Effect of chemical admixtures on properties of high-calcium fly ash geopolymer |
| |
| Authors: | Ubolluk Rattanasak Kanokwan Pankhet Prinya Chindaprasirt |
| |
| Affiliation: | (1) Hazardous Waste Management Laboratory, School of Energy And Environmental Studies, Devi Ahilya University, Takshila Campus, Khandwa Road, Indore, 452001, MP, India; |
| |
| Abstract: | Owing to the high viscosity of sodium silicate solution, fly ash geopolymer has the problems of low workability and rapid
setting time. Therefore, the effect of chemical admixtures on the properties of fly ash geopolymer was studied to overcome
the rapid set of the geopolymer in this paper. High-calcium fly ash and alkaline solution were used as starting materials
to synthesize the geopolymer. Calcium chloride, calcium sulfate, sodium sulfate, and sucrose at dosages of 1wt% and 2wt% of
fly ash were selected as admixtures based on concrete knowledge to improve the properties of the geopolymer. The setting time,
compressive strength, and degree of reaction were recorded, and the microstructure was examined. The results show that calcium
chloride significantly shortens both the initial and final setting times of the geopolymer paste. In addition, sucrose also
delays the final setting time significantly. The degrees of reaction of fly ash in the geopolymer paste with the admixtures
are all higher than those of the control paste. This contributes to the obvious increases in compressive strength. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
| 点击此处可从《矿物冶金与材料学报》浏览原始摘要信息 |
|
点击此处可从《矿物冶金与材料学报》下载全文 |
|
