Abstract: A low density non-shrinking concrete possessed of high strength and favorable insulation properties. The concrete manufacturing process includes the steps of providing a body of cured cellular concrete, breaking the body into fragments, coating the cellular concrete fragments with a thin layer of cement which is allowed to cure, and incorporating the coated fragments in a cement matrix to form the low density concrete. The cellular concrete fragments are preferably tumbled to remove sharp corners prior to the coating operation. The tumbling and coating operations are preferably carried out on fragments that have been classified into groups of related sizes. The concrete in the ultimate mix avoids the shrinkage problems normally associated with cellular concrete, and is therefore suitable for use in cast building slabs and panels or as the core material in composite building elements.

Abstract: A low density non-shrinking concrete possessed of high strength and favorable insulation properties. The concrete manufacturing process includes the steps of providing a body of cured cellular concrete, breaking the body into fragments, coating the cellular concrete fragments with a thin layer of cement which is allowed to cure, and incorporating the coated fragments in a cement matrix to form the low density concrete. The cellular concrete fragments are preferably tumbled to remove sharp corners prior to the coating operation. The tumbling and coating operations are preferably carried out on fragments that have been classified into groups of related sizes. The concrete in the ultimate mix avoids the shrinkage problems normally associated with cellular concrete, and is therefore suitable for use in cast building slabs and panels or as the core material in composite building elements.