TITLE:
Concrete Based on Recycled Aggregates for Their Use in Construction: Case of Goma (DRC)
AUTHORS:
Masika Muhiwa Grâce, Alinabiwe Nyamuhanga Ally, Muhindo Wa Muhindo Abdias, Kubuya Binwa Patient, Muhatikani Trésor, Manjia Marcelline Blanche, Ngapgue Francois
KEYWORDS:
Demolition, Recycling, Water Absorption, Concrete, Mechanic Resistance
JOURNAL NAME:
Open Journal of Civil Engineering,
Vol.10 No.3,
August
3,
2020
ABSTRACT: The following study is aimed at valorizing an important part of waste
from building demolition, particularly concrete as a source of aggregates for
their usage in new hydraulic concrete
formulation. The experimental study mainly consisted of physical
characterization of natural and recycled aggregates respectively and the impact
of the latter on some properties of the new formulated concrete, actually their
respective consistencies for fresh concrete and mechanical strength for the
hardened one. The outcome of the study shows that the recycled aggregates are more
heterogeneous and have a high capacity of water absorption, but which still
respects the current standards of concrete. The
need for additional water has been observed for recycled aggregates-based
concrete so as to have the same workability. About the compressive strength,
mechanical properties obviously show that, at 28 days from setting up,
concretes from recycled aggregates can reach compressive strengths range
between 20 and 25 MPa without any sophisticated technology. So, these results show that we can
efficiently contribute to the protection of environment by valorizing waste
from concrete-based building demolition on the one hand; and the preservation
of natural reserve on the other. And both advantages contribute to sustainable
development overall goals.