JIANG Fei,WANG Liyan,LIU Tao,et al.Study on Dynamic Characteristics and Microstructure of Steel Slag Filler Considering Time Effects[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(04):940-951.
JIANG Fei,WANG Liyan,LIU Tao,et al.Study on Dynamic Characteristics and Microstructure of Steel Slag Filler Considering Time Effects[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(04):940-951. DOI: 10.13409/j.cnki.jdpme.20220930001.
Study on Dynamic Characteristics and Microstructure of Steel Slag Filler Considering Time Effects
Steel slag is the second largest waste product in metallurgical industry. Making full use of waste steel slag to partially replace sand and gravel as a new type of geotechnical filler aligns with the strategies of "green economy" and "sustainable development". Steel slag differs from sand and gravel due to its complex chemical composition and aging mechanical properties. Resonant column tests were used to study the dynamic characteristics of steel slag considering the influence of hydration period. It analyzed the variation patterns of dynamic shear modulus and damping ratio. The dynamic characteristics of steel slag considering time effects were described by using the Hardin-Drnevich hyperbolic model
and the Boltzman function was employed to describe the relationship between the maximum dynamic shear modulus and the hydration period
providing the range of maximum damping ratio. Comparing these dynamic characteristics with traditional sand
the dynamic shear modulus of steel slag before hydration was slightly higher than that of traditional fine sand
and the maximum dynamic shear modulus of standard sand could be reached after 90 days of hydration. This indicates that steel slag can be used as a filler to replace sand in engineering applications. Finally
the microstructure of steel slag at different hydration periods was analyzed by scanning electron microscope
revealing that the formation of hydration product Aft occurred in later stages compared to other hydration products. The gel structure composed of Aft and C-S-H was the main factor affecting the aging characteristics of steel slag dynamic properties.
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