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http://dx.doi.org/10.4334/JKCI.2014.26.2.201

A Model for Lifecycle CO2 Assessment of Building Structures Considering the Mixture Proportions of Concrete  

Yang, Keun-Hyeok (Dept. of Plant.Architectural Engineering, Kyonggi University)
Seo, Eun-A (Dept. of Architectural Engineering, Kyonggi University Graduate School)
Publication Information
Journal of the Korea Concrete Institute / v.26, no.2, 2014 , pp. 201-210 More about this Journal
Abstract
The present study proposes a phased model to assess the lifecycle $CO_2$ amount of concrete structures. The considered system boundary is from cradle to recycling, which includes constituent material, transportation, batching and mixing in ready-mixed concrete plant, use and demolition of structure, and crushing and recycling of demolished concrete. The $CO_2$ uptake of concrete by carbonation during lifetime (40 years) of a structure and the recycling life (20 years) after demolition is estimated using a simple approach generalized to predict the carbonation depth from the surfaces of concrete element and recycled aggregates. Based on the proposed phased model, a performance evaluation table is realized to straightforwardly examine the lifecycle $CO_2$ amount of concrete structures. The proposed model demonstrates that the contribution of ordinary portland cement (OPC) to lifecycle $CO_2$ emission of the concrete structure occupies approximately 85%. Furthermore, the $CO_2$ uptake is estimated to be approximately 15~18% of the lifecycle $CO_2$ emissions of concrete structures, which corresponds to be 19~22% of the emissions from OPC production. Overall, the proposed $CO_2$ performance table is expected to be practically useful as a guideline to determine the $CO_2$ emission or uptake at each phase of concrete structures.
Keywords
lifecycle $CO_2$; emission; uptake; concrete structure; performance table;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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