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Air-entrained concrete contains billions of microscopic air cells per cubic foot.

These air pockets relieve internal pressure on the concrete by providing tiny chambers for water to expand into when it freezes.

A mix is then designed using cement (Portland or other cementitious material), coarse and fine aggregates, water and chemical admixtures.

The method of mixing will also be specified, as well as conditions that it may be used in.

Famous concrete structures include the Hoover Dam, the Panama Canal, and the Roman Pantheon.

The earliest large-scale users of concrete technology were the ancient Romans, and concrete was widely used in the Roman Empire.

It can be also categorized as high performance concrete as the ingredients are the same, but in this type of concrete workability is increased.

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.

These ingredients are mixed with water to create concrete which is used as a primary construction material in buildings.

These cement and concrete standards allow laboratories all over the world to test and evaluate concrete mixtures to ensure their strength and safety.