How to Prevent Rapid Moisture Evaporation in GRC Exterior Walls in High-Temperature Regions: Material Selection and Construction Process Optimization Strategies

In building facade projects in high-temperature regions, GRC materials are widely used for their lightweight, high-strength properties and design flexibility. However, excessively rapid moisture evaporation in hot environments can easily lead to problems such as component cracking and reduced strength. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group—based on the practice of hundreds of projects in high-temperature regions—has developed a systematic solution, from material formula optimization to construction process innovation, helping designers and owners overcome the challenges of high-temperature construction.

Core Challenges of High-Temperature Environments for GRC Facades

When ambient temperatures exceed 35°C, traditional GRC materials are prone to rapid surface hardening and uneven internal moisture distribution during the casting and forming stage, resulting in shrinkage cracks. Data from a commercial complex project in South China showed that the surface cracking rate of GRC components without temperature-control measures reached as high as 12%, while the accumulation of cement hydration heat at high temperatures further intensifies internal stress and compromises structural durability. Testing by Qinglong Group's laboratory under simulated extreme conditions of 50°C found that the optimized GRC formula improved crack resistance by 40%, thanks to the dual regulation of both material composition and construction processes.

Material Selection: Controlling Moisture Evaporation at the Source

For high-temperature environments, Qinglong GRC adopts "dual-admixture technology" to optimize its formula: polypropylene fibers and modified starch ether are incorporated together, with the former suppressing plastic shrinkage cracks and the latter extending water retention time to over 6 hours. For aggregate gradation, continuously graded quartz sand is selected to reduce porosity, combined with a dedicated retarding water reducer that keeps the initial setting time within 4-6 hours, meeting the construction window requirements in high temperatures. Compared with traditional mixes, Qinglong's high-temperature-specific GRC reduces the drying shrinkage value to 0.03% and increases flexural strength to 18MPa, passing the highest-grade testing under the Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings (JGJ/T 423-2018).

Construction Process Innovation: Full-Process Temperature-Control Solution

In the production stage, Qinglong adopts a "nighttime precasting + cold-chain transport" model, strictly keeping the casting temperature below 25°C. During on-site installation, an innovative "three-stage curing method" is applied: mist spraying during the initial setting period (once every 2 hours), covering with water-retentive cotton film after final setting, and maintaining surface humidity ≥90% throughout the 7-day curing period. In a landmark project in Saudi Arabia, this process achieved a 99.6% pass rate for GRC facade panel installation. For irregularly shaped components, Qinglong uses BIM technology for pre-assembly to reduce moisture loss from on-site cutting, combined with custom sunshades that lower the construction environment temperature by 5-8°C.

Full-Chain Services Ensuring High-Temperature Construction Quality

As a National High-Tech Enterprise, Qinglong has established a full-process control system spanning from detailed design to after-sales maintenance. In the design stage, thermal simulation software is used to optimize component thickness and reinforcement; in production, automated production lines ensure mix ratio precision; and construction teams are equipped with infrared thermometers for real-time surface temperature monitoring. For projects in high-temperature regions, Qinglong provides dedicated technical solutions—for example, in an airport project in Southeast Asia, by adjusting cement content and glass fiber dosage, GRC components maintained stable performance even under exposure to direct sunlight at 60°C. The "four-dimensional quality control standard" distilled from 28 years of industry experience ensures that every square meter of GRC facade withstands the long-term test of high-temperature environments.

Quality control of GRC facades in high-temperature regions is, in essence, the collaborative innovation of materials science and engineering management. Backed by 58 patented technologies, Qinglong Group deeply integrates the performance advantages of UHPC/GRC/GRG/GRP materials with the demands of high-temperature construction, not only solving the moisture evaporation challenge but also creating building skins that combine "aesthetics with durability" for clients through full-chain services. In the field of new architectural decorative materials, only by rooting technological innovation in engineering practice can we truly fulfill the mission of "creating beautiful architecture."