Influence of Ion Chelating Agents with Different Chelating Abilities on the Properties and Microstructure of Cement-Based Materials

作者：Ke Zhao, Ruiyang Wang, Jianying Yu, Quantao Liu, Yagang Zha · 发表于：Materials · 年份：2025 · DOI：10.3390/ma18102256 · 被引用次数：5 · 研究领域：Concrete and Cement Materials Research、Magnesium Oxide Properties and Applications、Innovative concrete reinforcement materials

Concrete structures are prone to cracking and seepage issues due to material degradation during long-term service. Ionic chelating agents (ICAs) can significantly enhance the durability and extend the service life of concrete structures by chelating metal ions in the cement matrix and promoting the formation of crystalline products within pores. The study selected commonly used ICAs, including sodium gluconate, sodium maleate, and sodium citrate, as well as a self-made high-efficiency ICA, to compare their chelating abilities for metal ions (such as Al3+, Mg2+, Fe3+, and Ca2+). Their effects on the performance and microstructure of cement-based materials were evaluated through tests on hydration heat, mechanical strength, the chloride ion diffusion coefficient, pore size distribution, and microstructural analysis. The results showed that the stronger the chelating ability of the ICA, the more significant its improvement on the performance and microstructure of cement-based materials. Cement paste incorporating the high-efficiency ICA exhibited significantly accelerated hydration kinetics, with the hydration rate markedly increasing and the peak heat release rising from 0.0012 W/g to 0.0016 W/g, thereby effectively enhancing the early-age properties of the cement-based materials. After 28 days, compared to ordinary mortar, the flexural and compressive strengths of mortar containing the high-efficiency ICA increased by 17.1% and 11.6%, respectively, while the chloride ion diffu...