Embodied Carbon, Time and Cost of Two Post-Office Buildings (2026-02)¶

This study evaluates the potential of 3D Printed Concrete technology as an innovative alternative to conventional reinforced cement concrete construction. The comparison focuses on three primary aspects: environmental impacts through material consumption and embodied carbon, project duration and construction cost. A case study was conducted involving two post office buildings in Bengaluru, India: Case 1, a building constructed using conventional RCC and Case 2, a building based on 3D concrete printing (3DCP), both with comparable floor area and functional requirements but with different architectural layouts. A cradle-to-gate Life Cycle Assessment was carried out to assess the material-related embodied carbon emissions, supported by quantity take-offs, carbon emission factors from standard databases, and on-site energy use data. This study identifies the advantages of 3DCP, including increased construction speed, reduced material and formwork use, and a lower environmental footprint. Results show that 3DCP achieved a 19% reduction in embodied carbon, 17% lower total material consumption, 48% lower steel rebar consumption and a 56% reduction in construction time compared to the conventional RCC construction. While the superstructure cost of the 3DCP buildings could be 35-78% higher due to limited market adoption and underutilization of printing equipment at the site, the findings suggest strong potential for cost optimization as scale and technological maturity increase. Overall, the results indicate that 3DCP could play a key role in shaping the future of sustainable construction, offering practical solutions to meet the challenges of urban development and infrastructure delivery.