Lean Concrete Using the Site-crushed Recycled Aggregates

현장파쇄 재생골재 활용 빈배합 콘크리트

To select the proper material for lean concrete, the recycled aggregates produced by 3 crushers, such as jaw, impact and mill-treated, were investigated for the gradation and the compaction, and strength of concrete made of them. The experiments for all the recycled aggregates used, showed that the cylinders made of them had 7-day compressive strengths over 50kgf/$cm_2$, the provision of qualification, and the OMCs are in the range 5.7% to 6.8%. Also, the unit cement contents for the impact-crushed are 158kg/$cm_2$.