There are many types of concrete including foam concrete, also known as lightweight concrete, that has dry density between 400 and 1600 kg.
The use of recycled glass as aggregate in concrete has become popular in modern times, with large scale research being carried out at Columbia University in New York. Strictly speaking, asphalt is a form of concrete as well, with bituminous materials replacing cement as the binder. Aerated concrete produced by the addition of an air-entraining agent to the concrete (or a lightweight aggregate such as expanded clay aggregate or cork granules and vermiculite) is sometimes called cellular concrete, lightweight aerated concrete, variable density concrete, Foam Concrete and lightweight or ultra-lightweight concrete, not to be confused with aerated autoclaved concrete, which is manufactured off-site using an entirely different method. It is also called aircrete, foamed concrete, foamcrete, cellular lightweight concrete or reduced density concrete. Properties of Foamed Concrete 400 600 800 1000 1200 1400 1600 
