Key Issues and Solutions for Storing UHPC Components in Low-Temperature Environments

In the field of architectural decoration, ultra-high performance concrete (UHPC) has become the preferred material for landmark buildings and high-end commercial complexes thanks to its outstanding mechanical properties and durability. However, storage management 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, drawing on the practice of hundreds of projects in severe cold regions, provides the industry with systematic low-temperature storage solutions.

I. Analysis of the Potential Risks of Low-Temperature Environments to UHPC Components

UHPC components in environments below 0℃ are prone to three core problems: first, the cement hydration reaction rate drops sharply, causing delayed strength development and, in severe cases, freeze-thaw damage; second, free water inside the components freezes and expands, creating microcracks that compromise structural integrity; third, uneven evaporation of surface moisture leads to appearance defects such as whitening and sanding. A landmark project in northern China once suffered surface spalling on 30% of its UHPC decorative mouldings due to improper winter storage, with rework costs increasing by nearly 40%.

II. Key Control Points for Low-Temperature Storage of UHPC Components

1. Precise Temperature and Humidity Control: A smart constant-temperature warehousing system keeps the ambient temperature stable at 5-15℃, with relative humidity maintained at 60%-80%. The industrial-grade constant-temperature warehouse at Qinglong's Guangxi production base uses BIM technology to monitor temperature and humidity fluctuations in real time, ensuring that components reach the required strength during the curing period.

2. Anti-Freezing and Moisture-Retention Measures: For components stored for more than 72 hours, a dual protection of flame-retardant insulation cotton wrapping plus electric blanket auxiliary heating is applied. For irregularly shaped components (such as double-curved curtain wall panels), custom insulation supports are made to avoid locally low temperatures.

3. Stacking and Turnover Management: Following the “first in, first out” principle, components are stacked no higher than 1.5 meters, with elastic cushion pads placed between layers. Qinglong's proprietary RFID chip traceability system tracks component storage duration in real time, eliminating the risk of over-extended storage.

III. Industry Practice of the Full-Chain Quality Assurance System

As a national high-tech enterprise, Qinglong has established full-process control standards from material R&D to construction delivery: at the formulation stage, the optimized incorporation of nano-scale silica fume and steel fibers enables UHPC to achieve a 28-day compressive strength of over 150MPa even at 5℃; the production stage adopts a process combining steam curing with natural curing to ensure components meet early strength requirements in low-temperature environments; before installation, the “three-inspection system” is implemented, including strength testing with a rebound hammer, ultrasonic flaw detection, and surface flatness checks.

From the UHPC curtain walls of the Harbin Opera House to the decorative components of the Shenyang Metro, Qinglong has achieved zero-loss delivery of components in environments as low as minus 20℃ thanks to its comprehensive low-temperature storage solutions. Going forward, Qinglong will continue to deepen its research into the application of UHPC materials in extreme environments and, with the mission of “creating aesthetic architecture”, provide global customers with more reliable new decorative building material solutions.