Assessing the Effect of Partial Replacement of Coarse Aggregate in Concrete with Recycled Plastic-Waste Palates
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Date
2018-08
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Kampala International University, School of engineering and applied science, department of civil enginering
Abstract
The project was toassessing the effect of partial replacement of coarse aggregates in concrete
used in suspended slabs with recycled plastic-waste palates. The properties of concrete
studied include both fresh and hardened properties. The independent variable in this project
is the partial replacement of course aggregate with plastic palates. The dependent variable in
this case are the properties of concrete such as workability, compressive strength and the
weight of the cubes at different percentage replacement. Since it was a partial replacement,
the replacement of coarse aggregates with plastic palate was from 0% to 75%. The results
of the project were as follows. The average weight of concrete cubes at 28days was 7.894Kg
for 0% replacement and 5.904Kg for 75% replacement of coarse aggregates with the plastic
waste palates. The decrease in the weight of the concrete with the increase in the replacement
of the coarse aggregates with plastic waste palates could have been due to the fact that the
plastic palates were not as heavy as the natural course aggregate. The workability of the
concrete was 50mm at 0%, 53mm at 25%, 56mm at 50% and 60mm at 75% replacement of
coarse aggregates with plastic palate.The results showed an increase in slump with the
increase the replacement of coarse aggregates with plastic palate which could be due to the
fact that plastic waste palates had less or no absorption of water in the concrete mix which
increased the water content in the mix that resulted into a high workability. The plot
compressive strength against plastic percentage replacement shows steady decrease in
compressive strength between 0 and 50% and later drastically decreases with increase in
plastic replacement. This could have been due to the fact that in the process of preparing the
plastic palate aggregate, the palates were cut with shape and smooth which hindered the
adequate bonding with the other concrete constituents hence lowering the compressive
strength.The plastic percentage of 50% with compressive strength of 11.2kN/mm2and weight
of 6.370Kg is our optimum percentage replacement of course aggregates with plastic waste
palates because the weight had reduced but the compressive strength was not so much
compromised
Description
Final Year Project Report Submitted to Kampala International University in Partial Fulfillment of the Requirement of the Award of a Degree of Bachelor of Science in Civil Engineering
Keywords
Effect of Partial Replacement of Coarse Aggregate in Concrete with Recycled Plastic-Waste Palates