Claim: There are many types of concrete including foam concrete that has dry density between 400 and 1600 kg.
Evidence: Foamed concrete can be produced with dry densities of 400 to 1600 kg/m (25 lb/ft to 100 lb/ft), with 7-day strengths of approximately 1 to 10 N/mm (145 to 1450 psi) respectively. Many other non-cementitious types of concrete exist with other methods of binding aggregate together, including asphalt concrete with a bitumen binder, which is frequently used for road surfaces, and polymer concretes that use polymers as a binder.