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

The carbonation resistance of GRC products can be verified through four major methods: checking test reports, on-site sampling tests, examining project cases, and verifying technical parameters. Qinglong recommends combining multiple verification methods to ensure data authenticity, avoiding short-term strength deterioration and surface powdering caused by insufficient carbonation resistance, and ensuring long-term stability in use.

1. Check Authoritative Test Reports: Basic Verification Basis

Test reports are the core evidence of carbonation resistance. Request formal reports: test reports must be issued by a CMA-accredited third-party laboratory, clearly stating the carbonation test parameters (test age, carbon dioxide concentration, relative humidity). All Qinglong test reports are CMA-accredited, with complete and traceable parameters; Verify key indicators: focus on the 28-day carbonation depth (≤1mm for quality products) and the 56-day carbonation depth (≤1.5mm). Qinglong GRC achieves a 28-day carbonation depth of ≤0.8mm, far exceeding industry standards; Check report consistency: confirm that the product formulation and production process stated in the report match the products actually supplied by the manufacturer, avoiding "qualified samples but unqualified batches". Qinglong's reports match actual product parameters 100%.

2. On-site Sampling and Third-party Re-testing: Precise Data Verification

On-site sampling tests can prevent report falsification and ensure batch product performance. Sampling method: randomly select finished components from the production line, cut them into 100mm×100mm×100mm specimens, and send them to a third-party laboratory for testing. Qinglong supports on-site random sampling by customers and accompanies the entire testing process; Verify testing procedures: confirm that testing is conducted in accordance with the "Test Method for Carbonation Resistance of Cement-based Composite Materials" (GB/T 50082), including specimen curing, carbonation chamber parameter control, and carbonation depth measurement. Qinglong's testing procedures strictly follow national standards, ensuring accurate data; Comparative result analysis: compare the re-testing results with the report data provided by the manufacturer; a deviation of ≤10% is considered qualified. Qinglong's re-testing pass rate reaches 100%.

3. Examine Project Cases and Technical Parameters: Real-world Verification of Performance

Actual project cases and technical parameters can indirectly confirm carbonation resistance. Inspect aged projects: choose the manufacturer's outdoor projects over 5 years old, check surfaces for powdering, cracking, and discoloration, and measure the carbonation depth (tested on-site with phenolphthalein reagent). Qinglong's projects over 10 years old show a carbonation depth of ≤2mm with no obvious surface deterioration; Verify technical parameters: carbonation resistance is directly related to the water-cement ratio (≤0.45), compactness (≥2.2g/cm³), and mineral admixture content (10%-15%). Require the manufacturer to provide detailed formulation parameters. Qinglong controls the water-cement ratio at 0.40-0.42 and achieves a compactness of 2.3g/cm³, ensuring carbonation resistance; Verify climate adaptability: projects in coastal and industrially polluted areas require additional confirmation of combined carbonation and corrosion resistance. Qinglong has specialized formulations for special climate zones, offering superior carbonation resistance.