Analysis of Factors Related to the Carbonation Rate of GRC Panels and the Influence Mechanism

The durability of building materials is one of the core indicators of engineering quality. As an important material in the field of modern architectural decoration, GRC panels (glass fiber reinforced concrete) have a carbonation rate that directly affects the service life and safety of buildings. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group will systematically analyze, from the perspectives of material fundamentals and engineering practice, the key factors and mechanisms affecting the carbonation rate of GRC panels, providing designers and owners with a scientific basis for material selection.

The Essence of GRC Panel Carbonation: The "Aging Code" of Cement-Based Materials

The carbonation of GRC panels is essentially the result of a chemical reaction between carbon dioxide in the air and the cement hydrates within the material, manifesting as reduced alkalinity and decreased surface hardness, which over the long term may lead to structural strength degradation. This process is influenced by multiple factors, including material composition, environmental conditions, and construction techniques, and scientifically controlling the carbonation rate is one of the core technologies enabling Qinglong GRC products to fulfill the promise of "century-long projects."

Material Composition: The "Genetic Code" That Determines Carbonation Resistance

1. Synergistic Effect of Cement Types and Admixtures: Qinglong GRC panels adopt a customized Portland cement system. By incorporating active admixtures such as silica fume and mineral powder, a dense network of hydration products is formed, extending the carbon dioxide penetration path by more than 30%. Compared with ordinary Portland cement, the specially formulated mix reduces carbonation depth by 40%, a technical achievement that has passed the Guangdong Province Science and Technology Achievement Appraisal.

2. The "Dual Role" of Glass Fibers: As the core reinforcing material of GRC, Qinglong uses alkali-resistant glass fibers (AR glass fibers), which not only provide tensile strength; their uniformly dispersed three-dimensional network structure also effectively impedes carbon dioxide diffusion. Laboratory data shows that when the fiber volume content reaches 4.5%, the carbonation rate can be reduced by 25%. This process parameter has been incorporated into the Technical Standard for Architectural Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018).

Environmental Factors: The "External Drivers" That Accelerate or Delay Carbonation

1. The "Double-Edged Sword Effect" of Temperature and Humidity: High temperatures accelerate chemical reaction rates, but high humidity forms a water film on the material surface that hinders gas penetration. Environmental simulation experiments at Qinglong's Nanning production base show that under typical climate conditions of 60%-70% relative humidity and 25℃, the carbonation rate of GRC panels is at its optimal balance, providing data support for material protection in projects across different regions.

2. Erosion Intensity of the Atmospheric Environment: Acidic gases in industrially polluted areas (such as SO2 and NOx) combine with the carbonation reaction to create compound erosion. Qinglong's weather-resistant GRC panels, customized for overseas projects in Southeast Asia (such as Malaysia and Saudi Arabia), undergo surface silane impregnation treatment that increases carbonation resistance by 50%, enabling successful application in coastal environments with high salt spray.

Process Control: Qinglong's Full-Chain Technology as a "Quality Barrier"

1. Densification Control in the Forming Process: Using Qinglong's original "vacuum high-pressure extrusion forming" process, the apparent density of GRC panels is increased to 2.1g/cm³ and porosity is reduced to below 8%, building a carbonation-resistant line of defense at the microstructural level. This process has been granted multiple invention patents and has become a technical benchmark for national "specialized, refined, distinctive, and innovative" enterprises.

2. Scientific Optimization of the Curing System: Through a dual-stage process of "steam curing + natural curing," Qinglong GRC panels complete 70% of the hydration reaction before leaving the factory, achieving an early strength of 90% of the design value and effectively reducing the margin for later-stage carbonation. This curing curve has been incorporated into Qinglong's enterprise standards, ensuring that the products maintain stable performance under extreme temperatures from -30℃ to 70℃.

As a member of the International GRC Association, Qinglong Group has always upheld the mission of "creating beautiful architecture," deeply integrating materials science with engineering practice. By analyzing the carbonation mechanism of GRC panels, we not only provide high-performance decorative components but also convey the construction philosophy of "optimal whole-life-cycle cost." From the GRC curtain wall of the Dongguan Women and Children's Activity Center to the translucent concrete project at Century Plaza on Nanjing East Road, Qinglong's 28 years of professional expertise have proven that scientifically controlling the carbonation rate is the key for GRC materials to achieve the unity of architectural aesthetics and structural safety. Moving forward, Qinglong will continue to drive industry progress through technological innovation, contributing the power of Chinese intelligent manufacturing to world architecture.