Mechanical and microstructural characterization of molybdenum tailings-, GGBS- and recycled aggregate based-low carbon self-compacting concrete

This study investigates self-compacting concrete (SCC) prepared by substituting ground granulated blast furnace slag (GGBS) with Molybdenum Tailings (MTL) and examines effects on mechanical properties and microstructure. Testing included slump, compressive strength (CS), split tensile strength (STS), pore structure, scanning electron microscopy (SEM), and X-ray diffraction (XRD). Results showed that SCC with 25% MTL had a denser microstructure and improved strength, while higher MTL substitution increased porosity, reducing CS and STS. SEM analysis revealed well-hydrated GGBS, dense calcium-silicate-hydrate gels (C-S-H) gels, and larger pores with over 50% MTL.