What is dry mortar additives？

Dry mortar additives are materials that are added to dry mortar mixtures to enhance their performance and properties. They can be used to improve the workability, durability, bonding, and setting time of the mortar, as well as to reduce shrinkage, cracking, and other forms of damage. There are many different types of dry mortar additives available, each with its own function and requirements.

1. Cellulose ethers Cellulose ethers are one of the most common types of dry mortar additives. They are water-soluble polymers derived from cellulose, which is a natural polymer found in plants. Cellulose ethers can be used to improve the workability, bonding, and water retention of the mortar, as well as to reduce cracking and shrinkage. They are particularly effective in cement-based mortars and can be used in a wide range of applications, including flooring, tiling, and plastering.
2. Redispersible polymer powders Redispersible polymer powders are another type of dry mortar additive. They are synthetic polymers that are added to dry mortar mixtures to improve their bonding, workability, and durability. Redispersible polymer powders are typically made from vinyl acetate-ethylene copolymers or acrylics and can be used in a wide range of applications, including masonry, flooring, and tiling.
3. Retarders Retarders are used to slow down the setting time of the mortar, allowing more time for the mortar to be worked with and shaped. They are particularly useful in hot and dry conditions, where the mortar can set too quickly. Retarders are typically made from organic acids or sugars and should be used in the correct amounts to avoid adversely affecting the strength or durability of the mortar.
4. Accelerators Accelerators are used to speed up the setting time of the mortar, allowing it to cure more quickly. They are particularly useful in cold and damp conditions, where the mortar can take longer to set. Accelerators are typically made from calcium chloride or other salts and should be used in the correct amounts to avoid adversely affecting the strength or durability of the mortar.
5. Air entrainers Air entrainers are used to create tiny air bubbles in the mortar, improving its workability and freeze-thaw resistance. They are particularly useful in regions with frequent freeze-thaw cycles, where the mortar can be damaged by water freezing and expanding within its pores. Air entrainers are typically made from surfactants or soaps and should be used in the correct amounts to avoid adversely affecting the strength or durability of the mortar.
6. Fillers Fillers are used to reduce the amount of binder needed in the mortar, improving its workability and reducing its cost. They are typically made from silica or other minerals and can be used in a wide range of applications, including masonry, flooring, and tiling.

Overall, dry mortar additives are an essential component of modern construction materials, providing a range of benefits and advantages that are essential for achieving optimal performance and results. By carefully selecting and dosing each additive in the mix, you can create mortars that are strong, durable, and suitable for your intended application.