Compound dry mix additives are ingredients that are added to dry mix formulations, such as concrete or mortar, to improve their performance and properties. These additives can include a variety of materials such as polymers, accelerators, retarders, air entraining agents, and water reducers.
Polymers are often added to improve the adhesion, durability, and flexibility of the mix. Accelerators are used to speed up the setting and hardening of the mix, while retarders slow down the setting process. Air entraining agents are added to create microscopic air bubbles in the mix, which improves its workability, freeze-thaw resistance, and durability. Water reducers are used to reduce the amount of water needed in the mix, which can improve its strength and durability.
The specific types and amounts of additives used will depend on the desired properties of the final product, as well as the materials used in the mix. Careful selection and proper use of these additives can help to improve the performance and longevity of dry mix products.
In addition to the additives mentioned above, there are also other types of compound dry mix additives that can be used. For example, silica fume is a fine-grain material that can be added to concrete mixes to improve its strength, durability, and resistance to chemical attack. Fly ash, a byproduct of coal-fired power plants, can also be used as a replacement for some of the cement in concrete mixes, which can reduce the environmental impact of the mix while improving its strength and durability.
Another common additive is plasticizers, which are used to improve the workability and flow of concrete mixes, making them easier to handle and place. These can be either water-reducing or non-water-reducing plasticizers, depending on whether they also reduce the amount of water needed in the mix.
In summary, compound dry mix additives can greatly enhance the properties of dry mix formulations such as concrete and mortar. By carefully selecting and using the appropriate additives, the performance, durability, and workability of these materials can be greatly improved, resulting in a higher quality end product.