Authors
Carlos Rodriguez, Pablo Gómez, Felipe Martí, Sumit Srivastava, Marina Sanchez, Fernando Fernandez, Irene Beleña, Miriam Hernández.
Abstract
The paper develops low-carbon autoclaved aerated concrete (AAC) by fully replacing OPC with lime-activated GGBFS and, in some mixes, adding calcium carbide slag (CCS). Five AAC formulations were tested (workability, foaming, strength, density, thermal conductivity, phase composition, and LCA). CCS boosted tobermorite formation during autoclaving, enabling BFS+CCS mixes to reach compressive strengths comparable to the OPC reference while keeping very low densities (≈420–441 kg/m³) and thermal conductivities of 0.111–0.119 W/(m·K). LCA (EF 3.1, cradle-to-gate) showed up to ~48% CO₂-equivalent reduction versus OPC-AAC, with BFS+CCS mixes meeting UNE-EN 771-4 strength requirements for load-bearing AAC blocks.
Type of publication
Journal paper.
Publisher
Applied Sciences (MDPI), Special Issue “Enhancing Concrete Sustainability: Innovative Materials and Technologies for Greener Concrete”; Published 11 September 2025.
DOI
10.3390/app15189946.
