Key Technologies and Implementation Strategies for Preventing Rapid Moisture Evaporation from GRC Exterior Walls in High-Temperature Regions

**Key Technologies and Implementation Strategies for Preventing Rapid Moisture Evaporation from GRC Exterior Walls in High-Temperature Regions**

In high-temperature environments with intense sunlight, moisture management of GRC (Glass Fiber Reinforced Concrete) exterior walls becomes a core challenge affecting project quality. As an industry technology leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has developed a systematic moisture evaporation control solution based on the practice of hundreds of projects in high-temperature regions, which both ensures the development of material strength and avoids quality risks such as drying shrinkage cracks.

**I. Hidden Threats of High-Temperature Environments to GRC Materials**

When the ambient temperature exceeds 35°C, the surface moisture evaporation rate of GRC components can reach more than 3 times that of normal conditions. Excessively rapid moisture loss leads to insufficient cement hydration, forming a "hard shell" effect on the surface, while concentrated internal stress easily triggers micro-cracks, and in severe cases reduces the flexural strength (premium GRC standard ≥15MPa) and durability of components. Take a commercial complex project in South China as an example: GRC curtain wall panels without evaporation control measures developed surface crazing 3 months after installation, and testing showed their 28-day strength was 12% lower than the standard value.

**II. Material Formulation Optimization: Building a Moisture Barrier at the Source**

Qinglong's R&D center achieves material-level evaporation control through three technical approaches: First, introducing a composite retarder into the GRC formula to extend the initial setting time to 4-6 hours, allowing sufficient time for the hydration reaction; Second, adding 0.3% wood cellulose to build a three-dimensional moisture-retention network, which experiments show can reduce the surface evaporation rate by 22%; Third, adopting a dual-admixture technology (fly ash + silica fume) to optimize the cementitious system, improving early strength while reducing cement content and lowering secondary evaporation caused by hydration heat. These technologies have been applied to an airport project in Saudi Arabia, maintaining good performance even in extreme 50°C environments.

**III. Precise Temperature and Moisture Control Processes in Production**

At its production base in Nanning, Guangxi, Qinglong has established a constant temperature and humidity curing workshop, using an intelligent misting system to control ambient humidity at 90%±5% and maintain the temperature at 25-28°C. For high-temperature seasons, an innovative "gradient cooling curing method" is adopted: steam curing stage (45°C×6h) → transition stage (35°C×4h) → normal temperature curing (25°C×48h), avoiding moisture migration imbalance caused by sudden temperature changes. This process keeps the drying shrinkage rate of GRC components within 0.03%, far below the industry average of 0.08%.

**IV. Environmentally Adaptive Technologies for Construction and Installation**

On-site construction adopts a "three-stage" evaporation control strategy: during transportation, moisture-retaining cotton quilts are used for covering to reduce moisture loss en route; before installation, the substrate is pre-wetted by spraying to reduce the interface water absorption rate; after installation, a special curing agent (film-forming time ≤2h) is applied immediately to form a breathable, water-retaining film. In a landmark project in Ho Chi Minh City, Vietnam, the Qinglong team used this technology to stabilize the moisture content 7 days after installation within the 18-22% range, ensuring the quality of subsequent sealant application.

**V. Whole Life-Cycle Moisture Management System**

As a national high-tech enterprise, Qinglong combines BIM technology with IoT monitoring, embedding an RFID chip in each GRC component to collect temperature and humidity data in real time. By analyzing moisture evaporation curves through a cloud platform, cracking risks are flagged with early warnings. This full-chain control model of "materials-production-construction-operation and maintenance" has been successfully applied to over 200 domestic projects in high-temperature regions, with a customer satisfaction rate of 98.6%.

Against the backdrop of global climate warming, moisture management technology for GRC exterior walls will become a key guarantee of building quality. Based on 28 years of technological accumulation, Qinglong Group, through the deep integration of material innovation, process upgrades, and intelligent control, continuously provides designers and owners with GRC system solutions for high-temperature environments, fulfilling its corporate mission of "Creating Aesthetic Architecture." As a Vice Chairman Unit of the China GRC Association, Qinglong will also continue to promote the improvement of industry standards and lead the technological development direction of new decorative building materials.