Effect of Fly Ash on LifeCycle CO₂ Assessment of Concrete Structure

Abstract:

The objective of the present study is to ascertain the effect of fly ash (FA) on the lifecycle CO₂ assessment of reinforced concrete structures. The reliable lifecycle CO₂ assessment approach of concrete structures were established and then specified using the developed CO₂ a performance evaluation table. The system boundary studied was from cradle to recycling of concrete, which includes material system, concrete production, transportation, construction, use and recycling activity phases. The assumed time and regional boundaries for concrete mixes were 2012 and Seoul, South Korea, respectively. The carbonation depth of concrete and CO₂ uptake during use of structure and recycling phases were calculated based on the Yang et al.’s model. Using the performance evaluation table, the effect of FA on the lifecycle CO₂ assessment of concrete columns and beams in an office building was examined under the different concrete strengths. The parametric study clearly showed that high-strength concrete is favorable to the reduction of lifecycle CO₂ amount of concrete columns, whereas the reduction is not expected for concrete beams. The lifecycle CO₂ amount of concrete structures decreases with the increase in the substitution level of FA up to 20%, beyond which the decreasing rate is insignificant.

• Periodical: Applied Mechanics and Materials (Volume 692)
• Pages: 475-481
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.692.475
• Online since: November 2014
• Authors: Keun Hyeok Yang*, Eun A Seo, Dong Uk Choi
• Keywords: Concrete Compressive Strength, Fly Ash (FA), Lifecycle CO₂ Assessment

References

[1] K.H. Yang, Y.B. Jung, M.S. Cho, S.H. Tae, Effect of supplementary cementitious materials on reduction of CO2 emissions form concrete, J. Clean. Prod., (2014), Under published.

[2] ISO/DIS 13315-2, Environmental management for concrete and concrete structures-Part 2, System boundary and inventory data, International organization for standardization, Geneva, Switzerland, (2013).

[3] K.H. Yang, D.U. Choi, Effect of Concrete compressive strength and supplementary cementitious materials on lifecycle CO2 assessment of reinforced concrete structures, J. AIK., 30 (2014), 57-64.

DOI: 10.5659/jaik_sc.2014.30.3.057

[4] KEITI(Korea Environmental Industry & Technology Institute) : Korea LCI Database Information Network, http: /www. edp. or. kr , (2014).

[5] K.H. Yang, E.A. Seo, S.H. Tae, Carbonation and CO2 uptake of concrete, Environ. Impact Assess. Rev., 46 (2014), 43-52.