| Title |
Impact of Binder Combinations on Concrete Compressive Strength and Durability of Concrete Utilizing Coal Gasification Slag Aggregate |
| Authors |
박상원(Park, Sang-Won) ; 한준희(Han, Jun-Hui) ; 한민철(Han, Min-Cheol) |
| DOI |
https://doi.org/10.5659/JAIK.2024.40.3.255 |
| Keywords |
Coal Gasification Slag; Mixed Fine Aggregate; Drying Shrinkage; Carbonation Depth; Frost Resistance |
| Abstract |
This study examines the potential use of coal gasification slag (CGS) as a fine aggregate in concrete mixtures, considering different
combinations of cement types and mix designs. Test results revealed that concrete flowability increases with changes in cement composition
and CGS replacement ratio, while reducing air content necessitates higher doses of air-entraining agent. The initial compressive strength of
concrete is notably high with cement, with greater long-term strength observed in combinations involving binary or ternary blended mineral
admixtures. However, a slight decrease of 1-5% in compressive strength is noted with an increased CGS replacement ratio. Durability
fluctuations, mostly minor, vary with cement type, generally showing positive results associated with the CGS replacement ratio. Nonetheless,
reduced frost resistance is observed only in the TBC+CGS 50% mixture, suggesting air content's predominant influence over CGS's impact on
frost resistance. Overall, CGS use as a fine aggregate of up to 50% poses no adverse effects on concrete's comprehensive physical properties
and durability. However, additional research is necessary to devise methods for maintaining optimal air content in CGS materials. |