脱硝粉煤灰对水泥性能影响的研究  被引量:30

Investigation on the effect of denitrified fly ash on the properties of cement

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作  者:王穆君 徐玲玲[2] 刘方[2] 汪洋[2] 叶强 杨尚富 刘韬 

机构地区:[1]浙江天达环保股份有限公司,浙江杭州310006 [2]南京工业大学材料学院,江苏南京210009

出  处:《新型建筑材料》2011年第6期12-14,58,共4页New Building Materials

摘  要:脱硝粉煤灰是火电厂采用脱硝工艺减少NOx气体排放时的固体副产物,随着脱硝工艺的普及,脱硝粉煤灰将成为主要的粉煤灰种类,因此其综合利用具有重大的实际意义。主要研究了3种采集自不同电厂的脱硝粉煤灰以10%、20%、30%和40%掺入水泥中对水泥性能的影响,结果表明,脱硝粉煤灰对水泥性能的作用类似于普通粉煤灰,具有一定的减水作用,提高了水泥的流动度,但延长了水泥的凝结时间,并降低了水泥的早期强度,这些作用随着粉煤灰掺量的增加而增强。在设计粉煤灰掺量时必须考虑粉煤灰中CaO的含量,以保证水泥的安定性合格。Denitrified fly ash is a solid by-product of thermal power plant denitrification process used to reduce NOx emissions. With the popularizing of this technique in power plant,fly ash produced by low-NOx combustion will be the major type of fly ash. Therefore,its comprehensive utilization has practical significance. In this paper three samples of fly ash with low-NOx combustion from different power plants have been studied to replace the cement with weight percentage of 10%,20%,30% and 40%. Their effects on cement properties were tested. The results show that the effect of denitrified fly ash is nearly the same as that of ordinary fly ash. As it has certain water reducing effect,the flowability of cement is increased,setting time is prolonged and the earlier stage strength is lowered. Such effect strengtbens with the increasing of denitrified fly ash content. To ensure the stability of cement with denitrified fly ash,the CaO content in denitrified fly ash should be considered when determining the percentage of fly ash adding into cement.

关 键 词:脱硝粉煤灰 水泥 安定性 

分 类 号:X773[环境科学与工程—环境工程]

 

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