ABSTRACT
This paper describes the possibility to reuse concrete waste produced by demolition of reinforced concrete structures as aggregate for concrete from the viewpoint of strength, drying shrinkage and weight loss. Concrete rubble obtained from the demolished buildings were crushed by various crushing machines to reuse as aggregate.
The strength, drying shrinkage and weight loss of recycled concrete were examined experimentally when the types and combinations of aggregate, water cement ratio, slump, curing method and so on were varied.
Drying shrinkage of recycled concrete which used concrete crushed aggregate showed larger value by 20-30% than conventional river sand-gravel concrete. But their general behaviors are similar to the conventional concrete, and recycled concrete seems to have no problem for their practical use. But as CS·CG concrete shows less strength and larger shrinkage and weight loss, water permeation is considered to be large.
Therefore in using CS·CG concrete practically, care should be taken.
