煤气化飞灰用作水泥混合材的试验研究

Experimental Study on Coal Gasification Fly Ash as Cement Admixture

对比测试了煤气化飞灰与粉煤灰的化学成分和微观形貌、不同比例煤气化飞灰替代粉煤灰作为水泥混合材的粉体流动性,及其作水泥混合材对水泥物理化学性能的影响。分析显示,与粉煤灰相比,煤气化飞灰具有比表面积大、玻璃微珠含量高、微珠球形度高等特性;替代粉煤灰作水泥混合材时,水泥胶砂流动性、强度均提高,需水量下降,可以替代粉煤灰用作水泥混合材。

The chemical composition and micro morphology of coal gasification fly ash and fly ash,the fluidity of fly ash with different proportions of coal gasification fly ash replacing fly ash,and the effect of coal gasification fly ash as cement admixture on the physical and chemical properties of cement were tested.The test results show that compared with fly ash,coal gasification fly ash has the characteristics of large specific surface area,high content of glass beads and high sphericity of beads;Instead of fly ash as admixture,the fluidity and strength of cement mortar are improved,and the water demand is decreased.The above results show that coal gasification fly ash can replace fly ash as cement admixture.