Yes, concrete is considered a compound material. It is primarily made up of aggregates (such as sand and gravel), cement, water, and sometimes additives. When mixed together, these components undergo a chemical reaction called hydration, which hardens the mixture and gives concrete its strength.
The aggregates provide bulk and strength, while the cement serves as the binding agent that holds everything together. The water is essential for the chemical reaction and to achieve the right consistency during mixing. The combination of all these ingredients creates a new material with properties that are different from the individual components, thus classifying concrete as a compound.