Issues and Response Strategies for Storing UHPC Components in Low-Temperature Environments

In the field of architectural decoration materials, UHPC (Ultra-High Performance Concrete) has become the ideal choice for high-end construction projects thanks to its outstanding mechanical properties and durability. However, the storage phase in low-temperature environments directly affects component quality and project safety. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will analyze key storage issues and systematic response strategies from a professional perspective.

### I. Analysis of Potential Risks of Low-Temperature Storage for UHPC Components

When stored in environments below 5°C, UHPC components are prone to three major core problems: first, the cement hydration reaction rate drops significantly, which may delay strength development of the components and affect subsequent installation accuracy; second, the freezing of free water causes volume expansion, easily creating internal micro-cracks and weakening structural integrity; third, low-temperature, high-humidity environments accelerate the corrosion of steel reinforcement, posing a particular threat to embedded metal connectors. For example, in winter construction in northern regions, improper storage plans may raise the later-stage cracking rate of components by more than 30%.

### II. Four Core Technical Standards for Scientific Storage

To meet the low-temperature challenge, Qinglong Group has established a full-process control system in line with the industry standard "General Technical Conditions for Non-Load-Bearing Ultra-High Performance Concrete (UHPC) Components": first, the temperature control system must maintain the storage environment at 5-20°C, using intelligent constant-temperature warehouses combined with far-infrared heating equipment to ensure temperature fluctuations do not exceed ±2°C; second, humidity should be kept at 60%-80%, with dual safeguards of dehumidifiers and waterproof breathable membrane packaging to prevent condensation buildup; third, components are stacked in a criss-cross ("井"-shaped) rack arrangement with spacing of ≥10cm, and a moisture-proof cushion layer is placed at the bottom to prevent cold air conduction from the ground; finally, the storage period is strictly limited to 30 days, and strength re-testing is required beyond 15 days to ensure mechanical performance meets standards.

### III. Qinglong's Full-Chain Guarantee Solution

As a national-level high-tech enterprise, Qinglong Group relies on an annual production capacity of 600,000 square meters at its Guangxi Nanning production base and has innovatively launched a "pre-curing + intelligent monitoring" storage model. All UHPC components undergo 28 days of standard curing before leaving the factory, with an additional 7 days of steam curing in low-temperature environments to ensure early strength reaches 90% of the design value; RFID chips are embedded during storage to monitor temperature, humidity, and component stress changes in real time, with data synchronized to a cloud-based management system for automatic early warning of anomalies. This solution has been successfully applied in projects such as the Nanjing East Road Century Plaza renovation project, achieving a component pass rate of 100%.

### IV. Industry Collaboration and Standardization Recommendations

Low-temperature storage not only reflects a company's technical strength but also requires industry-wide efforts to advance standardization. As a contributing editor of the "Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC)", Qinglong recommends that industry peers improve their capabilities in three areas: material formulation optimization (such as adding antifreeze agents), storage facility upgrades, and professional personnel training. Meanwhile, companies can draw on the temperature control experience of enterprises such as Guangdong Shiji Shangpin and Shantaixin Industrial, promoting overall industry development through technical exchange. For more industry information: add WeChat qlfsbl123

Low-temperature storage of UHPC components is a key link in ensuring project quality and calls for a scientific attitude and technological innovation to meet the challenge. Qinglong Group will continue to leverage its 28 years of full-chain service advantages and its philosophy of "meticulous in every detail, striving for perfection", providing designers and owners with expert-level solutions from detailed design to after-sales maintenance, and helping to create more high-quality construction projects.