2026-10-14T21:39:41Z https://www.scidb.cn/oai

10.57760/sciencedb.34441 2025-12-29T18:38:44Z

2025-12-29 Mechanical, microstructural, and chloride ion penetration data of metakaolin specimens doi:10.57760/sciencedb.34441 en This investigation reveals a critical “performance window” for NaOH molarity (8–16 M) in metakaolin-based geopolymer concrete (MKGC) through an integrated analysis of mechanical properties, chloride transport, and multi-scale microstructure. Within this window, an optimal concentration of 14 M facilitates a synergistic regime in which geopolymerization produces a gel that is both dense (enhancing physical protection) and chemically active for chloride binding. This results in a significantly reduced chloride diffusion coefficient of 4.19 × 10⁻¹² m²/s. Deviations from this window lead to a decoupling of the synergistic effect: lower alkalinity yields a porous microstructure, whereas higher alkalinity inhibits effective chemical binding despite ongoing pore refinement. Metakaolin-based geopolymer concrete (MKGC); NaOH molarity; Chloride penetration resistance; Microstructural evolution; Service Life Prediction Renlong Wang PUBLIC https://creativecommons.org/licenses/by-nc-nd/4.0/ dataset Science Data Bank