The weather resistance of waterproof mortar is crucial
The weather resistance of waterproof mortar
The weather resistance of waterproof mortar is a critical performance indicator in practical applications. If it can withstand climatic erosion, extend the service life of buildings, enhance reliability and overall durability in complex environments, and reduce long-term maintenance costs, it is of great importance.
How can the weather resistance of waterproof mortar be enhanced? We offer the following suggestions:
1. Select high-quality inorganic binding materials. We recommend using Portland cement with a strength grade of 42.5 or higher. For waterproof mortar applied on the backwater side, we recommend using cement with a strength grade of 52.5 or higher.
2. Use high-quality sand, such as quartz sand or yellow sand, as these types of sand have better strength and resistance to weathering.
3. Add weather-resistant polysiloxane-based water-repellent agents, which offer more durable performance compared to calcium stearate or sodium/potassium methyl silicate-based water-repellent products.
4. Use cellulose ethers with high substitution degree and good water retention properties, and ensure the addition rate does not exceed 1‰. Cellulose ethers are hydrophilic materials; excessive addition may cause the film formed after mortar drying to re-dissolve upon contact with water, thereby impairing the waterproof mortar’s waterproofing performance.
5. Use high-temperature resistant dry powder defoamers, as some defoamers lose their defoaming and foam-inhibiting capabilities at high temperatures, thereby affecting the density of the waterproof mortar.
Similarly, high-quality polycarboxylic superplasticizer should be used to further ensure the density of the waterproof mortar.
