脱硫石膏-石灰-粉煤灰体系胶凝性及水化机理  

Cementitious Property and Hydration Mechanism of Desulphogypsum-Lime-Fly Ash System

作　　者：陶文宏[1,2] 刘宗明[1,2] 张明星[1] 付兴华[1,2] 

机构地区：[1]固体废物处理与资源化省部共建教育部重点实验室(西南科技大学),四川绵阳621010 [2]济南大学材料科学与工程学院,山东济南250022

出　　处：《济南大学学报（自然科学版）》2010年第3期233-237,共5页Journal of University of Jinan(Science and Technology)

基　　金：固体废物处理与资源化省部共建教育部重点实验室(西南科技大学)资助

摘　　要：通过在粉煤灰中掺加不同质量分数的脱硫石膏、石灰、NaOH、Na2SO4、煅烧脱硫石膏等研究体系的胶凝性能。结果表明:单掺脱硫石膏或煅烧脱硫石膏能提高体系的强度,最佳煅烧温度为800℃;加入石灰及NaOH碱性激发剂后,粉煤灰的活性得到激发,体系的胶凝性能明显提高。当脱硫石膏掺量的质量分数为7%、石灰为8%、NaOH为0.5%时,其28 d的抗折强度达4.19 MPa、抗压强度达16.70 MPa。在脱硫石膏、石灰、NaOH等的共同作用下,粉煤灰的水化反应加强,其主要产物为钙矾石、水化硅酸钙,体系的致密性及胶凝性能均增强。Cementitious property of desulphogypsum-lime-fly ash system was studied by mixing desulphogypsum,lime,NaOH,Na2SO4 and calcined desulphogypsum into fly ash with different ratios.The results show that the strength of the system is improved only when separately adding desulphogypsum or calcined desulphogypsum,and the best calcining temperature is 800 ℃;when the alkaline activators,lime and NaOH,are mixed into fly ash,the activity of fly ash is activated,and the cementitious property of the system is obviously improved.When the amount of desulphogypsum,lime,and NaOH is 7%,8%,and 0.5%,respectively,the flexural strength and compressive strength of fly ash reach 4.19 MPa and 16.70 MPa at 28 days.Under the joint action of esulphogypsum,lime,NaOH,the hydration reaction of fly ash is intensified,and the main hydration products,ettringite and hydrated calcium silicate,make the densification and cementitious property of the system improved.

关 键 词：脱硫石膏 激发剂 胶凝性能 水化产物 水化机理 

分 类 号：TQ177.375[化学工程—硅酸盐工业]