摘要
为阐明氯化钠掺量对碱激发地聚物强度的影响和机理,以水玻璃碱激发粉煤灰基地聚物为基础,采用UCS、XRD、FTIR、SEM和物理吸附试验研究了氯化钠掺量对碱激发地聚物强度及微观结构的影响。试验结果表明氯化钠掺入碱激发地聚物中总体效果不佳;氯化钠的少量掺入会反应生成方钠石,对强度有一定的促进作用。但随着掺入量的增加,Na+离子的钝化效应导致碱激发效果下降,铝硅酸盐原料溶解受到限制,降低了地聚合反应程度;未反应的硫酸钠沉积于地聚物体系中阻碍了体系中离子迁移,并削弱了凝胶的胶结作用,致使试样中孔隙增多、孔径增大,微观结构遭到破坏,从而限制了强度的发展。
In order to clarify the effect and mechanism of sodium chloride content on the strength of alkali-activated geopolymer,the strength and microstructure of sodium silicate alkali-activated fly ash based geopolymer were characterized by UCS,XRD,FT-IR,SEM and physical adsorption tests.The experimental results show that the overall effect of sodium chloride doping in alkali-activated geopolymer was not expected.A small amount of sodium chloride doping would react to form sodalite,which could promote the strength to a certain extent.But with the increase of the doping amount,the passivation effect of Na+ions would lead to the decrease of alkali-activated effect,limiting the dissolution of aluminosilicate raw materials and the degree of polymerization reaction.The presence of unreacted sodium sulfate in the geopolymer system hindered the migration of ions in the system and weakened the cementation of the gel,resulting in the increase of pore size and pore size,and the destruction of microstructure,which limited the development of strength.
作者
吕擎峰
王子帅
陈臆
单小康
谷留杨
LYU Qingfeng;WANG Zishuai;CHEN Yi;SHAN Xiaokang;GU Liuyang(Key Laboratory of Mechanics on Western Disaster and Environment Mechanics of Ministry of Education,Lanzhou University,Lanzhou 730000,China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2020年第2期2067-2071,2092,共6页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51878322)
甘肃省重点研发计划资助项目18YF1FA112)
关键词
氯化钠
碱激发
地聚物
钝化效应
微观结构
sodium chloride
alkali-activated
geopolymer
passivation effect
microstructure
作者简介
通讯作者: 吕擎峰(1971-),E-mail:lvqf@lzu.edu.cn,男,甘肃会宁人,博士,教授,主要从事岩土工程材料方面的研究。
