Precautions for Using Redispersible Latex Powder in Dry-Mix Mortars During Winter
When undertaking construction during the winter season, the application of redispersible latex powder indeed requires particular care. Low temperatures directly impact the redispersibility and film-forming capabilities of the latex powder, thereby influencing the ultimate performance of the mortar. The following summary outlines the key precautions to help you quickly grasp the essential points.
Key Considerations for Winter Application
Store in a cool, dry place (recommended shelf life: 6 months); protect from moisture and physical compression. Before use, ensure that the temperature of all dry powder components exceeds the ambient dew point.
Optimize the dosage of latex powder (avoid using insufficient amounts); consider incorporating antifreeze agents suitable for low-temperature conditions. Use water at a slightly elevated temperature (20°C–60°C) for mixing.
Ensure the ambient temperature at the dry-mix mortar construction site is ≥ 5°C. The substrate surface must be free of frost, ice, and standing water. The temperature of the mixed mortar batch must be ≥ 5°C. Avoid applying the mortar in excessively thick layers.
Implement thermal insulation measures (e.g., covering) to ensure the mortar cures at a temperature above freezing (recommended duration: at least 8 hours). Avoid using water-curing methods.
