Resistance to Chloride Penetration of Mortar Using Eggshell as a Partial Replacement of Sand
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Date
2024-06
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Addis Ababa University
Abstract
Concrete became more in demand as the building sector grew. Which leads to ongoing
quarrying and causes the depletion of natural resources due to excessive mining of natural
sand. Also the increase in demand and consumption of egg leads to waste production which
will impact the environment. Utilizing of waste materials will reduces the need for natural
aggregate, energy, and environmental damage. This study explores the possibility of
substituting sand partially with eggshell in mortar production, with a focus on its effects on
compressive strength, flexural strength, and chloride penetration resistance. Eggshells, a
readily available waste material, offer a sustainable alternative to traditional sand, addressing
both environmental and resource depletion concerns. Mortar samples with varying
percentages of eggshell powder replacing sand (0%, 10%, 20%, 25%, and 30%) were
prepared and subjected to standard testing procedures. The experimental results indicate a
decrease in both compressive and flexural strengths with the inclusion of eggshell, compared
to control samples. Specifically, the compressive strength decreased by up to 16%, 38% 44%
and 49% with 10%, 20%, 25%, and 30% replacement respectively the flexural strength saw a
reduction of up to 7.8%, 22%, 31% and 43% with 10%, 20%, 25%, and 30% replacement
respectively. Despite these reductions in mechanical properties, a replacement up to 5% is
acceptable. For flexural strength 25% is acceptable. The resistance to chloride penetration
increases as the percentage of eggshell increases with 0% and 10% replacement showing
similar results and 30% showed the highest increase in chloride penetration. And also, there
is a decrease in the density of mortar samples with eggshell than the controlled samples
because of the light weight of eggshell which can be used for redaction of the overall weight
of the structure.
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Keywords
eggshell, fine aggregate, compressive strength, flexural strength, chloride penetration resistance, mortar.