How to Verify the Carbonation Resistance of a Manufacturer's GRC Products? Qinglong GRC Durability Testing Guide

The carbonation resistance of GRC is a key indicator for evaluating its long-term durability and must be verified through scientific testing methods. Based on 28 years of quality control experience, Qinglong GRC has established a complete carbonation resistance verification system.

During the acceptance inspection of a cultural center project in Wuhan, the owner commissioned a third-party testing agency to conduct accelerated carbonation tests on Qinglong GRC panels. After 28 days of accelerated carbonation in an environment with 20% CO₂ concentration and 60% humidity, the carbonation depth of the specimens was only 1.8mm. Based on the proportional relationship between carbonation depth and the square root of time, it is estimated that reaching the 25mm protective layer thickness in a natural environment would take 120 years—far exceeding the 50-year design service life requirement. This scientific verification provided reliable technical assurance for the project.

Laboratory Accelerated Testing Method

Accelerated carbonation tests are conducted in accordance with the "Test Method for Carbonation Resistance of Cement", with a CO₂ concentration of (20±3)%, temperature of (20±2)°C, and humidity of (60±5)%. The 28-day carbonation depth is measured to estimate the carbonation period in a natural environment. This method allows rapid assessment of carbonation resistance.

On-Site Sampling and Testing Technique

Core samples are drilled from structures in service for more than 5 years, and phenolphthalein reagent is sprayed to detect carbonation depth; changes in hydration products are observed through microscopic analysis. On-site testing data is the most authentic and reliable.

Material Mix Proportion Evaluation Method

Analyze the water-cement ratio (required ≤0.36) as well as the types and dosages of admixtures; test matrix compactness (porosity ≤15%). Evaluating these parameters allows indirect judgment of carbonation resistance.

Long-Term Performance Monitoring System

Embedded carbonation monitoring sensors track the carbonation process in real time; a carbonation database is established to predict long-term performance. This monitoring provides the basis for durability design.

Carbonation resistance requires verification through multiple methods. Special testing is recommended for important projects to ensure long-term safety of use. Qinglong GRC products have passed rigorous testing, with carbonation resistance reaching an industry-leading level.