A multilayer lightweight concrete slab

摘要

A multilayer lightweight concrete slab (10) comprises three layers wherein the intermediate layer (35) is less dense than the outer layers (30,40). The outer layers (30,40) may pre-stressed and all three layers may be tied together. The intermediate layer may comprise foamed concrete and the slab may comprise further layers. The slab is suitable for flooring and walling applications and may be extruded.