Self-waterproofing of concrete structures is the foundation of waterproofing; starting from January 1, 2026, the national standards for self-waterproofing materials for concrete structures will come into effect!
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Starting from January 1, 2026, the latest national standard GB/T18445-2025 \"Cement-based penetrating crystalline waterproofing materials\" will come into effect. It defines for the first time the \"self-repair capability\" of rigid waterproofing materials for concrete structures, and specifies technical requirements and testing methods, thereby guiding the transition from \"passive waterproofing\" to \"active repair\" and promoting the development of rigid self-waterproofing technologies. For a long time, due to various factors such as market conditions and technology, when it comes to waterproofing projects, the first thing that comes to mind is the addition of various waterproof layers; the importance of the structure’s inherent waterproofing properties is not given enough attention. The service life of these additional waterproof layers is limited, far shorter than the design lifespan of the structure, and once they fail, it leads to persistent leakage problems that are difficult to resolve. In recent years, the industry has reached a consensus on the importance of self-waterproofing in concrete structures. The highest standard for waterproofing, namely the \"General Code for Waterproofing in Building and Municipal Engineering\" GB55030-2022, stipulates that the design service life for waterproofing in underground projects should not be shorter than that of the structural design itself. Since no other additional waterproofing measures can ensure a lifespan equal to that of the structure, self-waterproofing of concrete structures is the fundamental solution for waterproofing.
Cement-based penetrating crystalline waterproofing materials are further divided into “cement-based penetrating crystalline waterproofing agents” and “cement-based penetrating crystalline waterproofing coatings”. Cement-based penetrating crystalline waterproofing agents are used by incorporation; they are added as admixtures during the concrete mixing process, in accordance with the specified proportions. Cement-based penetrative crystalline waterproof coating is applied externally; after the concrete has been poured and set, it is evenly applied as a waterproof layer on the surface. Crack self-healing materials, especially when used in the coating method, appear to act as an additional waterproof layer on the surface. However, they differ fundamentally from traditional flexible waterproof layers. These crack self-healing materials penetrate into the concrete and undergo hydration crystallization; this process is known as \"penetration crystallization\". By doing so, they heal cracks while also becoming part of the concrete itself, thus having a lifespan that is consistent with that of the structure.
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