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Concrete 1

Concrete is a composite material made of cement and aggregates bonded together. It is most commonly made from Portland cement mixed with water, sand, and gravel. When cured, concrete hardens and can be used for construction purposes such as buildings, roads, and structures.

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21 views1 page

Concrete 1

Concrete is a composite material made of cement and aggregates bonded together. It is most commonly made from Portland cement mixed with water, sand, and gravel. When cured, concrete hardens and can be used for construction purposes such as buildings, roads, and structures.

Uploaded by

Vicces P. Estrada
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Concrete

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This article is about the construction material. For other uses, see Concrete (disambiguation).

Not to be confused with cement or mortar (masonry).

Exterior of the Roman Pantheon, finished 128 AD, the largest unreinforced concrete dome in the
world.[1]

Interior of the Pantheon dome, seen from beneath. The concrete for the coffered dome was laid on
moulds, probably mounted on temporary scaffolding.

Opus caementicium exposed in a characteristic Roman arch. In contrast to modern concrete structures,
the concrete used in Roman buildings was usually covered with brick or stone.

Concrete is a composite material composed of fine and coarse aggregate bonded together with a fluid
cement (cement paste) that hardens over time. Most concretes used are lime-based concretes such as
Portland cement concrete or concretes made with other hydraulic cements, such as calcium aluminate
cements. However, asphalt concrete, which is frequently used for road surfaces, is also a type of
concrete, where the cement material is bitumen, and polymer concretes are sometimes used where the
cementing material is a polymer.

When aggregate is mixed together with dry Portland cement and water, the mixture forms a fluid slurry
that is easily poured and molded into shape. The cement reacts chemically with the water and other
ingredients to form a hard matrix that binds the materials together into a durable stone-like material
that has many uses.[2] Often, additives (such as pozzolans or superplasticizers) are included in the
mixture to improve the physical properties of the wet mix or the finished material. Most concrete is
poured with reinforcing materials (such as rebar) embedded to provide tensile strength, yielding
reinforced concrete.

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