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Concrete admixtures are materials added to the concrete mix in small quantities to enhance specific properties of the concrete. The primary purpose of using admixtures is to modify the performance characteristics of the concrete, leading to improvements in workability, durability, and strength.

By incorporating admixtures, engineers can achieve better flowability and easier placement of the concrete, which is critical in complex castings and when working in challenging conditions. Additionally, certain admixtures can increase the strength of the concrete as it cures, often making the concrete more suitable for high-performance applications and environments where durability is essential.

While there are other applications for admixtures—such as adjusting setting times, modifying weight or appearance—enhancing the core properties of concrete is the most critical and common reason for their use in civil engineering. This makes them invaluable in meeting specific project requirements and improving the overall quality of the concrete.