What are admixtures used for in concrete?

Admixtures are substances added to concrete during the mixing process to modify its properties, enhancing its performance and functionality for specific applications. These can include improving workability, increasing strength, reducing water demand, accelerating or retarding setting times, and providing resistance to harsh environmental conditions. By using admixtures, engineers can tailor the concrete mixture to meet the unique requirements of different construction projects, ensuring optimal performance and longevity.

While enhancing color might be one potential use of certain admixtures, this is not their primary purpose. The reduction of initial material costs and compliance with building codes are not direct uses of admixtures either, as they primarily focus on altering the physical and chemical characteristics of the concrete rather than cost or regulatory compliance.