Editorial

The six papers featured in this issue reflect current priorities in construction materials research: advancing structural performance while improving sustainability and durability. The contributions, originating from Türkiye, India, Pakistan, and Australia, span both fundamental materials design and applied engineering investigations.The first study, by Kaya (2026), examines the interaction between chemical activators and curing regimes in metakaolin–fly ash geopolymers. Using rigorous statistical analysis, the work shows that the relationship between alkali concentration and curing conditions is non-linear. Optimal structural performance depends on carefully balanced combinations of molarity and thermal energy rather than on increasing either parameter independently. The findings offer practical guidance for proportioning low-carbon binders capable of meeting demanding structural requirements.Addressing urban challenges such as stormwater management and heat island effects, the second article by Pattanayak et al. (2026) presents a bibliometric review of pervious concrete research. This material, defined by its interconnected pore network, enables water infiltration, groundwater recharge, and reduced surface runoff. Reviewing nearly three decades of publications, the authors document the evolution from basic mixture development to performance-driven applications. The study also underscores a persistent challenge, pore clogging, and identifies maintenance strategies as a critical area for future work.The third contribution, by Khan et al. (2026), investigates hybrid fibre reinforcement using sugarcane fibres, an abundant agricultural byproduct in warm climates, combined with polypropylene fibres. While each fibre type enhances specific properties, their combined use produces a synergistic improvement in post-cracking behaviour. The study demonstrates how agricultural residues can be incorporated into structural materials, contributing to resource efficiency within the built environment.In the fourth paper, Sial et al. (2026) develop a bio-modified geopolymer by incorporating natural polymers derived from Terminalia chebula and honey into a fly ash–based system. The resulting material achieves effective curing at ambient temperatures, including under colder conditions. Partial replacement of fly ash with cement, together with the bio-additives, leads to increased compressive strength and reduced water absorption. The results indicate that bio-based modifiers can refine pore structure and enhance performance, supporting practical, energy-efficient binder systems for on-site construction.The fifth study, by Hossain et al. (2026), focuses on alkali-activated reactive powder concrete as a lower-carbon alternative to conventional reactive powder systems, which typically require high cement contents. Using ground granulated blast furnace slag as the primary binder, the researchers achieved ultra-high mechanical performance without external heat or pressure. Performance gains were obtained through controlled adjustment of activator chemistry and silicate modulus, illustrating how industrial byproducts can be engineered to deliver both structural efficiency and environmental benefits.Finally, Lanjewar et al. (2026) propose a circular economy approach by utilising coal mine overburden as a full replacement for natural fine aggregates in one-part alkali-activated self-compacting concrete. The developed mixture satisfies strength requirements while exhibiting low thermal conductivity and limited shrinkage. This approach addresses two issues simultaneously: reducing dependence on natural river sand and providing a productive application for mining residues.Together, these studies point to a coherent direction in cementitious materials research, integrating innovative binders, fibre reinforcement, and waste valorisation strategies to meet structural, durability, and environmental goals. As the construction sector faces increasing pressure to reduce carbon dioxide emissions while maintaining resilience, research that balances performance with sustainability becomes essential. Continued work towards standardised testing, lifecycle assessment, and validation under field conditions will further strengthen the transition from laboratory development to practical implementation.