Which of the following is NOT a component of concrete?

Concrete is a composite material primarily made up of specific components that contribute to its structural integrity and performance. The three essential components of concrete are cement, sand (fine aggregate), and water.

Cement acts as the binding agent that holds the other components together once it hydrates. Sand is used as fine aggregate, providing bulk and contributing to the overall strength and stability of the concrete mix. Water is crucial for the hydration process of the cement, allowing it to harden and develop strength.

Agglomerate, on the other hand, is not a standard term associated with concrete materials. It may refer to clumps or clusters of particles but is not recognized as a fundamental component in the composition of concrete mixes. Therefore, identifying agglomerate as not being a component of concrete is correct, as the fundamental constituents that make up concrete are cement, sand, and water.