How to Prevent Rapid Moisture Evaporation in GRC Facades in Hot Climates: Key Techniques and Practical Strategies

In construction projects in high-temperature regions, GRC exterior wall materials are widely applied for combining aesthetic form with structural stability. However, how to solve problems such as cracking and insufficient strength caused by excessively rapid moisture evaporation has become a focal point of industry attention. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group has leveraged its full-chain technical advantages to accumulate systematic solutions across hundreds of projects in high-temperature regions. This article provides a comprehensive analysis of the core anti-evaporation technologies for GRC exterior walls, covering material optimization, process innovation, and construction management.

1. Challenges of High-Temperature Environments for GRC Exterior Walls and Analysis of Material Properties

In high-temperature environments with strong ultraviolet radiation, the moisture evaporation rate in GRC materials can increase by 3-5 times, easily causing problems such as surface drying shrinkage cracks and loose internal structures. Qinglong GRC adjusts the glass fiber content (optimized to 4.5%-5.5%) and the cement-based mix proportion, and adopts specially formulated low-hydration-heat Portland cement, improving the material's water retention performance by more than 20%. Meanwhile, nano-scale mineral admixtures are introduced to form a dense microstructure. Tests by the Materials Laboratory of Guangxi University show that its 28-day flexural strength can reach 22MPa, far exceeding the industry standard of 15MPa, providing a solid foundation for high-temperature construction.

2. Core Technologies: Full-Process Control from Material Modification to Intelligent Curing

In the material production stage, Qinglong innovatively adopts "dual-blending technology"—combining polypropylene fibers with basalt fibers—to synergistically enhance the crack resistance and toughness of GRC components. For high-temperature construction, a specially developed retarding admixture extends the initial setting time to 6-8 hours, ensuring a sufficient operation window during pouring and molding. In a commercial complex project in Guangdong, this technology raised the first-time forming pass rate of exterior wall components to 98%, reducing repair work by 30% compared with traditional processes.

The curing stage is key to anti-evaporation. Qinglong's independently developed intelligent curing system uses temperature and humidity sensors to regulate the curing environment in real time, automatically maintaining relative humidity at 90%±5% and controlling temperature at 25-30°C inside the curing sheds at its Nanning production base. Combined with the "double insurance" measures of mist spraying and water-retention film covering, the moisture evaporation rate of components is reduced by 40%, effectively preventing early shrinkage cracks.

3. Construction Practice: Standardized Operation Strategies under High-Temperature Conditions

On-site construction must follow the principle of "avoiding peak heat." Qinglong recommends installing GRC components in high-temperature regions between 6:00-10:00 and 16:00-20:00 daily, while pre-spraying water on the base walls for cooling to reduce moisture loss caused by interface temperature differences. For joint treatment, Qinglong's specially made elastic sealant is adopted, offering weather resistance from -40°C to 80°C; it has withstood long-term tests in high-temperature and high-humidity environments in a coastal project in Sanya, Hainan.

As a contributing editor of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong has distilled 28 years of engineering experience into a standardized construction manual, covering full-process control from incoming material inspection (implementing flexural strength sampling at 300m² per batch) to 72-hour moisture-retention curing after installation, ensuring project quality stability in high-temperature environments.

4. Long-Term Assurance: The Value of Qinglong's Full-Chain Service

The durability of GRC exterior walls in high-temperature regions depends on systematic after-sales maintenance. Qinglong's "three-tier inspection" mechanism conducts professional inspections at 1 month, 1 year, and 3 years after project completion, using infrared thermal imagers to detect internal hollowing and special repair mortar to treat minor cracks. This full-chain service model of "design deepening + manufacturing + construction and installation + after-sales maintenance" has been verified in overseas high-temperature projects in Malaysia, Saudi Arabia, and other countries, demonstrating the technical strength of China's new building materials enterprises.

In the face of extreme heat challenges brought by global climate change, anti-evaporation technology for GRC exterior walls will become an important guarantee of building quality. With the R&D strength of a national high-tech enterprise, Qinglong Group continues to drive material innovation and process upgrades, committed to providing designers and owners with solutions that combine aesthetic value with engineering reliability, ensuring that every building retains its enduring quality even in high-temperature environments.