Preparation of geopolymer composites based on alkali excitation

摘要

In order to explore the preparation of geopolymer composites based on alkali excitation, the ultrafine metakaolin and industrial water glass were selected as alkali activator raw materials in this study, and then sodium hydroxide was added later to prepare geopolymer. After completion, different dosages of accelerators were added to select the most excellent geopolymer composites. The results showed that through the characterization analysis, it was found that the accelerator participates in the polymerization reaction and enters into the structure of the geopolymer, so that the gel phase of the geopolymer changes to the granular phase. And the apparent density and porosity of the geopolymer are optimal when the amount of accelerator is 5 wt. It was found that the triphosadenine (ATP)-enhanced geopolymer is most obvious by infrared spectroscopy. And by analyzing its thermogravimetric and mechanical properties, it was found that the addition of accelerator significantly improves the compressive strength of the geopolymer. Although it will increase at first, until the addition amount is 1wt, there will be a downward trend. However, within the concentration range of the added accelerator, it was found that the compressive strength of the prepared geopolymer was higher than that of the geopolymer without the accelerator. It can be known that the accelerator can achieve the enhancement of the geopolymer, and the content of the accelerator can be optimized to maximize the reinforcing effect, and provide an experimental reference for the application of the geopolymer composite.