What is the primary composition of concrete?

The primary composition of concrete is indeed cement, water, and aggregate. Cement acts as the binding agent that holds the entire mixture together, while water is crucial for the hydration process, allowing the cement to cure and gain strength. Aggregate, which includes sand, gravel, or crushed stone, provides bulk and structure to the concrete, contributing significantly to its strength and stability.

This combination is fundamental in the field of construction and structural engineering, as the proportions of each component can significantly affect the properties of the concrete, including its workability, durability, and strength. Understanding this composition is essential for any structural collapse rescue technician, as it relates directly to the stability and integrity of structures during rescue operations. Other combinations listed in the options do not accurately represent the standard formulation of concrete, which is primarily recognized as the triad of cement, water, and aggregate.