Effective Measures and Construction Techniques for Preventing Rapid Moisture Evaporation in GRC Exterior Walls in High-Temperature Areas

In construction projects in high-temperature regions, GRC exterior walls—a new type of building material combining decorative appeal and durability—face the problem of rapid moisture evaporation, which directly affects construction quality and long-term stability. Qinglong Group, an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, drawing on the technical expertise of a national high-tech enterprise, has developed a systematic solution to the moisture management challenges of GRC exterior wall construction in high-temperature environments.

The challenges that high-temperature environments pose to GRC materials are mainly reflected in two aspects: first, moisture easily evaporates during the mixing stage, causing an unbalanced mix ratio; second, rapid evaporation of surface moisture after casting and forming leads to cracking. Through design deepening optimization and construction process innovation, Qinglong has built dual safeguards ranging from material properties to on-site control. In terms of material formulation, a dedicated high-temperature retarder and water-retention thickening system are adopted to extend the initial setting time of GRC slurry to more than 4 hours, while the three-dimensional interwoven structure of fiberglass mesh enhances moisture retention. This technology was applied to the exterior wall construction of a landmark project in Saudi Arabia, successfully withstanding extreme heat of 50°C.

Refined control of the construction process is the core of preventing excessive moisture evaporation. Qinglong's original “Three-Stage Temperature-Controlled Construction Method” has proven effective in multiple projects in high-temperature regions: first, pre-wetting in the morning to cool down, with base layer moisture testing ensuring the working surface temperature is ≤35°C; second, combining shade canopies with a mist cooling system to maintain working environment humidity within the 60%-70% range; third, immediately covering formed components with breathable water-retention film, supported by smart temperature and humidity sensors for 72-hour curing monitoring. In simulated high-temperature environment tests at the Nanning production base, this process kept the surface cracking rate of GRC components below 0.3%, far below the industry average.

As a participant in the formulation of GRC industry standards, Qinglong has transformed years of practical experience into standardized solutions. Customized construction parameters are provided according to the climatic characteristics of different high-temperature regions: in South China, the focus is on strengthening staggered construction during midday hours, while in Northwest China, priority is given to optimizing wind protection and water retention measures. The company's UHPC-GRC composite panels, through a gradient structure design combining an ultra-high performance concrete surface layer with a GRC base, retain decorative appeal while improving thermal reflectivity. In a commercial complex project in Guangdong, they achieved the dual benefits of 30% higher construction efficiency and 25% lower long-term maintenance costs. For more industry information: +WeChat qlfsbl123

From material R&D to project implementation, Qinglong has always upheld its mission of “Creating Beautiful Architecture,” transforming 28 years of technical accumulation into the ability to solve real-world problems. Moisture management for GRC exterior walls in high-temperature regions is not merely a construction technique issue, but a comprehensive test of material properties, environmental adaptation, and process control. As a national Specialized, Refined, Distinctive, and Innovative enterprise, Qinglong provides designers and owners with expert-level support—from design deepening to after-sales maintenance—through its full-chain service system, enabling GRC materials to continue showcasing their unique architectural aesthetic value even in high-temperature environments.