This article is about the philosophical term . For the construction material , see Concrete. For the comic book, see Concrete (comics).
In philosophy, a concept is considered concrete if it is not abstract: it must be both particular and an individual, and hence occupy both space and time. To say that a physical object is concrete is to say, approximately, that it is a particular individual that is located at a particular place and time.
Science generally deals with concrete objects; the laws of physics which apply to such things as planets and atoms don't apply to justice or mathematics.
Concrete entities have mass and electric charge and other such physical features, but unlike abstractions they do not have a truth-value; a rock is not true or false, it is either existent or non-existent, and this state will depend upon circumstances such as place and time.
Concrete is most often constructed with the addition of steel bar or fiber reinforcement.
Concrete can also be prestressed (reducing tensile stress) using steel cables, allowing for beams or slabs with a longer span than is practical with reinforced concrete.
Here a concrete truck is feeding concrete to a concrete pumper, which is pumping it to where a slab is being poured.
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