The lightweight concrete has dry density between 800 and 2000 kg/m³. The technical down boundary of the light concrete density is about 350 kg/m³.
The low weight of lightweight concrete is due to aggregates of high porosity and low density. Apart from aggregates and concrete, additional air pores are involved. These air pores give light heat-insulating properties to the concrete and lower thermal conductivity.
The most commonly used aggregates in the production of lightweight concrete are expanded vermiculite and perlite.