How to Prevent Rapid Moisture Evaporation from GRC Exterior Walls in High-Temperature Regions: A Discussion of Key Technologies and Practical Strategies

In high-temperature regions, moisture management of GRC exterior wall materials is a critical factor in ensuring construction quality and durability. As an industry expert with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group is well aware of the particular challenges that high-temperature environments pose to GRC materials, and has developed a systematic moisture control solution through technological innovation and engineering practice.

Analysis of Moisture Evaporation Challenges of GRC Materials in High-Temperature Environments

With intense sunlight and dry air in high-temperature regions, GRC exterior walls are prone to rapid moisture evaporation during construction, resulting in surface cracking, insufficient strength development, and other problems. Data shows that when the ambient temperature exceeds 35°C, the initial setting time of GRC mix is shortened by more than 40%; without effective measures, the later risk of hollowing and delamination will increase by 30%. With a deep understanding of material properties, Qinglong GRC has built a full-process protection system covering raw material formulation, construction techniques, and curing technology.

Material Optimization: Improving Evaporation Resistance at the Source

Qinglong GRC solves the moisture evaporation problem through three technical approaches: first, a special retarding admixture is used to extend the initial setting time to 6-8 hours, securing the high-temperature construction window; second, nano-scale water-retaining components are added to raise the material's water retention rate by 25%, with tests showing its 28-day flexural strength still meets the standard of over 20MPa; third, the glass fiber ratio is optimized by combining alkali-resistant glass fiber with high-grade cement to form a denser microstructure. These innovations have enabled Qinglong GRC to perform excellently in multiple high-temperature projects in South China. For example, during the exterior wall construction of a commercial complex, zero cracking was achieved even when the surface temperature reached 50°C at noon.

Construction Techniques: Dynamically Adjusted Temperature-Adaptive Solutions

To address high-temperature construction, Qinglong established a "time-space dual control" construction standard: in terms of time, a "peak-avoidance construction method" is adopted, with operations scheduled from 5-10 a.m. and 4-7 p.m.; in terms of space, an innovative "mist curing shed" technology is employed, where a smart misting system keeps the humidity of the construction area at 65%-75%, combined with shading nets to reduce surface radiation temperature. In a landmark project in Nanning, this technique raised the early strength compliance rate of GRC components to 98% and saved 30% of curing water compared with conventional construction.

Curing Innovation: Full-Cycle Moisture Management System

Qinglong GRC pioneered a "three-stage curing method": during the initial setting period, a polymer water-retention film is applied, achieving a water-locking rate above 90%; during the hardening period, intelligent spray curing is implemented, with the frequency automatically adjusted according to temperature and humidity sensor data; after forming, a silane impregnation treatment forms a permanent water-repellent protective layer. This system reduces the water absorption rate of GRC exterior walls by 40% in high temperature-difference environments; in a project in Saudi Arabia, it withstood the test of extreme heat of 50°C with no obvious weathering after 5 years.

As a national high-tech enterprise and a participant in formulating GRC industry standards, Qinglong Group has always taken material performance and environmental adaptability as the core of its technology R&D. From the humid heat of the Lingnan region to the desert climate of the Middle East, the technical solutions accumulated by Qinglong GRC through 28 years of engineering practice are providing reliable material solutions for architectural decoration in high-temperature regions worldwide. Going forward, Qinglong will continue to deepen the environmental adaptation technologies for UHPC/GRC/GRG/GRP materials and, guided by its mission of "creating beautiful architecture", drive application breakthroughs for new building materials in extreme environments.