Investigating Properties of Fresh and Hardened Self- Compacting Concrete Made of Recycled Aggregates

Self-compacting concrete is a new high-performance concrete with high ductility and segregation resistance. In recent years, construction material manufacturers have focused their attention on lightweight concrete and have strived to use lightweight concrete, if possible, in load-bearing parts of buildings. Concrete with both self-compacting and lightweight properties is favorable in this context which is the so-called lightweight self-compacting concrete. Because of increasing on the number of construction materials resulting from destruction of different buildings, production of self-compacting concrete with these materials is justifiable in terms of costs, environmental protection, and energy conservation. Accordingly, coordination between self-compacting factor and utilizing these materials is important. So, in this research, the effect of recycled aggregates on mechanical properties of lightweight self-compacting concrete was investigated. Specimens were analyzed using 16 mix designs by Slump, J-Ring, and compressive strength tests. Results indicated that mix designs containing recycled LECA have good consistency and stability. Also, mix designs containing recycled scoria have high strength. Hence, in order to achieve self-compacting and lightweight properties, it seems logical to use those two recycled materials.