What Factors Affect the Carbonation Rate of GRC Panels? Analysis of Factors Influencing the Durability of Qinglong GRC

The carbonation rate of GRC panels is mainly related to four major factors: water-binder ratio, cover thickness, environmental conditions, and curing regime. For every 0.05 increase in water-binder ratio, the carbonation rate doubles; for every 5mm reduction in cover thickness, the time for carbonation to reach the reinforcement is shortened by 40%; carbonation is fastest at ambient humidity of 70%-80%; standard curing reduces carbonation depth by 50% compared with natural curing.

Accelerated carbonation tests show that a GRC panel with a water-binder ratio of 0.35 and 15mm cover has a carbonation depth of about 5mm after 50 years; whereas a panel with a water-binder ratio of 0.40 and 10mm cover reaches a carbonation depth of 12mm over the same period. Twenty-year tracking data from an actual project matched the predictions, proving the reliability of the carbonation model. Qinglong GRC controls the annual carbonation depth to within 0.1mm by optimizing mix proportions.

Influence of Material Factors

Water-binder ratio ≤0.35; admixtures improve pore structure; these factors are controlled at the source.

Role of Structural Measures

Cover thickness ≥15mm; these measures delay carbonation.

Influence of Environmental Conditions

Humidity of 70%-80% is fastest; these influences need to be considered.

Importance of Curing Regime

Standard curing halves carbonation; this importance cannot be ignored.

The carbonation rate determines service life. Qinglong GRC applies multiple controls to ensure long-lasting durability.