ABSTRACT
This paper describes the experiments carried out to determine the physical properties of preplaced aggregate concrete made from demolished concrete of 200mm maximum size.
First, the characteristics of strength were compared between concrete made from demolished concrete aggregate and concrete made from crushed stone.
Second, 40-200mm demolished concrete aggregate was divided into four gradings according to the fragment size and cast into specimen of ϕ600mm × h1200mm cylinder with grout mortar. The compressive strength of concrete made from all these gradings was determined. Enough compressive strength, 15-29MPa, was found for structural concrete.
Third, grouting experiments were conducted with 40-200mm demolished concrete aggregate. Flow gradient of grout mortar and compressive strength of mortar cores were determined.
Finally, effectiveness of preplaced aggregate concrete made from demolished concrete aggregate and applicability to structural concrete were suggested.
