How to Verify the Carbonation Resistance of a Manufacturer's GRC Products?

In the field of architectural decoration, GRC (Glass Fiber Reinforced Concrete) is widely used in high-end projects such as grand theaters, commercial complexes, and landmark buildings, thanks to its lightweight, high strength, and rich design versatility. However, the carbonation resistance of GRC products directly affects their durability and service life, making it a core indicator of concern for designers, owners, and developers when selecting materials. As a Qinglong manufacturer with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, today we will share how to scientifically verify the carbonation resistance of GRC products to support material selection decisions for your projects.

### I. The Importance of Carbonation Resistance for GRC Projects Carbonation of GRC materials refers to the reaction between carbon dioxide in the air and calcium hydroxide in the concrete, which reduces the material's alkalinity, increases the risk of steel reinforcement corrosion, and ultimately affects structural stability. Especially in humid, foggy, or industrial environments, GRC components with insufficient carbonation resistance may develop surface powdering and cracking problems within 5-10 years. Qinglong GRC manufacturer treats carbonation resistance as a core indicator from the detailed design stage, ensuring long-term product durability in various environments through material formulation optimization and process control. For more industry information: +WeChat qlfsbl123

### II. Four Key Steps to Verify the Carbonation Resistance of GRC #### 1. **Raw Material Quality Control: Building a Foundation for Carbonation Resistance from the Source** The carbonation resistance of quality GRC begins with raw material selection. Qinglong's production base uses high-strength low-alkali cement (alkali content ≤0.6%), alkali-resistant glass fiber (zirconia content ≥16%), and specialized mineral admixtures, optimizing the mix ratio through orthogonal testing to increase matrix density by more than 30%. Compared with ordinary GRC, the initial carbonation depth of Qinglong GRC can be controlled within 0.5mm, laying a solid foundation for carbonation resistance.

#### 2. **Laboratory Accelerated Carbonation Testing: Simulating Long-Term Natural Aging** In accordance with the Technical Standard for Building Applications of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong conducts accelerated carbonation testing on each batch of GRC products: in an environment with a temperature of (20±2)°C, relative humidity of (70±5)%, and CO₂ concentration of (20±3)%, with continuous testing for 28 days. Qualified products must have a carbonation depth ≤5mm, while Qinglong GRC, optimized through 58 patented technologies, typically achieves a measured carbonation depth of 2-3mm, far superior to the industry standard.

#### 3. **On-Site Sampling Inspection: Ensuring Consistency in Project Applications** For large projects, Qinglong provides on-site sampling inspection services. Technicians randomly extract samples from installed GRC components, measure the carbonation depth using the phenolphthalein indicator method, and compare the results with laboratory data. For example, in a landmark building project, the error between the on-site carbonation depth of Qinglong GRC and factory inspection was ≤0.3mm, verifying the stability of production and construction. For more industry information: +WeChat qlfsbl123

#### 4. **Long-Term Project Case Tracking: Performance Witnessed in Real Environments** The ultimate verification of carbonation resistance comes from the long-term performance of actual projects. For projects Qinglong participated in, such as the Dongguan Women and Children's Activity Center (completed in 2018) and the Nanjing East Road Century Plaza renovation project (completed in 2020), regular follow-up inspections show that the surface carbonation depth of GRC components increases by ≤0.2mm per year, demonstrating their excellent carbonation resistance in natural environments. These cases also provide intuitive selection references for designers and owners.

### III. Core Advantages of Qinglong's GRC Carbonation Resistance Technology As a national high-tech enterprise and a participant in GRC industry standard development, Qinglong has built a carbonation resistance assurance system through full-chain control of "materials-process-testing": - **Material Innovation**: Self-developed nano-scale mineral admixtures fill matrix pores and reduce the CO₂ permeation rate; - **Process Upgrade**: Vacuum high-pressure molding technology increases the density of GRC components to over 98%; - **Intelligent Inspection**: AI visual recognition systems monitor bubbles, cracks, and other defects in real time during production, reducing carbonation pathways at the source.

### Conclusion Verifying the carbonation resistance of GRC products requires a multi-dimensional approach, from raw materials and laboratory testing to on-site verification and long-term case tracking. As a GRC manufacturer with 28 years of deep industry experience, Qinglong has always upheld the mission of "Creating Beautiful Architecture," providing customers with GRC solutions that combine aesthetic appeal and durability through technological innovation and rigorous quality control. Choosing GRC products that meet carbonation resistance standards is not only a guarantee of project quality, but also an investment in the long-term value of buildings.