Author
Eng. Abdirahman Ismail Dhaqane, Dean, Faculty of Engineering, Mogadishu University
An Experimental Study on: Recycling of Demolished Concrete in Mogadishu City
Abstract
In Somalia, appropriate in imitation of the booming on real zemindary business, many mean upward push constructions are demolished for substitute by incredibly high rise building, also due in conformity with the corrosion over embodied structures, deep old structures are essential in accordance with shatter and substitute by using new buildings. The demand for virgin aggregate for construction can be reduced by recycling of demolished concrete as course in new construction work. Therefore, this study was carried out to check the possibility of using demolished concrete as coarse aggregate for new constructions. Concrete blocks from 10 building sites were collected and crushed into coarse aggregate which is defined as recycled aggregate.
The recycled aggregates were investigated for unit weight, absorption capacity, and compressive strength. The results were compared with virgin aggregate. The wear value (abrasion value) of recycled aggregates is higher than the normal aggregates due to the presences of adhering mortar portion with the recycled aggregates. The absorption of recycled aggregates is also higher compared to the normal aggregates.
For the same W/C, the strength and Young’s modulus of recycled aggregate concrete are lower than the same (particularly W/C= 0.55).
The workability of recycled aggregate concrete is lower than the corresponding normal aggregate concrete. If the W/C is reduced compared to the normal aggregate concrete, recycled aggregate concrete
gives higher strength compared to the same of normal aggregate concrete made with a higher W/C.
