Research on durability control strategy of concrete structures based on life-prolonging and carbon reduction objectives
Extending the service life of concrete structures is an effective way to reduce the average annual carbon emission during the life-cycle of structures.An analysis method of durability control strategy considering the service life and carbon emission of concrete structures was proposed.Based on the reliability theory,three stages of deterioration process of concrete structure durability were considered,the influence of different durability control strategies on the reliability of concrete structures was studied,and the life calculation model and carbon emission calculation model of the durability control strategy of concrete structures were established.The quantitative index describing the effect of structural carbon reduction was put forward.By comparing the life-prolonging effect and carbon emission composition of different durability maintenance and repair methods,the service life and average annual carbon emission under different durability control strategies were calculated by considering the construction state and existing state of the structure respectively,and the life-prolonging and carbon reduction effects of different strategies were compared.The results show that the durability control strategy can extend the service life of the case structure by about 22 years and achieve 8.76％carbon reduction rate.In engineering practice,durability control strategies should be adopted for concrete structures as soon as possible in order to achieve better life-prolonging and carbon reduction effect.
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