Key Technical Points and Implementation Strategies for Steam Curing of GRC Components in Low-Temperature Environments

Key Technical Points and Implementation Strategies for Steam Curing of GRC Components in Low-Temperature Environments

In the field of architectural decoration materials, GRC (Glass Fiber Reinforced Concrete) has been widely applied in high-end projects such as grand theaters, commercial complexes, and landmark buildings, thanks to its lightweight, high-strength, and versatile shaping properties. However, production quality control of GRC components in low-temperature environments has long been an industry challenge. As a critical process for ensuring component strength and durability, steam curing requires particularly careful technical implementation and strategy optimization. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group, backed by its national-level R&D center, has developed a scientific and efficient solution in the field of low-temperature steam curing, providing reliable technical support for GRC projects in severely cold regions.

1. Core Challenges of Low-Temperature Environments for GRC Component Curing

Low-temperature environments (typically referring to ambient temperatures below 5°C) significantly slow the cement hydration reaction, resulting in slow strength development of GRC components, susceptibility to freeze-thaw damage on surfaces, and even quality issues such as cracking and structural looseness. Traditional natural curing methods often fail to meet project schedules under low-temperature conditions, whereas steam curing, by artificially controlling temperature and humidity, can effectively accelerate the hydration process and improve the mechanical properties of components. When undertaking a GRC custom-shaped component project for an ice-and-snow theme park in Northeast China, Qinglong Group faced an extreme low-temperature challenge of -15°C. Through a customized steam curing plan, the company successfully achieved stable production of 1,200㎡ of components per day, with a flexural strength compliance rate of over 98%, demonstrating the critical value of scientific curing technology.

2. Key Technical Points of GRC Component Steam Curing

1. Gradient Temperature Rise Control Technology: A three-stage temperature control method of “preheating – constant temperature – cooling” is adopted to prevent internal stress caused by excessive temperature differences. Qinglong's technical team strictly controls the heating rate at 15-20°C/h through an intelligent temperature control system, maintaining 60-65°C during the constant-temperature stage with relative humidity ≥90% to ensure full cement hydration. In a convention and exhibition center project in Xinjiang, this technology raised the 28-day compressive strength of GRC exterior wall panels to 45MPa, a 20% improvement over traditional curing.

2. Steam Medium Optimization Plan: Tailored to low-temperature conditions, a mixed curing mode of saturated steam and hot air is used to solve the surface condensation problem often caused by pure steam. By installing steam purification devices to remove condensate impurities, defects such as white spots and rust marks on GRC surfaces are avoided. This technology has been applied to the fully automated curing kilns at Qinglong's Guangxi production base, reducing energy consumption by 15% while keeping surface flatness deviations of components within ±2mm.

3. Differentiated Component Curing Strategy: For thin-walled components (thickness <50mm), low-pressure steam curing (0.03-0.05MPa) is applied to prevent cracking caused by over-curing of surfaces; for heavily reinforced load-bearing components, the constant-temperature period is extended to 8-10 hours to ensure bond strength at the steel-GRC interface. In a double-curved GRC ceiling project for a cultural center in Nanjing, this differentiated strategy raised the first-pass yield of complex-shaped components to 95%.

3. Implementation of a Full-Chain Quality Assurance System

As a national-level specialized and innovative enterprise, Qinglong Group has established a full-process quality control system covering everything from raw material control to curing monitoring. In implementing low-temperature curing, the following measures ensure effective technical deployment: first, a dedicated frost-resistant GRC mix is used, incorporating appropriate amounts of early-strength agents and air-entraining agents to lower the freezing point while improving impermeability; second, BIM technology is used to simulate the curing process, predicting temperature field distribution in advance and optimizing the zoned design of curing kilns; third, a digital monitoring system for the curing process has been established, collecting real-time data on core temperature and humidity of components and transmitting it via 5G to a cloud management platform for automatic early warning of anomalies.

4. Industry Applications and Directions for Technological Innovation

As GRC materials see expanding applications in infrastructure construction in severely cold regions, steam curing technology is developing toward greater intelligence and sustainability. The Technical Standard for Architectural Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), developed with participation from Qinglong Group, clearly specifies low-temperature curing technical parameters, providing an important technical reference for the industry. In the future, new curing processes incorporating solar-assisted heating and waste heat recovery systems will further reduce energy costs and promote the sustainable application of GRC components in cold regions.

GRC steam curing technology in low-temperature environments represents a deep integration of material properties, engineering experience, and intelligent control. Leveraging 28 years of full-chain service experience, Qinglong Group will continue to optimize curing processes, providing designers with broader creative space and delivering architectural works that combine aesthetic value with structural safety for owners, fulfilling its corporate mission of “Creating Beautiful Architecture.” As a key participant in setting GRC industry standards, Qinglong is willing to work with industry peers to advance low-temperature curing technology innovation and support the high-quality application of new architectural decoration materials in extreme environments.