How to Prevent Rapid Moisture Evaporation of GRC Exterior Walls in High-Temperature Regions: Practical Protection Strategies and Key Technical Points

In construction projects in high-temperature regions, moisture management of GRC exterior wall materials is a key factor in ensuring construction quality and durability. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group, with its full-chain technical experience, deeply understands the unique challenges that high-temperature environments pose to GRC exterior walls. This article systematically analyzes practical solutions for controlling moisture evaporation in GRC exterior walls in high-temperature regions—from material properties and construction techniques to curing strategies—providing professional technical reference for designers and owners.

In high-temperature environments, the moisture evaporation rate of GRC materials increases by more than 30% compared with normal-temperature conditions, easily leading to problems such as surface cracking and reduced strength of components. GRC (glass fiber reinforced concrete) is a lightweight, high-strength composite material whose hydration reaction must be completed in an environment with suitable humidity, while sustained high temperatures disrupt the moisture balance and affect the formation of the material's microstructure. Experimental data from Qinglong Group's Nanning production base shows that when the ambient temperature exceeds 35°C, the surface cracking rate of unprotected GRC test blocks reaches as high as 22%, far higher than the 3% under normal-temperature conditions.

GRC Material Formulation Optimization: Key Technical Points for High-Temperature Adaptability

To address high-temperature climates, Qinglong's R&D team achieves moisture regulation through scientific proportioning of material components. Introducing retarding water reducers into the cementitious material system extends the initial setting time to 4-6 hours, reserving ample time for construction operations; adding 0.05% water-retaining agent raises the water retention rate of the GRC mix to over 90%. In addition, a quartz sand gradation with particle sizes of 0.1-0.3mm is used to reduce aggregate voids and slow the rate of moisture migration. These technical innovations have been applied to a landmark project in Malaysia, successfully solving construction challenges caused by the local sustained high temperatures.

Construction Process Protection: Process Innovation in High-Temperature Environments

In the production stage, Qinglong adopts a “pre-curing + gradient cooling” process: after components are formed, they are first cured for 12 hours in a constant-humidity workshop at 25°C and then moved to the natural environment, where shading canopies and mist spray systems keep surface temperatures within 30°C. During the on-site installation stage, a “morning-and-evening construction method” is practiced to avoid the high-temperature midday period, and installed GRC panels receive full-coverage moisture-retention curing, with the curing period extended from the usual 7 days to 10 days. In a commercial complex project in Saudi Arabia, this process achieved a 98% first-pass acceptance rate for exterior wall GRC installation.

Long-Term Protection System: Full-Cycle Management from Materials to Operation and Maintenance

Qinglong Group proposes a three-dimensional protection concept of “materials–construction–operation and maintenance”: on the materials side, specialized anti-crack fibers raise the flexural strength of GRC to 22MPa; on the construction side, an intelligent curing monitoring system regulates temperature and humidity in real time; on the operation and maintenance side, a 5-year regular inspection service is provided. Practice in multiple domestic projects in high-temperature regions has shown that this full-chain solution can extend the service life of GRC exterior walls to more than 25 years, a 40% improvement over the industry average.

As a national high-tech enterprise and a participant in formulating GRC industry standards, Qinglong Group has always responded to environmental challenges through technological innovation. Moisture management of GRC exterior walls in high-temperature regions is essentially a deep integration of materials science and engineering practice. Through formulation optimization, process innovation, and full-cycle management, both architectural aesthetics and structural durability can be ensured. Going forward, Qinglong will continue to deepen its expertise in UHPC/GRC/GRG/GRP material technology, provide more adaptive solutions for building projects in high-temperature regions worldwide, and fulfill its corporate mission of “Creating Beautiful Architecture”.