|
Title |
Evaluation of Mechanical Properties and Durability of Concrete Incorporating Coal Gangue as Fine Aggregate
|
|
Authors |
김일순(Il Sun Kim) ; 최소영(So Yeong Choi) ; 양은익(Eun Ik Yang) |
|
DOI |
https://doi.org/10.11112/jksmi.2026.30.3.39 |
|
Keywords |
석탄 폐석; 콘크리트; 내구성; 전기 비저항; 잔골재 대체 Coal gangue; Concrete; Durability; Electrical resistivity; Fine aggregate replacement |
|
Abstract |
This study evaluates the effects of replacing natural fine aggregate with coal gangue on the workability, mechanical properties, and durability of concrete, with supplementary mortar tests. As the replacement ratio increased, slump and air content decreased, whereas mortar flow increased, indicating different flow behaviors depending on the presence of coarse aggregate. Compressive strength increased with replacement ratio, reaching up to an 11.2% improvement at 91 days. This enhancement is attributed to the combined effects of fine particle filling, pore refinement, and a slight reduction in the effective water?cement ratio. In contrast, the elastic modulus showed no significant change. The chloride diffusion coefficient and electrical resistivity improved with curing age, while the influence of the replacement ratio was limited. Overall, concrete incorporating coal gangue exhibited improved compressive strength while maintaining comparable durability. However, reduced workability requires mix design optimization, including the use of chemical admixtures, for practical application.
|