Lightweight Aggregate Concrete

Lightweight concrete blocks and in-situ concrete are discussed in Chapters 2 and 3 respectively. Lightweight concrete materials offer a range of insulating and load-bearing properties, starting from 0.10 W/m K at a crushing strength of 2.8 MPa. Resistance to airborne sound in masonry walls is closely related to the mass of the wall. However, any unfilled mortar joints which create air paths will allow significant leakage of sound. In cavity walls again mass is significant, but additionally to reduce sound transmissions the two leaves should be physically isolated, with the exception of any necessary wall ties, to comply with the Building Regulations.

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