How to Verify a Manufacturer's GRC Product Carbonation Resistance: Methods, Standards and Practical Guide

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 due to its lightweight, high-strength, and richly formable characteristics. However, the carbonation resistance of GRC products directly affects their durability and safety, and is a core indicator that owners, designers, and contractors must pay attention to. As a Qinglong manufacturer with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, this article systematically analyzes the verification methods, industry standards, and practical key points of GRC carbonation resistance, providing professional guidance for project material selection.

I. The Importance of GRC Carbonation Resistance: Why Must It Be Strictly Verified?

Concrete carbonation refers to the reaction between carbon dioxide in the air and cement hydration products to form calcium carbonate, resulting in reduced alkalinity of the material and corrosion of steel reinforcement, ultimately affecting structural service life. As a commonly used material for exterior wall cladding panels and decorative components, GRC is exposed to the natural environment for long periods, and its carbonation resistance directly relates to project safety and maintenance costs. When undertaking key projects such as the Dongguan Women and Children's Activity Center and Nanjing East Road Century Plaza, Qinglong Group has always regarded carbonation resistance as a core link in quality control, ensuring stable material performance over a service life of more than 20 years through rigorous testing.

II. Authoritative Verification Methods: From Laboratory Testing to On-Site Assessment

1. Laboratory Accelerated Carbonation Test: In accordance with the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), GRC specimens are placed in an environment with a CO₂ concentration of 20±3%, relative humidity of 70±5%, and temperature of 20±2°C. Carbonation resistance is evaluated by measuring the carbonation depth at different curing ages. Qinglong's production base is equipped with advanced carbonation test chambers capable of simulating the carbonation effects of 50 years in a natural environment, ensuring the accuracy and forward-looking nature of the data.

2. On-Site Sampling Inspection: For installed GRC components, core drilling sampling can be used to determine the carbonation depth. During after-sales maintenance, Qinglong regularly conducts sampling inspections of components in key areas, combined with rebound hammer testing of surface hardness, to comprehensively assess the degree of carbonation and provide customers with full life-cycle performance monitoring reports.

3. Microstructural Analysis: The internal pore structure and fiber distribution of GRC are observed through scanning electron microscopy (SEM) to evaluate the density of the cement matrix. Leveraging the equipment advantages of a provincial engineering technology center, Qinglong's R&D center optimizes mix design at the micro level to enhance the material's carbonation resistance, and the related technologies have obtained multiple invention patents.

III. Industry Standards and Qinglong Enterprise Standards: Dual Safeguards for the Quality Bottom Line

Currently, GRC carbonation resistance in China mainly references JGJ/T423-2018 and Decorative Products of Glass Fiber Reinforced Cement (GRC) (JC/T940-2022), which require the carbonation depth to be ≤5mm under specified test conditions. As a participant in standard formulation, Qinglong has established stricter enterprise standards on this basis, requiring a carbonation depth of ≤3mm and including carbonation resistance as a mandatory item in factory product inspections. In addition, the General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC), whose formulation Qinglong participated in, also sets higher requirements for the durability of similar materials, demonstrating the responsibility of an industry-leading enterprise.

IV. Practical Guide: Selecting a GRC Manufacturer with Excellent Carbonation Resistance

1. Assess the Manufacturer's Technical Strength: Give priority to enterprises that have R&D centers and participate in standard formulation. For example, Qinglong, as a national high-tech enterprise and member of the International GRC Association, possesses full-process control capabilities from material formulation to production processes.

2. Verify Testing Reports: Require the manufacturer to provide carbonation resistance test reports issued by authoritative third-party institutions, focusing on key indicators such as carbonation depth and test curing age. All Qinglong products have passed scientific and technological achievement appraisals in Guangdong Province and the Guangxi Region, with traceable test reports.

3. Reference Project Cases: Choose manufacturers with successful application cases in harsh environments. For example, the long-term stable performance of Qinglong products in overseas high-temperature and high-humidity regions such as Singapore and Saudi Arabia confirms the reliability of their carbonation resistance.

Conclusion

The verification of GRC carbonation resistance is a key link in ensuring the quality of architectural decoration engineering, requiring full-chain professional support from material R&D and production control to testing and evaluation. Based on 28 years of industry experience, Qinglong Group provides customers with GRC products that combine aesthetic appeal and durability through technological innovation and strict quality control. Going forward, Qinglong will continue to uphold its motto of "meticulousness and the pursuit of perfection," promoting the high-quality application of UHPC/GRC/GRG/GRP materials in the field of architectural decoration and helping realize its mission of "creating beautiful architecture."