Acknowledgement
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2015R1A5A1037548)
Proceedings of the Korean Institute of Building Construction Conference (한국건축시공학회:학술대회논문집)
- 2020.11a
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- Pages.77-78
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- 2020
Waste Glass as an Activator in Class-C fly Ash/GGBS based Alkali Activated Material
- Sasui, Sasui (Department of Architectural Engineering, Chungnam National University) ;
- Kim, Gyu Yong (Department of Architectural Engineering, Chungnam National University) ;
- Lee, Sang Kyu (Department of Architectural Engineering, Chungnam National University) ;
- Son, minjae (Department of Architectural Engineering, Chungnam National University) ;
- Hwang, Eui Chul (Department of Architectural Engineering, Chungnam National University) ;
- Nam, Jeong Soo (Department of Architectural Engineering, Chungnam National University)
- Published : 2020.11.12
Abstract
An alkaline activator was synthesized by dissolving waste glass powder (WGP) in NaOH-4M solution to explore its effects on the Class-C fly ash (FA) and ground granulated blast furnace slag (GGBS) based alkali-activated material (AAM). The compressive strength and porosity were measured, and (SEM-EDX) were used to study the hydration mechanism and microstructure. Results indicated that the composition of alkali solutions was significant in enhancing the properties of the obtained AAM. As the amount of dissolved WGP increased in alkaline solution, the silicon concentration increased, causing the accelerated reactivity of FA/GGBS to develop Ca-based hydrate gel as the main reaction product in the system, thereby increasing the strength. Further increase in WGP dissolution led to strength loss, which were believed to be due to the excessive water demand of FA/GGBS composites to achieve optimum mixing consistency. Increasing the GGBS proportion in a composite also appeared to improve the strength which contributed to develop C-S-H-type hydration.