Concrete Sidewalk

Concrete

Concrete is a composite material composed of aggregate bound together with a fluid cement that cures to a solid. It is the second-most-used substance, the most widely used building material, and the most-manufactured material in the world. Cement-bound concrete differs from the less rigid, less durable asphaltic concrete, which has a bituminous binder.

Sidewalk

A sidewalk, pavement or footpath is a footpath along the side of a road or street, designed primarily for pedestrians and low-speed personal transporters such as mobility scooters and postal NEVs. Sidewalks are usually paved by concrete, pavers, bricks, tiles, stones or asphalt, and are normally slightly elevated from the roadway and separated from motor vehicle lanes by a curb or gutter. There may also be a planted strip between the sidewalk and the roadway and between the roadway and the adjacent buildings, land lots and private properties.

concrete

Adjective

1. Real, actual, tangible.
2. Analogous to the categories of algebraic objects which category theory was created to generalize, in the sense of having objects which can be thought of as sets equipped with some additional structure. Formally, equipped with a faithful functor to the category of sets.

Noun

1. A building material created by mixing cement, water, and aggregate such as gravel and sand.
2. Such a material whose cement is Portland cement or a similar limestone derivative.

sidewalk

Noun

1. A paved footpath located at the side of a road, for the use of pedestrians.
2. Any paved footpath, even if not located at the side of a road.