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

The durability of building materials directly affects the safety and lifespan of buildings. For GRC (Glass Fiber Reinforced Concrete), a material widely used in high-end architectural decoration, carbonation resistance is a key indicator of quality. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will provide a professional analysis of how to scientifically verify the carbonation resistance of GRC products, offering a practical guide for designers, owners, and purchasers.

I. The Importance of GRC Carbonation Resistance: Why It Is the "Invisible Guardian" of Building Durability

Concrete carbonation refers to the reaction between carbon dioxide in the air and cement hydration products, forming calcium carbonate, which reduces the alkalinity of the material and causes steel reinforcement corrosion, ultimately compromising structural stability. Thanks to the incorporation of glass fibers and special formulations, GRC products offer better carbonation resistance than ordinary concrete. However, product quality varies across the market, so strict testing is required to ensure performance. At the detailed design stage, Qinglong GRC enhances carbonation resistance through optimized material formulations (such as composite mineral admixtures and high-efficiency water reducers). Its GRC components have withstood more than 10 years of wind and rain in landmark projects across multiple regions, with carbonation depth still controlled within 0.5mm.

II. Interpretation of Authoritative Standards: Testing Basis and Indicators for GRC Carbonation Resistance

Verifying the carbonation resistance of GRC requires compliance with industry standards. Currently, China mainly refers to the "Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC)" (JGJ/T423-2018). This standard clearly stipulates that GRC specimens must undergo accelerated carbonation for 28 days in an environment of (20±2)°C, relative humidity (70±5)%, and CO₂ concentration (20±3)%, with a carbonation depth of no more than 5mm. As a participating unit in the formulation of this standard, Qinglong's laboratory is equipped with fully automatic carbonation test chambers that accurately simulate carbonation processes under different climate conditions, ensuring that test data closely matches actual engineering conditions.

III. Three-Step Verification Method: Full Process Control from Laboratory Testing to Engineering Practice

1. Raw Material Selection and Mix Ratio Optimization The carbonation resistance of high-quality GRC starts at the source. In production, Qinglong uses low-alkali sulfoaluminate cement combined with active admixtures such as silica fume and fly ash, while strictly controlling the water-cement ratio (≤0.4) to form a dense microstructure. In addition, alkali-resistant glass fibers (content ≥4%) are used to reinforce the interfacial transition zone, effectively blocking CO₂ penetration paths.

2. Laboratory Accelerated Carbonation Testing Using standard testing methods, Qinglong conducts carbonation resistance testing on every batch of GRC products. Taking a commercial complex project as an example, its GRC exterior wall panels showed a carbonation depth of only 2.3mm after 28 days of accelerated carbonation, far exceeding the standard requirements, with no surface cracking or powdering. Compared with similar products in the industry, Qinglong GRC's carbonation resistance is on average more than 30% higher.

3. Engineering Examples and Long-Term Tracking Practice is the best test of performance. The Dongguan Women and Children's Activity Center project undertaken by Qinglong (winner of the Silver Award of the First GRC Construction Engineering Innovation Award) has used GRC decorative components for 8 years. Regular testing shows that the annual growth in carbonation depth is less than 0.1mm, with good structural integrity. In addition, the company has established after-sales maintenance records for its projects, providing customers with full life-cycle performance assurance through regular follow-up visits and testing.

IV. Core Advantages of Qinglong GRC: Technical Expertise and Full-Chain Service Assurance

As a national high-tech enterprise and a member of the International GRC Association, Qinglong has a provincial-level R&D center and 58 patented technologies, achieving integrated control from material R&D to construction and installation. With an annual production capacity of 600,000 square meters, the company can meet the demands of large-scale projects. Through BIM technology and modular installation, Qinglong ensures that GRC components fit precisely into complex architectural shapes, reducing performance loss caused by on-site cutting. Whether for municipal engineering or overseas projects, Qinglong always adheres to the philosophy of "meticulousness and the pursuit of excellence," providing customers with GRC solutions that combine aesthetic value and durability.

When selecting GRC products, carbonation resistance is a hard indicator that cannot be overlooked. Only through scientific testing methods, authoritative standards, and reliable manufacturer capabilities can architectural decoration satisfy both present design aesthetics and future structural safety. With 28 years of professional experience, Qinglong Group is committed to providing the industry with superior GRC products and technical support, jointly creating architectural beauty.