Which property is NOT associated with concrete?

Concrete is a widely used construction material characterized by several notable properties. It is recognized for its durability, making it an ideal choice for structures that need to withstand various environmental conditions and load-bearing requirements. Concrete is also classified as an inorganic material, which means it does not consist of carbon-based compounds and is derived from natural mineral sources.

Moreover, concrete is renowned for its hardness, providing the strength necessary to support structures such as buildings, bridges, and roads. The hardness of concrete is a key factor in its ability to bear heavy loads and resist wear and tear from various influences.

The property attributed to concrete that is not accurate is its flexibility. Concrete is known for being rigid when set, meaning it does not bend or flex easily without cracking or breaking. This lack of flexibility is one of the reasons why reinforcing materials like steel rebar are often added to concrete in construction to handle tensile stresses and improve overall structural integrity.

Thus, the claim that concrete is flexible misrepresents its fundamental nature, as its rigidity and strength are primary characteristics that define its use in construction.