Chloride Ion Binding Capacity and Mechanistic Study of OPC-GGBS Cement-based Repair Materials
HE Xiang1,*, ZHANG Yong1, HU Wei1, ZHANG Wei1, NIU Mengdie2, LI Guoxin2
1 PowerChina Northwest Engineering Co., Ltd., Xi’an 710100, China 2 School of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Abstract: As an aluminum-rich mineral admixture, ground granulated blast-furnace slag (GGBS) can enhance the binding capacity of cement-based materials for chloride ions. However, the influence of hydration characteristics of the OPC-GGBS composite system on chloride ion binding behavior remains unclear, which limits its application in marine repair engineering. The effects of GGBS (with a dosage of 0%—50%) on the mechanical properties, expansion behavior, impermeability, hydration heat characteristics, and chloride binding capacity of the composite system were investigated. The mechanism of the hydration process of the composite system on the chloride binding capacity was elucidated through the analysis of chloride adsorption behavior and microstructure of paste samples at different hydration ages and soaking times. The results showed that the mechanical properties and resistance to chloride ion penetration of the OPC-GGBS composite system are significantly improved by GGBS. With the increase of GGBS dosage, the shrinkage of the mortar samples in the dry environment decreases gradually. The enhancement of chloride binding capacity of the composite system by GGBS is attributed to increasing the generation of monosulfoaluminate (AFm) phases, which immobilize more chloride ions by forming Friedel’s salt. The highest chloride binding capacity of the composite system is achieved at the GGBS dosage of 40%.
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2026, Vol. 40 
