Conference Publication Details
Mandatory Fields
Goggins, J.
2010 Joint IABSE-fib Conference, Codes in Structural Engineering Developments and Needs for International Practice
Requirements for the Assessment of Embodied Energy into Structural Design Codes
Optional Fields
Accuracy and completeness of embodied energy, EE, analysis is dependant on the method used. This paper demonstrates that by understanding how energy is consumed in each constituent part and manufacturing processes of reinforced concrete, designers can significantly reduce the overall embodied energy structures. Embodied energy of products can vary from country to country. Therefore, to accurately estimate the embodied energy of RC structures, data specific to the country where they are being constructed must be used. This paper presents the assessment of embodied energy in typical reinforced concrete building structures in Ireland. The most common methods used to calculate EE are evaluated in this paper and the most suitable method was applied to reinforced concrete. The EE of a typical 30MPa concrete mix in Ireland is calculated to be 1.08 MJ/kg. Notably cement is credited with 68% of the total EE. The major contributors of energy consumption are identified and it is envisaged that this will aid in the development of techniques to minimise energy consumption and optimise efficiency. A case study is presented which compares the EE of a typical reinforced concrete structure in Ireland using two concrete mix designs. The first uses Ordinary Portland Cement, while the second uses ground granulated blast slag (GGBS) replacing half of the cement content. When compared, the outcomes are as predicted; the EE of the GGBS mix is significantly lower (30%) than that of its counterpart. Making the assessment of embodied energy mandatory will aid in the development of techniques to minimise energy consumption and optimise efficiency, thus significantly benefitting the environment.
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