
2011NO.1 学变题研究
粉煤灰综合利用
FLY ASH COMPREHENSIVE UTILIZATION
乙二醇与硫酸钠复合对粉煤灰火山灰活性影响的研究
Study on the Effect of Glycol Sodium Sulfate Compound on the Pozzolanic Activity of Fly Ash
叶东忠,王成勇,林春莺
(福州大学材料科学与工程学院,福建福州350108)
摘要:探讨乙二醇与硫酸钠复合对粉煤灰不同时期火山灰活性的影响。结果表明:将一定掺量的乙二醇与硫酸钠复合掺人可以不同程度地提高粉煤灰早期、中期与后期的火山灰活性,其中早期的激发作用效果最大,后期的激发作用效果最小。且随着粉磨时间的延长,各水混试样的3d、7d及28d抗压强度比值均有明显的提高但增幅下降。无论是否粉磨及粉糜时间长矩,将一定掺量的乙二醇与硫酸钠复合对粉煤灰不同时期火山灰活性的激发作用效果均优于单掺乙二醇或硫酸钠:当硫酸钠掺量为1%,乙二醇掺量为0.03%进行复掺且粉磨时间15min时其对粉煤灰不同时期火山灰活性的激发作用效果最大。
关键词:乙二醇;硫酸钠;粉煤灰;火山灰活性
中图分类号:TQ172.715
文献标识码:A
文章编号:1005-8249(2011)01-0006-05
YE Dong-zhong, WANG Cheng-yong,LIN Chun-ying
(College of Materials Sciences and Engineering, Fuzhou University, Fuzhou, Fujian 350108,china)
Abstract: The effect of ethylene glyeol combined with sodium sulfate on the pozzolanice activity of fly ash in diferent stage were investigated. The results show that the pozzolanic activity of fy ash at the earty stage ,the middle stage and the later stage can be improved in different extent by adding proper content of ethylene glyeol combined with sodium sulfate to cement. The exciting efeet of ethylene glyeol combined with sodium sulfate in the early stage is the best and that in the later stage is the worst. The compressive strength ratio at 3d , 7d and 28d of each cement sample can be improved obviously , but the increasing rste of thoe of each cement sample are reduced with the increasing of grinding time, Whether each cement sample is grinded or nor and how long grinding time is, the exciting effect of ethylene glyeol combined with sodium sulfate in diferent stage is beter than that of ethylene glyeol or sodium sulfate, When the eontent of1% sodium sulfate and O.03% ethylene glyeol is admixed and grinding time is 15 minutes,the exciting efect of ethylene glyeol combined with sodium sufate on the pozolanic activity of fly ash in diferent stag is the best.
Key words ; ethylene glyeol;sodium sulfate;fly ash; poczolanie activity
粉煤灰是我国目前排放量最大的燃煤副产品之一,但我国目前粉煤灰的利用率不高,因此,提高粉煤灰的利用率仍将是很艰巨的任务。粉煤灰作为水泥、混凝土掺合料用于土木、水利和海洋等工程领域是目前国内外粉煤灰利用的主要途径,取得了不少成果[13]。从化学组成上看,粉煤灰是一种典型的火山灰质材料,粉煤灰的很多工程应用都是建立在对粉煤灰这种潜在的火山灰性质的利用上,因此火山灰性质是粉煤灰最基本的性质4),但一般情况下,粉煤灰的火
"基金项目:福建省教育厅科研资助项目(JA10050)作者简介:叶东忠(1967-),男,硕士,副教授
收稿日期:2010-11-30·6·
万方数据
山灰活性发挥速度较慢,为提高粉煤灰的火山灰活性常采用下列两种方法:其一是化学激发,即掺人激发剂;其二是物理激发,即掺人助磨剂进行粉磨,在激发剂或助磨剂的激发作用下,粉煤灰的火山灰活性可以明显提高[5]。目前国内学者对于激发剂或助磨剂对粉煤灰火山灰活性激发效果的研究较多,但对于激发剂与助磨剂复合对粉煤灰火山灰活性激发效果的研究较少。本研究将作为激发剂的硫酸钠与作为助磨剂的乙二醇复合,探讨其对粉煤灰不同时期火山灰活性激发效果的影响,并从中优选出能够提高粉煤灰火山灰活性的最佳复合掺量,为激发剂与助磨剂的合理复合选用提供参考依据。