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

In the field of architectural decoration, low-temperature environments pose severe challenges to the production quality of GRC components. As an industry-leading enterprise with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group deeply understands the critical role of steam curing technology in the strength development and durability enhancement of GRC components under low-temperature conditions. Based on Qinglong's practical experience at its Nanning production base, this article systematically explores the core technical points and standardized implementation methods for steam curing of GRC components in low-temperature environments, providing actionable solutions for the industry.

The core contradiction in steam curing of GRC components in low-temperature environments lies in balancing the cement hydration rate with the forming quality of components. When the ambient temperature drops below 5℃, conventional curing methods easily lead to stagnation of the hydration reaction, resulting in problems such as insufficient strength and surface cracking. Through more than 20 years of technical accumulation, Qinglong has developed a three-stage curing process of "gradient heating - constant temperature control - slow cooling". Combined with its independently developed intelligent temperature control system, GRC components can retain over 95% of their design strength even at -10℃. For more industry information: +WeChat qlfsbl123

Precise Control of Steam Curing Technical Parameters

The key to steam curing lies in the coordinated control of temperature and humidity. Through extensive orthogonal tests, Qinglong's technical team determined the optimal curing parameters for GRC components in low-temperature environments: initial heating rate ≤15℃/h, constant-temperature stage controlled at 55-60℃, relative humidity maintained above 90%, constant-temperature duration of no less than 8 hours, and cooling rate ≤10℃/h. This parameter system has been successfully applied to multiple winter construction projects in northern China, such as a GRC decorative molding project for an ice and snow sports venue. Third-party testing showed that the components achieved a 28-day flexural strength of 22MPa, far exceeding the industry standard.

Innovative Application of Curing Facilities and Processes

To address the particularities of low-temperature environments, Qinglong has developed a flexible solution combining an enclosed steam curing kiln with mobile curing sheds. The curing kiln adopts a polyurethane insulation layer + stainless steel inner liner structure, with the heat loss rate controlled within 5%; the equipped steam generator features automatic pressure regulation, ensuring steam saturation ≥98%. For large special-shaped components, a customized curing shed combined with zoned steam pipeline layout technology achieves a temperature difference of ≤3℃ across all parts of the components. In an overseas project in Malaysia, this innovative process effectively solved the curing challenges under the low-temperature, high-humidity conditions of the tropical rainy season.

Quality monitoring during the curing process is equally crucial. Qinglong has established a "three measurements, three inspections" system: monitoring the temperature and humidity of the curing environment every 2 hours, testing the core temperature of components every 4 hours, and conducting sampling tests of surface hardness and strength after curing. The curing data platform built with BIM technology allows real-time tracing of the curing curve of each component, ensuring product quality traceability. This rigorous quality control system has earned Qinglong GRC components a "zero complaints" reputation in real estate projects by Vanke, Poly, and others. For more industry information: +WeChat qlfsbl123

Integrated Optimization of Energy-Saving and Environmental Protection Technologies

In practicing the concept of green development, Qinglong has combined steam curing with a waste heat recovery system, using heat exchangers to recover heat from curing exhaust gases for preheating cold water, improving energy utilization by more than 30%. At the same time, low-NOx steam generators are used to control nitrogen oxide emissions below 30mg/m³, meeting the national Class I emission standard. This environmentally friendly curing technology has helped Qinglong successively earn the titles of "Provincial Green Factory" and "Environmental Integrity Enterprise".

As a participating unit in the drafting of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC), Qinglong has always been committed to advancing industry technology. The continuous optimization of low-temperature steam curing technology has not only solved the production challenges of GRC components in special environments, but has also laid a solid foundation for Qinglong to expand into the Northeast, Northwest, and overseas cold-region markets. Going forward, Qinglong will continue its mission of "creating beautiful architecture", providing designers and owners with higher-quality GRC solutions through technological innovation and full-chain services.