Concrete

Psychologically:

The symbol for a hardened character – “the character armor,” according to the teachings of Wilhelm Reich. In general, concrete stands for hardness, coldness and emotional boundaries.

Explanation & Definition:

Short explanation
A building material created by mixing Portland cement, water, and aggregate including gravel and sand.

Complete definition
Concrete is a composite construction material composed primarily of aggregate, cement and water. There are many formulations that have varied properties. The aggregate is generally a coarse gravel or crushed rocks such as limestone, or granite, along with a fine aggregate such as sand. The cement, commonly Portland cement, and other cementitious materials such as fly ash and slag cement, serve as a binder for the aggregate. Various chemical admixtures are also added to achieve varied properties. Water is then mixed with this dry composite which enables it to be shaped (typically poured) and then solidified and hardened into rock-hard strength through a chemical process known as hydration. The water reacts with the cement which bonds the other components together, eventually creating a robust stone-like material. Concrete has relatively high compressive strength, but much lower tensile strength. For this reason is usually reinforced with materials that are strong in tension (often steel). Concrete can be damaged by many processes, such as the freezing of trapped water.

Synonyms of concrete
adjective: tangible, real, actual, specific; verb: solidify; noun: beton, cement; plural: betons, cements; related terms: building material, cement, ferroconcrete, reinforced concrete, paving, paving material, pavement, sand.