This study was conducted to solve the technical problem for utilizing recycled concrete aggregate of nuclear power facilities.
Waste concrete was crushed by using three kinds of crushers with different crushing mechanism followed by Jaw crusher's prior crushing. Test results of these crushed aggregate showed that the type of crusher and the number of crushing process did not affect the properties of crushed aggregate.
Though recycled concrete showed relatively lower mechanical properties than conventional concrete, the difference was confirmed to be so slight to apply for practical use.
As for durability of the concrete, recycled concrete has sufficient resistance to freezing and thawing, watertightness and less carbonation. However, higher drying shrinkage than conventional concrete was considered to take some countermeasure to reduce cracking of concrete.
Development of curshing mechanism of recycled aggregate and method for reducing drying shrinkage of recycled concrete were proposed by the results of the study.
