The objective of this bibliometric review is to deliver an in-depth examination of the dynamic field of geopolymer concrete, revealing its evolution, current trends, and possible future trajectories. The method involves a rigorous bibliometric analysis of research output since the field's inception in 2003, underlining key milestones and mapping research patterns. Findings show a consistent surge in geopolymer concrete research, exemplified by over 1360 annual publications, with notable contributions predominantly from Australia and India. The paper also uncovers the increasing practical applications of geopolymer concrete, especially in construction processes, underpinned by a wealth of research on fly ash, a crucial manufacturing component. Additionally, prevalent research themes include compressive strength, fly ash, and geopolymer itself. The review's novelty lies in its comprehensive overview of geopolymer concrete research, elucidating past and present trends and identifying potential future research areas. It thereby serves as a firm foundation for further studies, fostering continued growth in this promising field. Doi: 10.28991/CEJ-2023-09-09-017 Full Text: PDF

This study investigates the impact of Zinc Oxide nanoparticles (ZnO NPs) on the mechanical properties and microstructural development of cement-based composites. Characterization using Scanning Electron Microscopy (SEM) and Dynamic Light Scattering (DLS) revealed uniformly distributed, spherical ZnO NPs with an average size of approximately 72 nm. X-ray Diffraction (XRD) and SEM analyses were performed on cement paste and mortar specimens with varying ZnO NP contents (1.0%, 1.5%, 2.0%, 2.5%, and 3.0% by weight). The results indicate that lower ZnO NP contents (1.0% and 1.5%) accelerate initial setting times, while higher contents (2.0%, 2.5%, and 3.0%) delay them due to the formation of clinohedrite (CaZn(SiO)₄•H₂O), which increases porosity and reduces matrix compaction. Calorimetric analysis showed decreased hydration heat with rising ZnO NP content, negatively affecting workability. This study highlights the dual effect of ZnO NPs in cement-based materials: low concentrations improve early-age mechanical performance, while higher amounts hinder hydration and microstructural integrity. These findings provide insights into optimizing ZnO NP dosage for the development of high-performance, nano-enhanced construction materials.