Marine infrastructure is increasingly vulnerable to harsh environmental conditions that accelerate the degradation of traditional materials such as Portland cement concrete and carbon steel.This review systematically ...Marine infrastructure is increasingly vulnerable to harsh environmental conditions that accelerate the degradation of traditional materials such as Portland cement concrete and carbon steel.This review systematically investigates recent advancements in sustainable alternatives,including geopolymer concrete,engineered innovacementitious composites(ECC),bio-concrete,fiber-reinforced polymers(FRPs),and bamboo,stainless steel,and steel-CFRP hybrid bars.Each material is evaluated based on marine durability,mechanical performance,environmental impact,and cost feasibility using life cycle assessment,durability modelling,and a multi-criteria decisionsupport framework.The results reveal that geopolymer concrete and FRP reinforcement’s exhibit superior corrosion resistance and environmental benefits,while ECC and steel-CFRP composites offer structural resilience with moderate environmental trade-offs.However,challenges remain in long-term performance validation,standardization,and market integration.The review concludes that a combined approach involving innovative materials,computational tools,and sustainability assessment is essential for advancing marine infrastructure.Outlook recommendations include focused field studies,development of regulatory guidelines,and interdisciplinary collaboration to drive the practical adoption of eco-efficient materials in coastal and offshore construction.展开更多
Carbon dioxide energy storage(CES)is an emerging compressed gas energy storage technology which offers high energy storage efficiency,flexibility in location,and low overall costs.This study focuses on a CES system th...Carbon dioxide energy storage(CES)is an emerging compressed gas energy storage technology which offers high energy storage efficiency,flexibility in location,and low overall costs.This study focuses on a CES system that incorporates a high-temperature graded heat storage structure,utilizing multiple heat exchange working fluids.Unlike traditional CES systems that utilize a single thermal storage at low to medium temperatures,this system significantly optimizes the heat transfer performance of the system,thereby improving its cycle efficiency.Under typical design conditions,the round-trip efficiency of the system is found to be 76.4%,with an output power of 334 kW/(kg·s^(-1))per unit mass flow rate,through mathematical modeling.Performance analysis shows that increasing the total pressure ratio,reducing the heat transfer temperature difference,improving the heat exchanger efficiency,and lowering the ambient temperature can enhance cycle efficiency.Additionally,this paper proposes a universal and theoretical CES thermodynamic intrinsic cycle construction method and performance prediction evaluation method for CES systems,providing a more standardized and accurate approach for optimizing CES system design.展开更多
文摘Marine infrastructure is increasingly vulnerable to harsh environmental conditions that accelerate the degradation of traditional materials such as Portland cement concrete and carbon steel.This review systematically investigates recent advancements in sustainable alternatives,including geopolymer concrete,engineered innovacementitious composites(ECC),bio-concrete,fiber-reinforced polymers(FRPs),and bamboo,stainless steel,and steel-CFRP hybrid bars.Each material is evaluated based on marine durability,mechanical performance,environmental impact,and cost feasibility using life cycle assessment,durability modelling,and a multi-criteria decisionsupport framework.The results reveal that geopolymer concrete and FRP reinforcement’s exhibit superior corrosion resistance and environmental benefits,while ECC and steel-CFRP composites offer structural resilience with moderate environmental trade-offs.However,challenges remain in long-term performance validation,standardization,and market integration.The review concludes that a combined approach involving innovative materials,computational tools,and sustainability assessment is essential for advancing marine infrastructure.Outlook recommendations include focused field studies,development of regulatory guidelines,and interdisciplinary collaboration to drive the practical adoption of eco-efficient materials in coastal and offshore construction.
基金supported by the National Natural Technology Development,China(Grant Nos.ZYYD2022B11 and 2022ZY0048).
文摘Carbon dioxide energy storage(CES)is an emerging compressed gas energy storage technology which offers high energy storage efficiency,flexibility in location,and low overall costs.This study focuses on a CES system that incorporates a high-temperature graded heat storage structure,utilizing multiple heat exchange working fluids.Unlike traditional CES systems that utilize a single thermal storage at low to medium temperatures,this system significantly optimizes the heat transfer performance of the system,thereby improving its cycle efficiency.Under typical design conditions,the round-trip efficiency of the system is found to be 76.4%,with an output power of 334 kW/(kg·s^(-1))per unit mass flow rate,through mathematical modeling.Performance analysis shows that increasing the total pressure ratio,reducing the heat transfer temperature difference,improving the heat exchanger efficiency,and lowering the ambient temperature can enhance cycle efficiency.Additionally,this paper proposes a universal and theoretical CES thermodynamic intrinsic cycle construction method and performance prediction evaluation method for CES systems,providing a more standardized and accurate approach for optimizing CES system design.
