How UHPC Exterior Walls in Severe Cold Regions Resist Freeze-Thaw Damage: Research on Key Technologies and Application Strategies

### The "Frost-Resistance Code" of Buildings in Severe Cold Regions: Technical Breakthroughs and Practical Pathways of UHPC Facade Systems

In extreme climates of -30℃, ordinary concrete facades may crack and spall due to freeze-thaw cycles, while ultra-high performance concrete (UHPC), with its outstanding material properties, is becoming the "protective armor" of building envelopes in severe cold regions. As an industry player with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group delivers systematic solutions for buildings in cold regions—from material R&D to project implementation—through full-chain technological innovation, redefining facade frost-resistance standards.

#### I. Core Technological Breakthroughs in the Freeze-Thaw Resistance of UHPC Materials

The frost resistance of UHPC facades in severe cold regions stems from their unique material composition and microstructural design. Compared with traditional concrete, the UHPC developed by Qinglong achieves a dense structure with impermeability grade above P20 by optimizing steel fiber content (2%-5% by volume) and nano-scale silica fume filling technology, keeping material porosity below 3%. In temperature cycling tests from -40℃ to 50℃, its frost resistance grade can reach F300 or above, far exceeding the national standard requirement of F200, providing a solid material foundation for building envelopes in the severe cold regions of northern China.

To meet the special needs of severe cold regions, Qinglong's innovatively developed "gradient functional composite facade panels" combine UHPC face layers with thermal insulation core materials through patented interface treatment technology, forming integrated components with combined frost-resistance, insulation, and decorative functions. This technology has been applied to an ice-and-snow themed venue project in Harbin; after three winters of real-world testing, the walls show no cracks or efflorescence, and the thermal bridge effect is reduced by 40% compared with traditional curtain walls, confirming the stability of UHPC materials in extreme environments.

#### II. Systematic Solutions for UHPC Facades in Severe Cold Regions

Successful frost-resistant projects depend not only on the materials themselves, but also on full-chain technical control. Drawing on its end-to-end experience in detailed design, manufacturing, construction, and installation, Qinglong has built a "three-tier protection system" for UHPC facades in severe cold regions: at the material level, low-alkali cement and non-alkali-reactive aggregates are used to prevent internal expansion caused by alkali-aggregate reaction; at the structural level, multiple drainage cavities and breathing-type waterproof joints are designed to ensure that moisture generated by freeze-thaw is discharged in time; at the construction level, an innovative preheating process for winter construction keeps the ambient temperature for component installation above 5℃, ensuring that mortar bond strength meets standards.

As a national high-tech enterprise, Qinglong participated in formulating the industry standard "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)," which sets out material durability indicators and construction technical specifications specifically for severe cold regions. In a municipal project in Changchun, the application of a UHPC sunshade panel system guided by this standard not only achieved structural safety in a -35℃ environment, but the industrialized production of precast components also shortened the on-site construction period by 60%, demonstrating how technical standards enhance engineering efficiency.

#### III. Frost-Resistance Practice from Laboratory to Project Site

Twenty-eight years of industry experience have given Qinglong a deep understanding: a material's frost resistance must be verified in real project environments. For a cultural tourism project in Inner Mongolia, the Qinglong team customized a UHPC and GRC composite stone-look curtain wall system tailored to the local climate of up to 150 freeze-thaw cycles per year. Long-term monitoring through temperature sensors embedded in the components showed that annual deformation was kept within 0.3mm, far below the code limit. The project won the "Northern Region Green Building Innovation Award" and became a benchmark case for UHPC application in severe cold regions.

Facing the challenges of extreme weather brought by global climate change, UHPC materials are redefining the risk resilience of building envelopes with their properties of "high strength, high toughness, and high durability." Qinglong Group will continue its mission of "creating beautiful architecture," providing systematic solutions that combine aesthetic value with structural safety for buildings in severe cold regions through the deep integration of material innovation and engineering practice, so that every building can stand as firm as ever against the test of ice and snow.