Development of Practical Use of Recycled Aggregate for Concrete

2006 Fiscal Year Final Research Report Summary

• Project/Area Number: 17560416
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: Setsunan University
• Principal Investigator: YAMURA Kiyoshi Setsunan University, Faculty of Engineering, Professor, 工学部, 教授 (30026257)
• Co-Investigator(Kenkyū-buntansha): ZUI Hiroshi Setsunan University, Faculty of Engineering, Professor, 工学部, 教授 (30236062) ; KUMANO Tomozi Setsunan University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (40340856)
• Project Period (FY): 2005 – 2006
• Keywords: Recycled Aggregate / Recycled Concrete / Strength / Durability / Carbonation / Rust of Steel Bar / 鉄筋腐食

Research Abstract

In this study, to spread the practical use of recycled aggregate made from demolition waste concrete, the properties of recycled aggregates (both fine and coarse) made from the demolition waste concrete stored in temporary stock yards for construction waste materials and concretes containing these recycled aggregates were investigated. Main results obtained are as follows.
1. Compressive strength and durability of concrete containing recycled aggregate are worse compared normal aggregate concrete. And the amount of these range are affected by the quality of recycled fine aggregate.
2. Speed of carbonation of recycled concrete by accelerated test are higher than that of normal concrete. And the rates of rust of steel bar in the recycled concrete are larger than the case in the normal aggregate concrete by accelerated test.
3. These deterioration properties of recycled concrete can be recovered by adjusting the water cement ratio of concrete in the case that high quality recycled fine aggregate is used.