Fabrication of lightweight geopolymer based on the IGCC slag (IGCC 용융 슬래그를 이용한 경량 지오폴리머 제조)

Soo-bin Park (박수빈); Kangduk Kim (김강덕); KANG SEUNG GU (강승구)

doi:10.6111/JKCGCT.2017.27.6.319

Fabrication of lightweight geopolymer based on the IGCC slag

Journal of the Korean Crystal Growth and Crystal Technology
Abbr : J. Korean Cryst. Growth Cryst. Technol.
2017, 27(6), pp.319-326
DOI : 10.6111/JKCGCT.2017.27.6.319
Publisher : The Korea Association Of Crystal Growth, Inc.
Research Area : Engineering > Materials Science and Engineering
Published : December 31, 2017

Soo-bin Park ¹, Kangduk Kim ¹, KANG SEUNG GU ¹

¹경기대학교

Accredited

ABSTRACT

In this study, a lightweight geopolymer was prepared using by slag discharged from IGCC (Integrated Gasification Combined Cycle) power plant and its physical properties, the density and compressive strength, were analyzed as a function of the concentration of alkali activators, W/S ratio and aging times. Also the possibility of applying it to lightweight materials by adding Si sludge as a foaming agent to the geopolymerg was investigated. In particular, a complex composition of alkali activator and a pre-curing process were applied to improve the strength properties of lightweight geopolymers. While the compressive strength of the lightweight geopolymer using a single activator was 9.5 MPa, the specimen made with a complex composition of alkali activator had compressive strength of 2~5 times higher. In addition, the lightweight geopolymer with pre-curing process showed a compressive strength value of 18~48 % higher than that of specimen made with no precuring process. In this study, by using a complex activator and a pre-curing process. the maximum compressive strength of lightweight geopolymer was obtained as 40 MPa (The specimen was aged for 3 days and had density of 1.83 g/cm 3 ), which is comparable to cement concrete. By analyzing the crystal phase and microstructure of geopolymers obtained in this study using by XRD and SEM, respectively, it was confirmed that the flower-bud-like zeolite crystal was homogeneously distributed on the surface of the C-S-H gel (sodium silicate hydrate gel) in the geopolymer.

KEYWORDS

IGCC slag, Si sludge, Compressive strength, Density, Lightweight geopolyemer

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* References for papers published after 2023 are currently being built.

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Journal of the Korean Crystal Growth and Crystal Technology 2023 KCI Impact Factor : 0.19

Fabrication of lightweight geopolymer based on the IGCC slag

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* References for papers published after 2023 are currently being built.

Journal of the Korean Crystal Growth and Crystal Technology 2023 KCI Impact Factor : 0.19

Fabrication of lightweight geopolymer based on the IGCC slag

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