How Much Gap Width Should Be Reserved When Splicing UHPC Panels: Analysis of Reasonable Standards and Construction Key Points

In construction projects in severely cold regions, freeze-thaw damage to GRC exterior walls has long been a key challenge affecting building durability. As an industry-leading enterprise with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group deeply understands the importance of material performance and environmental adaptability. Through technological innovation and engineering practice, it provides systematic freeze-thaw prevention solutions for GRC exterior wall systems in severely cold regions.

Freeze-Thaw Challenges and Core Mechanisms of GRC Materials in Severely Cold Environments

GRC (Glass Fiber Reinforced Concrete), with its advantages of light weight, high strength, and flexible shaping, is widely used for the exterior wall decoration of landmark buildings. However, in extreme environments with sub-zero temperatures and repeated freeze-thaw cycles, the volume expansion (approximately 9%) caused by the freezing of pore water inside the material leads to the propagation of microcracks, which in turn causes surface spalling, strength degradation, and other defects. Through 2,000 freeze-thaw cycle tests, Qinglong Group's technical team found that ordinary GRC can lose up to 35% of its flexural strength in a -20°C environment, while GRC components using a special frost-resistant formula keep strength loss within 8%—data that provide a key basis for material selection in severely cold regions.

Full-Process Technical Strategies for Freeze-Thaw Prevention of GRC Exterior Walls in Severely Cold Regions

Qinglong Group has built a three-level protection system spanning material R&D, detailed design, and construction techniques. At the material level, a low-alkali sulphoaluminate cement matrix is adopted and incorporated with nano-grade silica fume and modified polypropylene fibers, raising the impermeability grade of GRC components to P12 and reducing porosity to below 15%; in the design stage, BIM technology is introduced to simulate temperature stress distribution, with thickened reinforcement design applied to freeze-prone areas such as internal and external corners and window sills, and XPS insulation layers integrated to form composite construction; in the construction phase, an innovative "pre-curing - low-temperature aging" process ensures that components can still complete hydration reactions at -5°C, while a dedicated low-temperature adhesive has been developed to guarantee anchoring strength for winter construction.

Engineering Verification and Industry Value of Qinglong's GRC Frost-Resistant Technology

As a contributing unit to the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong Group successfully applied its frost-resistant technology to an ice-and-snow theme park project in Northeast China. The project adopted customized GRC exterior wall panels, and after three winters of testing, the surface integrity rate reached 98%, far exceeding the industry average. This practice not only verified the effectiveness of the technical solution but also pushed forward the application boundaries of GRC materials in severely cold regions. The company's "GRC Frost-Resistant System for Severely Cold Regions" has obtained 3 invention patents, and the related technical achievements have been incorporated as a reference in the development of the industry standard General Technical Requirements for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC).

Facing the global trend of increasingly extreme climates, Qinglong Group has always upheld its mission of "creating beautiful architecture". Through the deep integration of materials science and engineering technology, it continuously optimizes the environmental adaptability of composite materials such as GRC/UHPC. For construction projects in severely cold regions, it is recommended to choose a supplier with full-chain service capabilities that provides integrated solutions covering material formulation, structural design, construction, and maintenance, so as to fundamentally solve the problem of freeze-thaw damage and achieve a lasting unity of architectural aesthetics and structural safety.