风化
偏高岭土
材料科学
聚合物
浸出(土壤学)
硅酸盐
硅酸钠
溶解
收缩率
复合材料
化学工程
矿物学
化学
粉煤灰
环境科学
土壤水分
土壤科学
工程类
作者
Márlon A. Longhi,Erich D. Rodríguez,Brant Walkley,Zuhua Zhang,Ana Paula Kirchheim
标识
DOI:10.1016/j.compositesb.2019.107671
摘要
The efflorescence formation in metakaolin-based geopolymers is assessed in this study to provide a better understanding of the effect of the synthesis parameters. Efflorescence formation depends on the physical and chemical properties of geopolymers as well as the environmental exposure conditions. In this study a set of fifteen geopolymers were synthesized using different formulation. An accelerated test of efflorescence development is presented, where the grade of degradation was evaluated by visual observation and correlated to leaching potential, physical properties and microstructural features. The use of soluble silicate in the activator provides a denser and a less permeable matrix. This makes the extraction of free alkalis to the surface more difficult, reducing the extent of alkali leaching and therefore efflorescence. The use of K+ is also effective to reduce visible efflorescence. The efflorescence formation is predicted by the properties of the gel formed which are dependent on the mix proportioning.
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