High-performance eco-concrete beams with calcined montmorillonite, metakaolin pyrolyzed coffee grounds, and hybrid fibers for enhanced bending strength and microstructural refinement - Amani Abdallah Hepautwa; Askwar Hilonga; Register Mrosso; Tusekile Alfredy; Gabriel Mwalusambo; Fina Lesafi; Yusufu Abeid Chande Jande (PLoS ONE, 2026)