硅酸盐通报2025，Vol.44Issue(12)：4375-4383,9.DOI:10.16552/j.cnki.issn1001-1625.2025.0593
固体复合激发剂制备单组份地聚合物
One-Part Geopolymer Prepared by Solid Composite Activator
摘要
Abstract
Sodium silicate solution is commonly used as a liquid activator for geopolymer preparation,but its high alkalinity,high viscosity,and it is not conducive to the on-site mixing and preparation of geopolymer slurry.In this study,a one-part geopolymer was synthesized using solid composite activators including NaOH,Ca(OH)2,and Na2CO3 to co-activate fly ash-slag blends.The influences of alkalinity and fly ash content on the fluidity of fresh paste and the compressive strength of hardened binder were systematically investigated.The hydration products and microstructure were characterized using X-ray diffraction(XRD),thermogravimetric analysis(TG),scanning electron microscopy(SEM)and pore structure analysis.The results indicate that with the increase of fly ash content,paste fluidity increases,setting time prolongs,and compressive strength decreases.The highest 28 d compressive strength(48.8 MPa)is achieved at 6％(mass fraction)alkalinity and 20％(mass fraction)fly ash content.Higher activator alkalinity enhances the degree of alkali-activation reaction,promotes Ca2+ions leaching from slag,increases the Ca/Si molar ratio of sodium-containing calcium aluminosilicate hydrate(C-(N)-A-S-H)gel phase,and reduces the total porosity to obtain a denser microstructure.An increase in fly ash content decreases the reaction degree,lowers the Ca/Si molar ratio and significantly increases the total porosity.关键词
单组份地聚合物/固体复合激发剂/流动度/凝结时间/抗压强度/微观结构Key words
one-part geopolymer/solid composite activator/fluidity/setting time/compressive strength/microstructure分类
建筑与水利引用本文复制引用
WANG Zhanpeng,WANG Xin,QI Le,HU Ping,YANG Tao,ZHUANG Peizhi..固体复合激发剂制备单组份地聚合物[J].硅酸盐通报,2025,44(12):4375-4383,9.基金项目
国家重点研发计划项目(2022YFC3005600) （2022YFC3005600）
国家自然科学基金青年基金(51702278) （51702278）
江苏省自然科学基金青年基金(BK20170476) （BK20170476）
