ABSTRACT OF GRADUATION THESIS
TITLE: Flexural Strength of Concrete Beams using Fine
Aggregates from Demolished Concrete Waste.
Name: Furqan Ahmed
Supervisor: Mehboob Oad
Thesis: Bachelor’s Graduation Thesis
Date of Submission: 25/11/21
Concrete has been proved to be a leading construction material all over the world.
Due to demand of new structures, new construction is increasing day by day. This
rapid demand of structures has increased the requirement of concrete. New structures
are being constructed and old structures are being demolished. This results in the
generation of construction waste at a large scale. The throwing away of this huge
mass of construction waste has happen to a major social and green issue all around
the world, mostly in developing countries. Therefore, a proper utilization of
demolished waste is important in order to deal with this waste and have an alternate
material for utilization in concrete.
In this connection an experimental study has been carried out to utilize the waste as
recycled fine aggregates to partially replace natural fine aggregates. 18 concrete
beams of 4x4x18 size with 1:2:4 mix, and 0.5 water cement ratio were prepared in
06 batches of 0%, 20%, 40%, 60%, 80% and 100% replacement of recycled concrete
as fine aggregates. Specimens were than cured for and 28 days. The results of
following tests are reported: gradation of aggregate, specific gravity, water
absorption, slump test, and flexural strength. The results are presented in both tabular
and graphical format to compare with reference concrete. From the results, it is
observed that the strength properties of concrete decrease as recycled fine aggregate
increase. However, the approach can effectively be used in various structural
applications
for
replacement
ratio
up
to
40%.
i
Figure 1: Concrete specimen under testing
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