Research progress on influence of internally incorporated permeable crystalline materials on durability of cement concrete

Abstract

[Objective] The durability of cement concrete is crucial for the health and service life of hydraulic engineering structures. Permeable crystalline materials can effectively densify the cement concrete and enhance its impermeability through precipitation/complexation-precipitation reactions, thereby improving concrete durability and extending its service life. [Methods] Based on the introduction to the composition and action mechanisms of permeable crystalline materials, the influence of internally incorporated permeable crystalline materials on concrete durability is summarized in terms of impermeability, chloride ion penetration resistance, sulfate erosion resistance, crack resistance, frost resistance, and self-healing performance of cracks. Current engineering application status of permeable crystalline materials is discussed, and recommendations for future research and development are proposed. [Results] The results show that permeable crystalline materials can enhance concrete impermeability and chloride ion erosion resistance by promoting the formation ofcrystalline substances and refining the pore structure of cement concrete. In sulfate environments, permeable crystalline materials compete with sulfate ions for calcium ions, reducing the formation of gypsum and ettringite and consequently mitigating concrete erosion damage. Additionally, these materials enhance crack resistance and frost resistance of concrete. Currently, the application of permeable crystalline materials in engineering is primarily external coating, while internally incorporated applications remain relatively rare. [Conclusion] Based on the current research status, studies on the influence of internally incorporated permeable crystalline materials on the volume deformation and carbonation resistance of concrete are scarce, indicating the need for systematic studies in the future. Concrete cracking is an important factor in durability deterioration. The relationships and models between cracks and durability can be established to evaluate the influence of crack self-healing on durability. Research on the durability of cement concrete requires long-term testing. In the future, data-driven method can be combined to achieve result prediction and thus improve testing efficiency.

Keywords

cement concrete / permeable crystalline materials / durability / engineering application / pore structure / impermeability / influencing factors / self-healing performance of cracks