Solidified Dredged Soil for Offshore Wind Turbine Scour Protection: Mechanical Properties, Microscopic Mechanisms, and Carbon Emission Assessment

To address the challenges of dredged soil disposal and scour protection for offshore wind turbine foundations, this study proposes a method for preparing fluidized solidified soil (FSS) from dredged soil for scour protection. The prepared FSS showed suitable flowability, dispersion resistance, and unconfined compressive strength (UCS) for pumped underwater scour protection: its flowability ranged from 17.0 to 30.5 cm, turbidity ranged from 17.0 to 88.4 NTU, and UCS at 28 d reached 886.30 kPa. The rheological behavior of FSS is well described by the Herschel-Bulkley model, exhibiting distinct yield stress and shear-thinning characteristics. The hydroxyl groups of hydroxypropyl methylcellulose and hydroxypropyl starch ether bond with water molecules and solid particles to enhance dispersion resistance, while their interaction with calcium silicate hydrate gel and ettringite improves the toughness of FSS. Carbon emission and economic analyses indicate that, compared with other scour protection methods, the FSS approach reduces carbon dioxide emissions by 74