Author(s): Amir Hossein Farzaneh, Leila Khademi and Reza Mohammadi

Abstract: The growing demand for sustainable construction materials has intensified research on green concrete as an alternative to conventional cement-based systems. This study evaluates the mechanical and durability performance of green concrete incorporating industrial by-products specifically fly ash and ground granulated blast furnace slag (GGBS) as partial cement replacements, along with recycled aggregates as a sustainable substitute for natural aggregates. Several concrete mixes were designed with varying replacement levels, including FA30, GGBS30, RA30, and a ternary blend FA20+GGBS20, and compared against a control mix. Fresh properties (slump), mechanical properties (compressive, tensile, and flexural strength), and durability parameters (water absorption, sorptivity, and rapid chloride permeability) were assessed at different curing ages. Statistical analysis using one-way ANOVA revealed significant differences between mixes (p < 0.05), with SCM-rich blends demonstrating superior performance. The FA20+GGBS20 mix achieved the highest late-age strength and lowest chloride permeability, confirming the synergistic benefits of combined SCM use. Although RA30 showed reduced workability and slightly lower durability, performance remained within acceptable structural limits. These findings underscore the environmental and structural advantages of SCM incorporation in concrete and underscore the potential of recycled aggregates in sustainable construction. Practical recommendations include optimizing SCM content, enhancing recycled aggregate processing, and integrating durability-focused design standards. The research reinforces green concrete as a technically viable and environmentally responsible solution for modern infrastructure development worldwide.

Pages: 40-44 | Views: 16 | Downloads: 10

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