Variability in the life cycle of concrete block CO2 emissions and cumulative energy demand in the Brazilian Market

• Demonstrates the variability within manufacturers of the same construction products.
• Shows that LCA results of a specific technological route should be used with caution.
• Unveils a cleaner production potential within the concrete blocks manufacturing sector.
• Analysis based on original life cycle data of the Brazilian material construction sector.

In this study we estimate CO2 life cycle emissions and cumulative energy demand (CED) of several concrete block manufacturers in Brazil. The assessment is based on original data collected from 29 concrete block producers in distinct Brazilian regions. Blocks with different strengths were assessed. We have combined original data with information from the literature, and most of the assessment was based on information representing the domestic context. Considering the same technological route and the various block types, CO2 emissions vary 2.6–3.3 times, whereas CED varies 3.5–4.0 times. Cement consumption was responsible for most of the differences, and the effect of low clinker content cement was not decisive. Although Brazil has a vast territory, the impact of transportation was small. Results demonstrate that there is a potential for cleaner production strategies within the sector. Simplified life cycle assessment tools, such as the one applied in this study, are relevant to pursue effective solutions for reducing energy consumption and achieving low carbon solutions within the construction components industry.