How did concrete change over time?

Concrete has evolved significantly since its early use by ancient civilizations like the Romans, who utilized volcanic ash to improve its durability. Modern advancements introduced stronger materials, such as Portland cement, and the incorporation of additives that enhance its properties, like resistance to weathering and increased workability. The development of reinforced concrete, which combines steel and concrete, revolutionized construction by allowing for taller and more durable structures. Today, sustainable practices and new technologies, such as 3D printing, continue to shape the future of concrete.