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 characteris-tics of steel slag considering time effects were described by using the Hardin-Drnevich hyperbolic mod-el,and the Boltzman function was employed to describe the relationship between the maximum dy-namic shear modulus and the hydration period,providing the range of maximum damping ratio. Com-paring these dynamic characteristics with traditional sand,the dynamic shear modulus of steel slag be-fore 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 forma-tion 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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