Abstract:
Conventional construction materials require the extraction of large quantities, causing
depletion of natural resources and environmental damage. This work investigates the
possibility of using bauxite mining waste as fine aggregate replacement for concrete
production. The experimental works were conducted by varying sand and bauxite mining
waste to mix ratio of 1:2:4 with five different replacement levels namely: 0%, 25%, 50%,
75% and 100% by weight and water cement ratio of 0.60. A total of sixty (60) cubes of
size 150mm x 150mm x150mm, sixty (60) cylinders having diameter of 150mm and height
of 300mm and sixty (60) beams of size 150 mm x 150 mm x 450 mm were cast and tested
in 7days, 14 days, 21 days and 28 days respectively. Tests conducted include workability,
density, compressive strength, tensile strength and flexural strength. It was found that the
bauxite mining waste composite mix was less workable to control mix. It was found that
the density of the bauxite mining waste produce achieved slightly higher results as the
quantity of bauxite mining waste increased, there was no statistical significant difference
among concrete produced. It was also found that the compressive strength, tensile strength
and flexural strength achieved good results as the quantity of bauxite mining waste
increased, there was statistical significant difference in the various mix proportions as the
quantity of bauxite mining waste increased. It was also found that there was positive
correlation between the density of the concrete produced and the compressive strength,
tensile strength and flexural strength. It is recommended that bauxite mining wastes are
suitable to use as fine aggregate replacement for concrete production in the areas where the
bauxite residues are deposited.
Description:
A Thesis in the Department of CONSTRUCTION AND WOOD TECHNOLOGY
EDUCATION, Faculty of TECHNICAL EDUCATION, submitted to the School of
Graduate Studies, University of Education, Winneba, in partial fulfillment of the
requirements for the award of the Master of Philosophy
(Construction Technology) degree
SEPTEMBER, 2018