This guide applies to all cellular concretes which weigh more than 50 pcf (800 kg/m3) oven-dry and also to aggregate concretes which weigh more than 50 pcf (800 kg/m3) oven-dry but have a compressive strength less than 2500 psi (175 kgf/cm2). Lightweight aggregate concretes of higher strength are@ by definition@ within the scope of ACI Committee 213@ Lightweight Aggregates and Lightweight Aggregate Concrete. Both precast and cast-in-place concretes are within the scope of this guide.