University of Kashan Journal of Nanostructures 2251-7871 16 4 2026 10 01 Combined Impact of GGBS and Nanoparticle Surfaces on the Behavior of Calcined Kaolin Clay-based Self-Compacting Geo-Polymer Concrete 4685 4697 115630 10.22052/JNS.2026.04.018 EN Zaid Hasan Jaber Civil Engineering Department, Engineering College, University of Babylon, Iraq Haider M. Owaid Civil Engineering Department, Engineering College, University of Babylon, Iraq 0000-0002-8646-7941 Journal Article 2026 05 28 Self-Compacting Geopolymer Concrete (SCGPC) combines the advantages of Self-Compacting Concrete and Geopolymer Concrete, offering enhanced sustainability and performance. This study investigated the effects of partially replacing calcined kaolin clay (CKC) with Ground Granulated Blast Furnace Slag (GGBS) and incorporating nano-alumina (NA) or nano-clay (NC) on the fresh and mechanical properties of SCGPC. Six binary mixtures were prepared using a binder content of 493 kg/m³ and an alkaline liquid-to-binder ratio of 0.50, with CKC replaced by 40%, 50%, and 60% GGBS, while the control mix contained 100% CKC. Based on fresh and hardened properties, the optimum binary mixture was selected and modified by adding 2% NA or 2% NC to produce ternary mixes. Workability was evaluated using slump flow, V-funnel, and L-box tests. Results showed that GGBS significantly improved workability, whereas the addition of nanoparticles slightly reduced it; however, all mixtures satisfied EFNARC requirements. Mechanical properties, including compressive and splitting tensile strengths, were determined at 7 and 28 days. The 50% GGBS mixture exhibited the best performance among binary mixes. Nano-modified mixtures further enhanced strength, with 2% NA increasing compressive and tensile strengths by 39.9% and 31.6%, respectively, at 28 days compared with the control mix. https://jns.kashanu.ac.ir/article_115630_4d9c4c93d6808b8b74cf73c7d5dfa3a8.pdf