International Journal of Scientific Research and Engineering Development

In order to create lightweight masonry units with sufficient strength and stability, the study focuses on the development of geopolymer foam concrete (GFC) blocks. The study examines how changes in density and alkaline activator molarity affect the fresh and hardened characteristics of geopolymer foam concrete. A fly ash-based geopolymer matrix was activated using three different activator concentrations: 8 M, 10 M, and 12 M sodium hydroxide mixed with sodium silicate. To create a homogeneous cellular structure and lower overall density, an alpha-olefin sulfonate (AOS) solution was employed as the foaming agent. To find the ideal composition that offers a balance between workability, density, and strength, foamed geopolymer mixes were made at various target densities, such as 1200, 1300, and 1400 kg/m³. Workability and mix homogeneity were evaluated by measuring the qualities of fresh concrete, such as foam stability and flow. After ambient curing, the hardened specimens were examined for split tensile strength and compressive strength to determine performance patterns over molarities and densities. Determine the ideal mix ratio as well. The outcomes should demonstrate the ideal activator concentration and foam content needed to produce a lightweight geopolymer block with adequate strength (≈4–5 MPa) and improved durability, appropriate for infill and non-load-bearing wall applications.

R.Mohamed Nadheem, M.Murugan,"Optimization of Mix Proportion and Strength Properties of Lightweight Geopolymer Concrete Blocks" International Journal of Scientific Research and Engineering Development, V9(3): Page(1040-1050) May-June 2026. ISSN: 2581-7175. www.ijsred.com. Published by Scientific and Academic Research Publishing.