Eggshell Powder and Waste Soda-Lime Glass Powder as a Partial Cement Replacement Material in Mortar
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Date
2026-02-01
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Addis Ababa University
Abstract
In current situation where the need for cement is scaling up and the world is wisely using waste materials in to useful products, this research proposes potential poultry and domestic
waste (Eggshell) and industrial and domestic waste (Soda-lime glass) as a partial cement replacing material for the construction industry.
The eggshell samples were collected from Mojo and the soda-lime glass where collected from households then grinded until all the particles passed 150 µm sieve and then their chemical properties were investigated. From the complete silicate analysis test result it is found that eggshell is reach in calcium oxide or lime and soda-lime glass is reach in silica. And the XRD
test result showed, the eggshell has 47.87% crystalline and 52.13% amorphous property and the soda-lime glass has pure amorphous property.
For the flow and compressive strength test a total of 414 mortar cubes were utilized. The mortar cubes were done by replacing OPC with eggshell powder and soda-lime glass powder
in 23 different mixes according to the ASTM using 0.485 water to cement ratio and 1:2.75 cement to sand content.
The property of mixes at fresh state showed that, workability increases as ESP and SLGP increases. The results of mortar at hardened state also showed that, 2.5%SLGP + 7.5%ESP,
5% SLGP + 5%ESP, 7.5%SLGP + 2.5%ESP and 10% SLGP replacement with OPC have applicable compressive strength value relative to the control sample throughout the tests
period i.e. 7, 28 and 56 days curing in 20°c. The result also shows 2.5%SLGP + 7.5%ESP, 5% SLGP + 5%ESP, 7.5%SLGP + 2.5%ESP and 10% SLGP replacement with OPC have
applicable compressive strength value relative to the control sample throughout the tests period i.e. 7 and 28 days curing in 60°c. However the control still shows higher value at 56
days curing in 60°c. Even if the control tends to have a higher compressive strength at later age, 2.5%SLGP + 7.5%ESP, 5% SLGP + 5%ESP, 7.5%SLGP + 2.5%ESP and 10% SLGP
replacements could be used as an optimum mix.
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Keywords
Eggshell powder, soda-lime glass powder, mortar, workability, compressive strength