Abstract:
Concrete is one of the most widely used construction materials in the world.it is a heterogeneous
composite material consisting of cement, water, fine aggregate, and coarse aggregates. The
binder of coarse aggregate and fine aggregate is cement. Now a day cost of cement is increased
day by day in developing countries like Ethiopia. So it needs development of cementitious
materials to replace cement in concrete production with locally available materials especially
with those considered as waste namely secondary aluminum dross and corn cob. Corn cob is an
agricultural waste product obtained from maize. Secondary aluminum dross is an industrial
waste obtained from the secondary aluminum factory. The present study is investigated concrete
utilizing secondary aluminum dross and corn cob ash as a partial replacement of cement. This
study was a new finding for replacement of cement by hybrid of secondary aluminum dross and
corn cob ash and checked its fresh and hardened properties of concrete. Cement has been
partially replaced by SAD-CCA in different proportions to study the property of fresh and
hardened properties of concrete. Four partial replacements 0%, 4%, 8%, and 12% of cement
with SAD-CCA have experimented at constant water-cement ratio of 0.52. twenty-four cube
samples of size 150mm×150mm×150mm, twenty-four cylinder samples of size 100mm diameter
and 200mm height, and twenty-four beam samples of size 100mm×100mm and length of 500mm
were molded and cured at ages of 7and 28 days. The study result revealed that the initial setting
time of SAD-CCA blended samples was found to rise with increasing percentage replacement
and decreasing final setting time with increasing percentage replacement. Also, the study
revealed that beyond 4% replacements with SAD-CCA, the compressive strength was reduced
and also flexural and tensile strength has been increased up to 8% when compared with control.
Workability of concrete was decreased with increasing percentage replacement of SAD-CCA.
The optimum replacement was found to be 4%. The compressive strength, tensile strength, and
flexural strength have been increased by 9.63%, 30.52%, and 19.14% respectively for 4% SAD CCA replacement in the concrete mix when compared with control concrete
