Cement-based composites are materials that combine cement with other components to enhance their properties. These composites often include additives like fibers, polymers, or aggregates to improve strength, durability, and resistance to environmental factors. They are widely used in construction for applications such as concrete, mortar, and grouts. The use of cement-based composites allows for greater flexibility in design and performance. By adjusting the mix of materials, engineers can create composites tailored for specific needs, such as high-performance concrete for bridges or self-healing concrete that can repair its own cracks.