摘要
采用压制成型法制备了粉煤灰基地质聚合物,采用XRD与SEM-EDS测试手段研究了激发剂含量与原料质量比对地质聚合物样品显微结构与抗折强度的影响。结果表明:激发剂的质量百分比为23 wt.%时,抗折强度最大值为35.84 MPa;Na型针沸石发育程度较好,呈“芽刺状”;硅铝摩尔比为1.37,但样品的泛碱程度较大。粉煤灰与炉渣的比例对地质聚合物抗折强度的影响规律分为两段:当粉煤灰添加量小于80%时,样品的抗折强度呈递增规律,符合方程y=0.211x+19.117;当粉煤灰添加量大于80%时,样品的抗折强度呈先增后减的规律,符合方程y=0.041x^(2)-7.572x+379.617。两种原料比例为80∶20时,Na型针沸石相特征峰强度达到最大,形貌呈细直状或弯曲状,发育较佳,相互之间穿插在缝隙之中,样品抗折强度最大,近似为双硅铝链结构产物。
Fly ash based geopolymer was prepared by pressing molding method.Effect of activator content and fly ash to slag ratio on the microstructure and bending strength of geopolymers were studied by XRD,SEM and EDS.The results show that the maximum bending strength is 35.84 MPa when the activator content is 23 wt.%.Na-type zeolite phase is well developed and the morphologies appears as bud thorn with Si/Al mole ratio of 1.37 with high efflorescence degree.Influence of fly ash to slag ratio on the bending strengths of geopolymers can be divided into two sections.The bending strengths of the samples basically present an increasing trend when the fly ash contents are less than 80%and are closely consonant with the equation of y=0.211x+19.117;The bending strengths of the samples assume parabola relation when the fly ash contents are more than 80%and are are closely consonant with the equation of y=0.041x^(2)–7.572x+379.617.Na-type needle zeolite phase and trona phase appear in the microstructure of the samples.When the ratio of the two raw materials is 80:20,the intensity of the diffraction peak representing Na-type zeolite phase has the maximum value.The growth of the zeolite phase is well with the crystal morphologies of fine straight or curved filament and intersperse between each other in the microstructure.The bending strength of the sample is maximum with a double chain structure of Si-O-Al formed.
作者
丁二宝
胡海泉
曹春娥
陈云霞
徐炎
DING Erbao;HU Haiquan;CAO Chun’e;CHEN Yunxia;XU Yan(Henan Key Laboratory of Research for Central Plains Ancient Ceramics,Pingdingshan 467000,Henan,China;Jingdezhen Ceramic University,Jingdezhen 333000,Jiangxi,China;Sinoma Jiangxi Insulator and Electricity Co.,Ltd.,Pingxiang 337000,Jiangxi,China)
出处
《中国陶瓷工业》
CAS
2022年第5期17-23,共7页
China Ceramic Industry
基金
国家自然科学基金项目(51162016)
江西省科技支撑计划项目(20133BBE50004)
景德镇市科技计划项目(2017GYZD016-03)
平顶山学院高层次人才启动基金(PXY-BSQD-202111)。
关键词
粉煤灰与炉渣比
抗折强度
激发剂含量
显微结构
ratio of fuel ash to slag
bending strength
activator content
microstructure
