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Title |
Development of an ECC (Engineered Cementitious Composite) Designed with Ground Granulated Blast Furnace Slag
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Keywords |
ECC ; 고로슬래그미분말 ; 마이크로역학 ; 쐐기쪼갬시험 ; 변형률 경화거동 |
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Abstract |
This paper presents both experimental and analytical studies for the development of an ECC (Engineered Cementitious Composites) using ground granulated blast fumace slag(slag). This material has been focused on achieving moderately high composite strength while maintaining high ductility, represented by strain-hardening behavior in nniaxial tension. In the material development, micromechanics was adopted to properly select optimized range of the composition based on steady-state cracking theory and experimental studies on matrix, and interfacial properties. A single fiber pullout test and a wedge splitting test were employed to measure the bond properties of the fiber in a matrix and the fracture toughness of mortar matrix. The addition of the slag resulted in slight increases in the frictional bond strength and the fracture toughness. Subsequent direct tensile tests demonstrate that the fiber reinforced mortar exhibited high ductile nniaxial tension behavior with a maximum strain capacity of 3.6 %. Both ductility and tensile strength( ~ 5.3 MPa) of the composite produced with slag were measured to be significantly higher than those of the composite without slag. Th_e slag particles contribute to improving matrix strength and fiber dispersion, which is incorporated with enhanced workability attributed to the oxidized grain surface. This result suggests that, within the limited slag dosage employed in the present study, the contribution of slag particles to the workability overwhelms the side-effect of decreased potential of saturated multiple cracking.
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