| With further research on carbon sinks,a large part of the carbon sequestration in the global carbon cycle has yet to be discovered.Some studies have pointed out that part of "carbon misunderstood" can point to the process of concrete carbonization.In the process of carbonation of concrete will also absorb the air of C02,concrete carbon sink is a part of the carbon loss in the make-up.However,under the premise of the increasing construction in our country,the amount of concrete construction is also gradually increasing.The ability of concrete buildings to have carbon sinks should also be valued and recognized.Therefore,this paper through the basic theory of concrete carbonation,with concrete building as the main research object in-depth discussion.In this paper,based on the basic theory of concrete carbonization of the actual concrete structures were sampled.Experiment on concrete from microscopic point of view.Through the phenolphthalein test to determine the depth of carbonation of concrete specimens of various structures.Thermogravimetric analysis and scanning electron microscopy(SEM)were used to measure and calculate the carbon sinks in the carbonized and uncarbonized samples.Finally,the carbon sink capacity of the concrete components of each building is calculated and the carbon sinks of the structural parts of the building are calculated.Second,from the perspective of medium-term through the concrete carbonation literature data analysis to determine the impact of carbon sequestration factors.The influential factors are discussed from the concrete material influencing factors,the building itself and the environmental factors.Concrete water-cement ratio,cement varieties,cement content,concrete admixtures and aggregate varieties were analyzed.In-depth analysis was conducted from the building’s concrete exposed area,carbon dioxide concentration,ambient temperature and ambient humidity.Then,the model of carbon sink in concrete construction was established and determined from a macro perspective.The establishment of the final model was established from the relations of two variables in time and space.In terms of time variables,the determination of carbon dioxide diffusion coefficient by temperature,humidity and compressive strength of concrete was discussed.The relationship between the amount of cement used,the amount of carbon per unit volume of concrete and the carbon dioxide absorbed per unit time were analyzed.In the spatial variables,the concrete exposure area is determined from the structure of the building,the envelope structure and other aspects,and the carbon dioxide concentration is determined from the use function of the building,the regional environment and the regional differences.Finally,the reliability of the model is verified by comparing with the measured carbon sinks.The model itself was evaluated and evaluated from different carbon emission strategies,and other models were compared.Finally,the application direction of the model in the architectural design phase and the building energy conservation is discussed.Finally,the basic guiding direction in the application of urban planning is put forward. |
