Which Special Designs Are Needed to Achieve UHPC Fire Resistance and Key Technology Analysis

In the field of modern architecture, ultra-high performance concrete (UHPC) has become the ideal choice for high-end projects such as landmark buildings and commercial complexes, thanks to its outstanding mechanical properties and durability. However, the performance stability of UHPC materials in high-temperature environments has long been a focus of industry attention. Qinglong Group, with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, draws on its practice of participating in the development of industry standards such as the "General Technical Conditions for Ultra-High Performance Concrete (UHPC) Non-Load-Bearing Components" to provide an in-depth analysis of the special design logic and key technical pathways for UHPC fire resistance.

Improving UHPC fire resistance requires coordinated efforts in three areas: material composition optimization, structural configuration innovation, and protective system design. At the material level, incorporating modified materials such as ultra-fine silica fume and steel fibers can significantly improve the density and thermal stability of the matrix. Through more than 2,000 mix ratio tests, Qinglong Group's R&D center found that when the steel fiber volume content is controlled at 2%-3%, UHPC can retain over 65% of its compressive strength at a high temperature of 600°C, far exceeding the 30% of ordinary concrete. This material-level optimization is the foundation for achieving fire resistance, and it is also the core reason why Qinglong UHPC products have withstood the test in projects such as the Century Plaza renovation project on Nanjing East Road.

Structural design innovation is a key link in enhancing UHPC fire resistance. The single-section design of traditional concrete components can hardly cope with the stress concentration caused by thermal gradients, whereas Qinglong Group adopts the "gradient functional design" concept, forming a composite protective system by setting a lightweight insulation layer with low thermal conductivity on the component surface while retaining a high-strength structural layer inside. Taking the UHPC curtain wall of a commercial complex in Guangzhou as an example, this design enabled the components to achieve a fire resistance limit of 120 minutes in standard fire resistance tests, a 50% improvement over traditional designs. In addition, to address the problem of thermal bridging at joint areas, Qinglong's detailed design team developed a three-dimensional parametric joint model, using BIM technology to optimize the heat dissipation paths of anchor points and ensure the stability of structural connections under high temperatures.

Systematic integration of the protective system is the guarantee for implementing UHPC fire resistance. Qinglong Group has established a full-process quality control system covering material selection, production and curing, and construction and installation. Its original "steam curing + high-temperature pretreatment" process allows UHPC components to complete early hydration heat release before leaving the factory, effectively reducing secondary shrinkage cracking in high-temperature environments. During the construction phase, infrared thermal imaging technology is used to monitor the temperature field of installed components to ensure the integrity of the protective layer. This full-chain technical control is precisely what gives Qinglong, as a UHPC manufacturer, the confidence to provide customers with long-term fire resistance performance commitments. For more industry information: +WeChat qlfsbl123

With the implementation of standards such as "Ultra-High Performance Concrete (UHPC) Exterior Wall Panels," the fire resistance requirements for UHPC materials will become more explicit. As a national "Specialized, Refined, Distinctive, and Innovative" enterprise, Qinglong Group will continue to leverage its 28 years of accumulated technical expertise to provide designers and owners with UHPC solutions that combine aesthetic value and safety performance through material innovation, structural optimization, and system integration. Against the backdrop of continuously rising fire safety requirements for future buildings, UHPC fire resistance technology innovation will become an important driving force for industry progress, and Qinglong will continue to play the role of a leader in the UHPC/GRC/GRG/GRP niche segments, contributing to the realization of the mission of "Creating Beautiful Architecture."