摘要
以粉煤灰为原料,通过碱激发的方式制备了地质聚合物凝胶材料。研究了激发剂用量、养护温度、搅拌时间、养护时间对粉煤灰地质聚合物抗压强度的影响,并采用XRD、FTIR、SEM对样品进行表征。结果表明,粉煤灰加入量为1300 g、液固比0.45、激发剂用量19%、养护温度80℃、搅拌时间15 min、养护时间16 h时,制备的粉煤灰地质聚合物28 d抗压强度最高,达到39.81 MPa。XRD和FTIR结果表明,粉煤灰在碱激发剂的作用下发生聚合反应,其中玻璃质与碱发生了解聚-缩聚反应,主要形成N-A-S-H产物,是粉煤灰地质聚合物的强度主要来源。
In this study,fly ash geopolymer was prepared through alkali activation under different alkali content,curing tem- perature,stirring time and curing .time. The compressive strengths of these samples were tested, and these samples were character- ized by XRD,FTIR,SEM. The results show that maximum strength of 39.81 MPa was obtained when 1300g of fly ash,liquid-solid ratio of 0.45, 19% of the alkali content,stirring time of 15 min,the curing temperature of 80 ℃,the curing time of 16h were used at 28th days of testing. Tile mierostruetural characteristic results investigated by XRD, FTIR showed that the depolymerization- polymerization reaction occurred between the glassiness in the fly ash and added alkali activator, the produced N-A-S-H during the polymerization was the main source of the strength of fly ash geopolymer.
出处
《新型建筑材料》
北大核心
2017年第10期12-16,共5页
New Building Materials
基金
中欧国际合作项目(SQ2013ZOG300003)
宁夏回族自治区科技支撑计划项目(2014ZYH50)
关键词
粉煤灰
地质聚合物
碱激发
抗压强度
fly ash, geopolymer, alkali activation, compressive strength
