Abstract
Abstract While the cement plant is considered one of the most polluting industry, responsible for about 5% of global CO2 emissions, the concrete has the potential to uptake this gas through the carbonation process, offset in part the emissions generated in its production. With the purpose to analyze this process, this study aims to evaluate emissions and CO2 uptake with cement content 300-580 kg produced with different cement types (CP II F, CP II E, CP II Z, CP III, CP IV and CP V). Through mathematical modeling, the emissions balance was made, identifying the mix that shows good resistance to carbonation and greater absorption of CO2 during the concrete life cycle. The results show that concrete with cement consumption between 380 and 420 kg/m³ showed better balance emissions.
Highlights
The elevated gaseous emissions of the cement production have drawn the attention of the productive sector, since cementitious industry is, by itself, responsible for approximately 5 to 7% of CO2 global emissions [1, 2, 3]
While the cement plant is considered one of the most polluting industry, responsible for about 5% of global CO2 emissions, the concrete has the potential to uptake this gas through the carbonation process, offset in part the emissions generated in its production
With the purpose to analyze this process, this study aims to evaluate emissions and CO2 uptake with cement content 300-580 kg produced with different cement types (CP II F, CP II E, CP II Z, CP III, CP IV and CP V)
Summary
The elevated gaseous emissions of the cement production have drawn the attention of the productive sector, since cementitious industry is, by itself, responsible for approximately 5 to 7% of CO2 global emissions [1, 2, 3]. Due to actions of the cementitious industry, the CO2 emissions, caused by the cement production, represent a participation of 3%, according to data from the 2o Inventário Brasileiro de Emissões e Remoções Antrópicas de Gases de Efeito Estufa (Brazilian Inventory of Anthropic Emissions and Removal of Greenhouse Effect Gases), with data pertaining to the years from 1990 to 2005, with the country emitting around 536 kg of CO2 per ton of cement produced [4]. In non-reinforced concrete elements (i.e., dams, concrete walls, pavers, decorative elements, among others), though, carbonation can be beneficial, acting as a process of atmospheric CO2 uptake, partially compensating the CO2 generated in the cement production [7, 12, 13, 14], and can be considered in the balance of greenhouse effect gases emissions. In order to, using simulation and mathematical modelling, a period of 100 years will be analyzed, of which 70 years refers to the concrete service life and 30 years refer to the post demolition period
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