In response to the strategic demand for the coordinated development of marine infrastructure and renewable energy, this study proposes a dynamic constitutive model for sea sand concrete that integrates negative carbon characteristics and energy storage functions. By electrolyzing seawater to solidify CO<inf>2</inf> and generating a carbonate mineral matrix (solidification rate ≥ 50%), combined with gradient calcination of shells to regulate multi-level pore structure (tortuosity τ=1.35, pore size 2-5nm accounting for>80%), a "mechanical electrochemical"dual functional material system is constructed. Molecular dynamics and phase field were simulated based on the big data of ConcreteGPT to reveal the mechanism of Cl2 migration barrier reduction in C-S-H gel (0.35eV → 0.23eV), and the dynamic constitutive equation driven by strain rate was established The model couples electrochemical impedance spectroscopy (EIS) with acoustic emission damage signals to achieve a quantitative correlation between crack propagation rate (da/dt) and capacitance decay (dC/dt). Experimental studies have shown that the material has an energy storage density of 4.7Wh/m ³ under 10Hz cyclic loading, a compressive strength retention rate of>90%, and a charge discharge efficiency of 78% in a -20 environment achieved through the PVT-ICF system. This study provides a theoretical and technical foundation for constructing a three in one ocean engineering system of "structure energy storage negative carbon". © 2025 Copyright held by the owner/author(s).
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