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Title |
Study on the Evaluation CO2 Emission-Absorption of Concrete in the View of Carbonation
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Keywords |
콘크리트 탄산화 ; CO2 concrete carbonation ; CO2 |
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Abstract |
A concrete is considered unfriendly-environmental material because it uses cement which emits much CO2 during producing process. However, a concrete absorbs CO2 through carbonation process during service life. In this paper how much concrete absorbs CO2 through carbonation was calculated using 1) concentration of carbonatable substances in concrete, 2) carbonated volume of concrete, 3) molecular weight of CO2 based on references and the method was proposed. CO2 emission from producing 1m3 concrete was calculated based on CO2 emission datum of materials used in concrete. From using these methods that calculate CO2 emission and absorption of concrete, assessment of CO2 emission-absorption against a real apartment was conducted by subtracting absorption CO2 according to service life from CO2 emission in the process of making concrete. As a result, a ratio of absorption over emission of CO2 through concrete carbonation according to service life 40, 60, 80 years was assessed about 3.65, 4.47, 5.18%. An objective of this study is to propose how to calculate emission - absorption of CO2 from producing and using concrete. Although the result value, emission - absorption of CO2, is 5.18% very low when the service life of an apartment is 80years, the value can be improved by reducing emission from using blended cement such as blast furnace slag or increasing replacement ratio of cement and increasing carbonated volume of concrete from expanding service life of a building. This study may be useful when CO2 emission - absorption of concrete is evaluated in the further study.
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