of activity of CFB fly ashes is analyzed by XRD and SEM.
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