Concrete

Concrete is a composite construction material composed primarily of aggregate, cement and water. Concrete is widely used for making architectural structures, foundations, brick/block walls, pavements, bridges/overpasses, motorways/roads, runways, parking structures, dams, pools/reservoirs, pipes, footings for gates, fences and poles and even boats
 * Concrete:**

Reinforced concrete can encompass many types of structures and components, including slabs, walls, beams, columns, foundations, frames and more. Reinforced concrete can be classified as precast or cast in-situ concrete.
 * Reinforced concrete:**

Most concrete shell structures are buildings, including storage facilities, commercial buildings, and residential homes. Concrete shell construction techniques are well suited for complex curves and are also used to build boat hulls (called ferroconcrete)
 * Concrete-shell construction**:



Precast concrete is a construction product produced by casting concrete in a reusable mold or "form" which is then cured in a controlled environment, transported to the construction site and lifted into place. In contrast, standard concrete is poured into site-specific forms and cured on site
 * Precast-concrete construction:**

Prestressed concrete is a method for overcoming concrete's natural weakness in tension. It can be used to produce beams, floors or bridges with a longer span than is practical with ordinary reinforced concrete.
 * Prestressed concrete:**